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February 7 to February 13: This week in Denver weather history

February 7, 2016 Thornton Weather Leave a comment

You can tell how eventful a week in Denver weather history is by the length of these articles and this one is a long one for sure. In history we have seen Arctic cold, spring-like warmth, major snowstorms and blizzards and hurricane force winds. There is even a rare thunderstorm that dropped a bit of hail.

From the National Weather Service:

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In 1985…a cold front on the 29th produced a protracted cold spell as arctic air remained entrenched across metro Denver. While the only daily temperature record set was a low maximum reading of 2 degrees on February 3rd…minimum temperatures plunged well below zero on 9 consecutive days. The coldest readings were 15 degrees below zero on January 31st and 14 degrees below zero on February 5th.

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In 1963…warm weather that began with the strong Chinook winds on the 31st and 1st continued through the 8th. Maximum temperatures through the period ranged from 52 degrees on the 2nd to 76 degrees on the 5th…which was a new record high for that date.

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In 1899…a protracted cold spell lasted almost two weeks. Low temperatures plunged below zero on all days but February 9th with a reading of 6 degrees. The coldest low temperature of 22 degrees below zero on February 6th was a record low for the date. Low temperatures of 20 degrees below zero occurred on both February 11th and 12th… But only the 11th remains as the record minimum for the date. High temperature of only 5 degrees below zero on February 11th was a record low maximum for the date. High temperatures climbed to only zero degrees on both February 2nd and 3rd…but were not records. Intermittent light snow or flurries fell during the period. The most snowfall…2.0 inches…occurred on February 2nd.

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In 1883…a protracted cold period occurred when low temperatures dipped below zero for 9 consecutive days. Low temperatures ranged from 22 degrees below zero on the 4th to 2 degrees below zero on the 1st and 6th. High temperatures ranged from 10 below zero on the 3rd to 23 on the 9th. Several temperature records were set that still stand today. Record lows of 18 below and 22 below zero occurred on the 3rd and 4th. Record low maximum readings of 2 below and 10 below zero occurred on the 2nd and 3rd. The high of only 10 below zero on the 3rd is the coldest maximum temperature ever recorded in Denver.

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In 1978…the 5th marked the start of a record 7 consecutive days of dense fog at Stapleton International Airport. The heavy fog reduced the visibility to 1/4 mile or less for a period of time on each of these days. Light snow and/or freezing drizzle occurred on most days. Fog reducing visibility to less than 7 miles was recorded at Stapleton International Airport on 11 consecutive days through the 15th. During the period 5-14…the cold thick fog deposited heavy rime ice up to 5 inches thick on power lines and poles over a wide area of eastern Colorado…causing a major electrical power outage disaster.

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In 1929…5.0 inches of snow fell in downtown Denver behind a Canadian cold front. Temperatures plunged…but no records were set. Low readings dipped to 3 degrees below zero on the 6th and 9 degrees below zero on the 7th. Highs climbed to 5 degrees on the 6th and to only 1 degree below zero on the 7th.

In 1933…post-frontal light snowfall totaled 3.0 inches over downtown Denver. Northeast winds were sustained to 28 mph with gusts to 32 mph on the 6th. The very cold air mass plunged temperatures from a high of 60 degrees on the 5th to lows of 10 degrees below zero on the 6th and 16 degrees below on the 7th. High temperature of only 4 degrees below zero on the 7th was a record low maximum for the date.

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In 1933…3:00 pm on the 6th marked the start of a protracted cold period through 8:00 am on the 10th when the temperature was below zero for 86 out of 88 hours. The cold period was interrupted on the 8th at 9:00 am when the temperature was 1 degree above zero and at 10:00 am when the temperature was 8 degrees above zero. Four temperature records were set. High temperatures of 4 degrees below zero on the 7th…8 degrees on the 8th…and 5 degrees below zero on the 9th were record low maximums for those dates. The only record low temperature record was 14 degrees below zero on the 10th. The lowest temperature reached during the period was 16 degrees below zero on both the 7th and 8th…which were not records.

In 1940…a distant thunderstorm was recorded. This was only the second ever recorded in the city during February since 1900.

In 1976…strong Chinook winds were reported along the foothills with sustained winds at 46 mph and gusts to 69 mph at the National Center for Atmospheric Research in Boulder. Wind gusts of 70 to 90 mph were recorded at other locations in Boulder. Northwest winds gusted to 44 mph at Stapleton International Airport.

In 1979…strong west winds gusted as high as 99 mph near Boulder. The winds caused ground blizzards that closed several highways around Boulder. Some cars were forced off the road…and a truck was overturned. Wind gusts of 50 to 80 mph were common in and near the foothills. Northwest winds gusted to 33 mph at Stapleton International Airport.

In 1988…a wind gust to 82 mph was clocked at Rollinsville in the foothills southwest of Boulder.

In 1999…strong Chinook winds developed in the foothills. Peak wind reports included: 90 mph at the National Center for Atmospheric Research Mesa Lab near Boulder and 88 mph at Wondervu in the foothills southwest of Boulder. West to southwest winds gusted to only 48 mph at Denver International Airport.

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In 1936…a sharp blast of frigid arctic air was of short duration. At 11:00 am on the 7th the temperature was 39 degrees…but dropped to only 1 degree within an hour. A more gradual decrease occurred through the night to a low temperature of 25 degrees below zero shortly after 6:00 am on the 8th. This was the lowest temperature ever recorded in February. (the record was equaled on February 1…1951.) Snowfall of 1.0 inch occurred in the cold air. During the day on the 8th…northwest Chinook winds from 12 to 16 mph…and as high as 21 mph warmed the temperature to a high of 35 degrees at 7:00 pm. This was a rise in temperature of 60 degrees in 13 hours. Unofficially…the temperature dipped to a low of 30 degrees below zero at Denver municipal airport on the morning of the 8th.

In 1956…5.5 inches of snow fell at Stapleton Airport where east-northeast winds gusted to 23 mph on the 7th.

In 1980…an upslope storm dumped 4 to 10 inches of snow over the plains and as much as 22 inches in the foothills. Traffic was snarled and some schools were closed. Two runways were closed for 3 hours at Stapleton International Airport…where snowfall totaled 6.5 inches and north winds gusted to 25 mph. Most of the snow fell on the 7th.

In 1886…northwest winds were sustained to 40 mph in the city. The strong winds were accompanied by a cold wave.

In 1905…west winds were sustained to 40 mph behind a cold front. The Bora winds warmed the temperature to a high of only 38 degrees and produced a trace of snow.

In 1939…the very light snowfall…which began during the morning…contained unusually symmetrical…flat and dry snow crystals. These snow crystals continued to fall all afternoon. Snowfall was only a trace. Temperatures ranged from a low of 7 degrees to a high of 18 degrees.

In 1942…a major storm dumped 8.0 inches of heavy snow on downtown Denver. North winds were sustained to 17 mph.

In 1981…high winds occurred over the eastern foothills with 72 mph reported atop Squaw Mountain west of Denver and 60 to 70 mph winds at other locations in the foothills west of Denver. Wind gusts to 50 mph were reported in Boulder. Northwest winds gusted to 39 mph at Stapleton International Airport.

8-9

In 1898…rain changed rapidly to snow during the late evening of the 8th and continued through the early afternoon of the 9th. Snowfall totaled 6.0 inches in the city. Northeast winds were sustained to 26 mph with gusts to 30 mph on the 8th.
In 2001…heavy snow fell across metro Denver mainly in and near the eastern foothills. Snow totals included: 12 inches atop Crow Hill and near Evergreen; 10 inches in Evergreen and near Morrison; 9 inches at Genesee; 8 inches atop Lookout Mountain and near Littleton and Bailey; 6 inches at Arvada and Ken Caryl Ranch; and 5 inches in Broomfield…Chief Hosa… And Thornton. Snowfall totaled 5.1 inches at the site of the former Stapleton International Airport. Temperatures dipped to 15 degrees below zero at Denver International Airport on the morning of the 9th…setting a new record minimum for the date.

In 2002…high winds in the foothills on the 8th spread over the plains on the 9th and caused much blowing dust and snow and blizzard conditions east and northeast of metro Denver. I-70 was closed from just east of Denver to the Kansas state line. Zero visibilities coupled with snowpacked and slick roads caused multiple car accidents in southern weld County. High winds developed in the foothills on the 8th with gusts to 71 mph on Rocky Flats and to 75 mph at the National Center for Atmospheric Research mesa lab in Boulder. The high winds continued on the 9th with gusts to 83 mph near Fritz Peak…70 mph at Evergreen…and 67 mph at Parker. Northwest winds gusted to 55 mph on the 8th and to 58 mph on the 9th at Denver International Airport where the surface visibility was reduced to as low as 1 mile in blowing dust on the 9th.

In 2008…strong downslope winds developed in and near the Front Range foothills. Peak gusts included: 88 mph at Georgetown…85 mph at Berthoud pass…81 mph at the NCAR Mesa Lab…78 mph at the National Wind Technology Center… At 76 mph at Floyd Hill. At Denver International Airport… Gusty west winds to 48 mph were observed on the 8th.

Continue reading February 7 to February 13: This week in Denver weather history →

January 31 to February 6: This week in Denver weather history

January 31, 2016 Thornton Weather Leave a comment

Winds can be a blessing and a curse this time of year. Chinook winds can help warm what is otherwise a normally chilly season. They can also cause a great deal of damage as they pick up speed as they come roaring across the Front Range. While we have been lucky thus far this year and not had damaging wind events, looking back at this week in Denver weather history one can’t help but think that maybe it is just a matter of time before they strike.

26-1

In 1888…a protracted warm spell lasted a week. Maximum temperatures ranged from 62 degrees on the 29th to an all time record high for the month of 76 degrees on the 27th. Daily record high temperatures of 76…69…and 71 occurred on the 27th…28th…and 30th respectively. Record high minimum temperatures of 47 and 34 occurred on the 26th and 27th.

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In 1951…a major storm dumped 10.1 inches of snowfall at Stapleton Airport. Most of the snow…8.3 inches…fell on the 29th. Cold arctic air accompanied the snow. Several temperature records were set…including record low maximum temperatures of 4 on the 28th and 4 below zero on the 29th and record low temperatures of 12 below zero on the 29th and 24 below zero on the 31st. Temperatures were below zero for 45 consecutive hours.

29-31

In 1883…a major winter storm dumped 19.3 inches of snow on downtown Denver. Most of the snow…12.2 inches…fell on the 31st. This was the heaviest snowfall to hit the city in years. Temperatures plunged from a high of 52 degrees on the 29th to a low of 13 degrees on the 31st. Precipitation from the storm totaled 2.23 inches. The 1.22 inches of precipitation on the 31st was the greatest calendar day and 24 hour precipitation ever recorded in the city during the month of January.

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In 1908…an apparent strong cold front plunged temperatures 45 degrees in 24 hours from 47 degrees at noon on the 30th to only 2 degrees at noon on the 31st. North winds were sustained to 30 mph on the 30th. Snowfall was only 0.8 inch on the 31st.

In 1965…a major storm dumped 10.4 inches of snow over metro Denver. After 5 inches of snow fell in Boulder… Strong Chinook winds developed…warming the temperature 25 degrees in 90 minutes. Wind gusts to 97 mph were recorded on Table Mountain in Boulder. Winds gusts to 53 mph were measured in downtown Boulder where some damage occurred. Minor wind damage also occurred in western suburbs of Denver. West winds gusted to 51 mph at Stapleton International Airport on the 31st.

In 2005…a winter storm brought heavy snow to the Front Range foothills. Storm totals included: 17 inches at Aspen Springs…13 inches 7 miles southwest of Boulder and at Lake Eldora…12.5 inches near Blackhawk…11.5 inches at Rollinsville and near Nederland…11 inches near Evergreen and Golden and at Gross Reservoir…and 10 inches at Cabin Creek. Lesser amounts of snow fell over the city. Only 1.9 inches of snow were measured overnight at Denver Stapleton. North winds gusted to 30 mph at Denver International Airport…where freezing fog during the early morning of the 30th reduced the surface visibility to as low as 1/8 mile. Light rainfall… Rare in January…totaled 0.06 inch at Denver Stapleton on the early morning of the 30th.

30-7

In 1876…hurricane force winds caused some damage in Boulder.

In 1951…the low temperature plunged to 24 degrees below zero.

In 1933…snowfall was 0.2 inch in downtown Denver. This was the only measurable snowfall of the month and resulted in 0.01 inch of melted snow…the only measurable precipitation of the month.

In 1964…high winds blew down a sidewalk cover where a building was under construction…injuring a young woman. Three men were injured when a brick wall at a construction site toppled on them. All were treated for face…leg…and neck injuries. A west-northwest wind gust to 47 mph was recorded at Stapleton International Airport.

In 1969…high winds struck Boulder with gusts to 115 mph recorded at the National Center for Atmospheric Research and 83 mph in downtown Boulder. Schools were closed because of danger from flying debris. Some damage and minor injuries occurred. Northwest winds gusted to 35 mph at Stapleton International Airport.

In 1985…bitterly cold weather froze pipes and cars and forced some schools to close across metro Denver. Minimum temperatures dipped to as low as 15 below to 20 below zero across metro Denver. The low temperature was 15 below zero at Stapleton International Airport.
31-1

In 1963…high winds struck metro Denver. The strong Chinook winds reached 101 mph in Littleton…80 mph in Denver…and 90 mph at Rocky Flats. Among the hardest hit areas were Boulder where buildings under construction were blown down…porches and roofs blown off buildings…and power lines damaged. Damage totaled 100 thousand dollars in Boulder alone.

In other areas…utility lines were damaged and many signs…antennas…and road markers were blown down. At Stapleton Airport…west winds gusted to 44 mph on the 31st and 66 mph on the 1st. The Chinook winds warmed maximum temperatures to 65 degrees on the 31st and to 70 degrees on the 1st.

31-8

31-12

Intermittent light snow or flurries fell during the period. The most snowfall…2.0 inches…occurred on February 2nd.

In 1904…northwest winds were sustained to 51 mph with gusts to 60 mph. The Chinook winds warmed the temperature to a high of 55 degrees.

In 1907…west winds sustained to 42 mph warmed the temperature to a high of 59 degrees.

In 1932…the temperature rose from a low of 8 degrees at 7:00 am to the high of 58 degrees at 2:30 pm. The biggest jump occurred from 16 degrees at 8:00 am to 42 degrees at 9:10 am.

In 1951…the lowest recorded temperature in February…25 degrees below zero…occurred. The same temperature was also reached on February 8…1936.

In 1963…west-southwest winds gusted to 66 mph at Stapleton Airport where the strong Chinook winds warmed the temperature to a maximum of 70 degrees.

In 1970…snowfall of 0.3 inch contained only 0.01 inch of melted snow. This was the only measurable snow and precipitation for the month…making it the driest and least snowiest February on record. Snowfall also was only 0.3 inch on February 22-23…1992…equaling the least snowiest February.

In 1980…high winds occurred in the foothills. Wind gusts to 75 mph were reported at Wondervu. Northwest winds gusted to 32 mph at Stapleton International Airport.

In 1995…a short blast of early morning winds near the foothills produced a gust to 64 mph at Rocky Flats in northern Jefferson County. Winds gusting to 59 mph in Lakewood downed a few tree branches in residential areas. West winds gusted to 37 mph at Stapleton International Airport where the warm winds kept the temperature from falling below 43 degrees…setting a new record high minimum for the date. The temperature climbed to a non-record high of 63 degrees.

1-2

In 1934…light Chinook winds warmed temperatures to record levels on both days. Record maximum temperatures reached 73 degrees on the 1st and 74 degrees on the 2nd. West winds were sustained to 18 mph on the 1st.

1-3

In 1996…cold arctic air plunged temperatures below zero for more than 35 consecutive hours from late on the 1st until sunrise on the 3rd. The temperature warmed to only 1 degree below zero on the 2nd after a record low of 16 degrees below zero.

1-4

In 2011…a frigid arctic airmass settled into Front Range urban corridor. At Denver International Airport… Overnight low temperatures…from the 1st to the 3rd… Were 13 below zero…17 below zero and zero respectively. The icy temperatures caused pipes to crack and burst following the freeze. In Loveland…firefighters responded to more than a dozen water pipe breaks…most in fire sprinkler systems at businesses…apartments and assisted care facilities. At CU Earth Science Library in Boulder…more than 1000 books and several costumes for an upcoming production were damaged. At the county courts administration building in Jefferson County…a steady stream of water from a crack on the 5th floor… Went unnoticed on the 3rd and flooded all the floors of the administration wing overnight. As a result…much of the office equipment…furniture and carpet sustained water damage. A burst sprinkler line caused minor damage at the Platte Valley Medical Center in Brighton. The icy temperatures forced to closure of several school districts as well.

1-5

In 1985…the most bitter cold spell of the winter season brought sub-zero temperatures to metro Denver. Daily low temperature records were broken at Denver. The usual cold weather problems struck including stalled vehicles…jammed traffic lights…and frozen water and sewer lines. At Stapleton International Airport…the high temperature was only 2 degrees above zero on the 1st…setting a record low maximum for the date. Low temperatures reached 13 below zero on the 1st…12 below on the third…and 14 below on the 5th.

1-6

In 1989…one of the century’s worst doses of winter weather ravaged the entire state. Bitterly frigid weather moved into metro Denver on the 1st as snow buried many sections of the state.

In metro Denver where 3 to 6 inches of snow fell…blowing snow and resultant poor visibilities caused a 46-car pile-up on I-25 in the middle of the city on the 4th. During the period…2 to 3 hour delays were common at Stapleton International Airport where snowfall from the storm totaled 4.3 inches and northeast winds gusted to 30 mph on the 1st.

Intense cold accompanied the storm. Temperatures in Denver stayed below zero continuously for the best part of 3 days (3rd…4th…5th)…for a total of 69 hours. This is the fourth longest sub-zero period on record. Wind chill temperatures reached 50 degrees below zero. The mercury dipped to 24 degrees below zero on the 5th…setting a record for the date. This was the city’s coldest temperature in over 26 years. Low temperatures dipped below zero on 8 consecutive days (2nd-9th). High temperature of 9 degrees below zero on the 4th was a record low maximum for the date…as was the high of 5 degrees on the 5th. Extensive damage occurred when pipes and water lines froze and broke. Thousands of cars failed to start. On the 3rd…a 57-year-old woman died of hypothermia in an Arvada park. Eighteen high school students were treated for hypothermia after a 2-hour ride through Jefferson County in an unheated bus. At least 2 cases of frostbite were reported; there were undoubtedly many more.

1-9

In 1890…west winds were sustained to 44 mph with an extreme velocity of 45 mph. The Chinook winds warmed the temperature to a high of 66 degrees.

In 1970…high winds caused scattered damage along the foothills from Golden north. A garage in Boulder was demolished. Broken windows and roof damage were reported in Golden. Wind gusts from 60 to 100 mph were recorded in Boulder.

In 1990…a narrow band of heavy snow fell in the foothills southwest of Denver. Up to 6 inches piled up at Waterton Canyon with 5 inches around the town of Deermont…both along the South Platte River in Jefferson County. Snowfall was only 1.6 inches at Stapleton International Airport where north winds gusted to 30 mph.

In 1995…the second morning in a row of strong winds raged in the foothills and adjacent lower elevations. Winds gusted between 70 and 85 mph in the foothills and 45 to 50 mph on the plains. A tree was blown onto high voltage power lines in a west Denver suburb. The fence that the wire landed on caught fire…but did no damage to the surrounding structures. A southwest Denver man was injured when a wind gust blew him and the front door he was holding off a porch. West winds gusted to 45 mph at Stapleton International Airport. The strongest winds occurred in Georgetown where a gust to 100 mph overturned a pick-up truck camper on I-70. The driver sustained only minor injuries.

In 2001…high winds developed briefly in the Front Range foothills. A spotter at Georgetown lake measured a peak wind gust to 90 mph.

In 2008…lightning struck a home in Englewood during an electrically charged snowstorm. A gas meter at the home was hit by lightning and burst into flames. The unusual thunderstorm produced a combination of snow and graupel. The graupel was up to one half inch in diameter. Total snow accumulations ranged from 1 to 4 inches across the southern Denver suburbs. Snowfall was only 0.6 inch at the former Stapleton International Airport.

2-3

In 1894…6.2 inches of heavy snowfall were measured over downtown Denver. East winds gusted to 25 mph on the 2nd.

In 1999…a powerful Chinook windstorm struck the foothills and adjacent plains. Several locations registered wind gusts in excess of 100 mph…including: 127 mph atop sugarloaf mountain…120 mph at Lafayette…119 mph at Wondervu…104 mph at coal creek…103 mph at the Rocky Flats Environmental Test Facility and 100 mph in Louisville. The damage associated with the windstorm was extensive. Thirty 70-foot-tall power poles were damaged… Including several that supported high voltage lines transmitting electricity directly from generating plants. The combination of downed power poles…power lines…and trees resulted in outages for about 10 thousand residents. In Lafayette…power poles were sheared off for a mile and a quarter. The power outages primarily affected residents in Boulder…Broomfield…Lafayette…Louisville… And Fort Lupton. In addition to the outages…high winds ripped apart several roofs in Boulder…including the roof of the Boulder County jail. At Jefferson County Airport… Several planes were overturned and some hangars damaged or destroyed. Damage to the airport alone was estimated at 100 thousand dollars. In southern Jefferson County… Localized ground blizzards reduced visibilities in blowing snow to less than 20 feet along U.S. Highway 285…resulting in several accidents. In Pine Junction a downed tree damaged a nearby residence…when it crashed onto the roof. In Bailey…a downed tree crushed a vehicle parked in the resident’s driveway. Total damage estimates for the windstorm reached 3 million dollars…making it the fourth costliest on record at the time in Colorado. Other peak wind gusts include: 97 mph at Boulder…93 mph at the National Center for Atmospheric Research Mesa Lab in Boulder… 88 mph at Nederland…86 mph at Aspen Springs…and 83 mph at Blue Mountain near Coal Creek Canyon. West to northwest winds gusted as high as 46 mph at Denver International Airport.

Continue reading January 31 to February 6: This week in Denver weather history →

Weather History

January 24 to January 30: This week in Denver weather history

January 24, 2016 Thornton Weather Leave a comment

Denver and Colorado weather is rarely boring. This week in Denver weather history we see numerous occurrences of Chinook winds that warmed temperatures but also arrived with such force that they caused a great deal of damage. We also see unseasably warm weather, bitter Arctic cold, and snow fall that had to be measured in feet.

From the National Weather Service:

18-24

In 2005…a week of mid-winter unseasonably warm weather pushed high temperatures into the 60’s or more on all but one day. During the period…the highest temperature of 70 degrees on the 20th was a new record maximum for the date. Low temperatures remained above freezing on 4 of the days.

22-26

In 1948…the longest period of snowfall on record (92 hours and 3 minutes) occurred in downtown Denver where a total of 13.6 inches of snow fell. At Stapleton Airport…19.0 inches of snow fell…making it the heaviest snow in January and the 5th heaviest snow of record at that time. North winds were sustained to a velocity of 23 mph on the 25th…but generally the winds were light throughout the storm. The snow disrupted traffic…but street clearing was begun soon after it became apparent that the snow would be heavy. Over the 5 days…temperatures ranged from a high of 48 degrees on the 22nd to a low of 1 degree on the 26th. Most readings were in the teens and 20’s during the storm.

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In 1921…heavy snowfall in downtown Denver totaled 8.0 inches overnight. Northwest winds were sustained to 22 mph with gusts to 25 mph on the 24th.

In 1887…west winds sustained to 44 mph warmed the temperature to a high of 56 degrees in the city.

In 1890…northwest winds sustained to 48 mph with gusts to 60 mph warmed the temperature to a high of 63 degrees.

In 1900…west winds were sustained to 44 mph with an extreme velocity of 46 mph. The Chinook winds warmed the temperature to a high of 57 degrees.

In 1934…a trace of snowfall resulted in precipitation of 0.01 inch in downtown Denver. This was the only measurable amount of precipitation for the month…making the month one of the driest January’s on record.

In 1956…west-northwest winds gusted to 51 mph at Stapleton Airport. Strong and gusty winds persisted throughout the day.

In 1972…a west wind gust to 92 mph was recorded in Boulder at the National Bureau of Standards…while in downtown Boulder a wind gust to only 66 mph was measured.

In Denver…a car was demolished when the wind blew a traffic light pole onto it…and a wooden wall at a construction site was blown over damaging two cars. Northwest winds gusted to 55 mph at Stapleton International Airport.

In 1982…strong winds were again reported along the eastern foothills. While the most damage occurred in the Fort Collins area…Boulder did not entirely escape. Nine planes were damaged at the Boulder airport along with 4 mobile homes and many cars in the Boulder area. A school in Central City was damaged. A water tank in Parker collapsed. The strongest wind gust recorded was 140 mph at Wondervu. Wind gusts reached 92 mph in Boulder. Northwest wind gusts to 61 mph were recorded at Stapleton International Airport.

In 1992…for the third day…high winds raked the eastern foothills. Winds gusted to 105 mph at the National Center for Atmospheric Research in Boulder. Several tractor trailers were overturned along State Highway 93…between Boulder and Golden. Traffic lights and signs were knocked down in Boulder. Other wind reports included: 86 mph at Rocky Flats…100 mph on Fritz Peak near Rollinsville…and 93 mph in north Boulder. West winds gusted to 37 mph at Stapleton International Airport.

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In 1916…a trace of light rain…rare in Denver for January… Occurred on both days.

In 1946…high winds occurred in Boulder and along the foothills to the north. A wind gust to 72 mph was recorded at Valmont.

In 1947…strong winds were measured in Boulder. Hourly wind gusts averaged 72 mph at Valmont east of Boulder.

In 1950…heavy snowfall totaled 7.1 inches at Stapleton Airport and 6.8 inches in downtown Denver.

24-26

In 1970…a wind gust to 122 mph was recorded at the National Center for Atmospheric Research in Boulder on the 24th. Winds also gusted to 109 mph at NCAR on the 26th. Most winds were estimated between 60 and 70 mph in Boulder. Damage…in most cases…was from broken windows and tree limbs and downed power lines. A roof was blown off a house in Eldorado Springs south of Boulder. A building under construction was damaged in Boulder. Reported damage totaled 25 hundred dollars in Boulder. Northwest winds gusted to 47 mph at Stapleton International Airport on the 24th. In Denver…the Chinook winds warmed the temperature to a record high of 68 degrees on the 24th.

In 1872…the greatest temperature change in one day…66 degrees…from a low of 20 degrees below zero…a record low for the date…to a high of 46 degrees…occurred.

In 1888…west winds sustained to 42 mph warmed the temperature to a high of 58 degrees.

In 1890…northwest Chinook winds gusting as high as 48 mph resulted in two temperature records. High temperature of 72 degrees was a record maximum for the date. Low temperature of only 48 degrees was a record high minimum for the date.

In 1914…Chinook winds from the northwest sustained to 46 mph with gusts as high as 60 mph warmed the temperature to a high of 52 degrees. The low temperature was only 39 degrees.

In 1923…snowfall of 1.3 inches was the only measurable snow of the month.

In 1931…snowfall of 0.1 inch was the only measurable snow of the month. The melted snow totaled only 0.02 inch of precipitation…which was the only measurable amount of the month. This resulted in the 4th driest January on record.

In 1964…high winds occurred in Boulder…Golden…and Broomfield where a wind gust to 80 mph was recorded at Jefferson County Airport. Some power lines were downed. Damage to buildings and vehicles was also reported. West-northwest winds gusted to 46 mph at Stapleton International Airport.

In 1971…the highest recorded wind gust in the state of Colorado…147 mph…occurred at the National Center for Atmospheric Research on the mesa in southwest Boulder. Wind gusts to 91 mph were measured at the National Bureau of Standards and to 87 mph in downtown Boulder. A wind gust to 75 mph was recorded at Jefferson County Airport in Broomfield. The strong winds caused widespread minor damage in Boulder. Northwest winds gusting to 32 mph at Stapleton International Airport warmed the temperature to a high of 55 degrees.

In 1980…a blizzard struck Denver right at the evening rush hours…causing massive traffic snarls and forcing the closure of I-25 north of Denver and I-70 east of the city as well as many other roads. Hundreds of travelers were stranded. Multi-car accidents involving as many as 50 cars were common. Air traffic at Stapleton International Airport was stalled for 3 hours. Winds gusted to 50 or 60 mph with visibility reduced to zero at times. The high winds knocked out electrical power in Broomfield. During the height of the storm…temperatures plunged from the freezing mark at mid-afternoon to only 5 degrees before midnight. Initial snowfall from the storm was only 3 to 5 inches across metro Denver with 4.1 inches measured at Stapleton International Airport where north wind gusts to 58 mph were recorded.

In 1988…high winds pummeled the eastern foothills with a peak gust to 96 mph recorded near Rollinsville. A gust to 109 mph was recorded at Echo Lake. West winds gusted to 48 mph at Stapleton International Airport.

In 1996…heavy snow fell along the Front Range foothills. Snow accumulations of 4 to 8 inches were measured from I-25 west into the foothills with lighter accumulations reported elsewhere. Snowfall totaled only 0.9 inch at the site of the former Stapleton International Airport.

In 2004…locally heavy snow fell across metro Denver. The heaviest snow was south of Denver and in the foothills. Snowfall totals included: 9 inches near Indian Hills… 8.5 inches near Franktown and 9 miles southwest of Sedalia…8 inches 7 miles southwest of Aurora…and 6 inches in Highlands Ranch. Snowfall was only 2.8 inches at the site of the former Stapleton International Airport. North winds gusted to 35 mph at Denver International Airport

In 2008…strong westerly winds blew out three windows at a Chipotle restaurant in Louisville. Two people were taken to the hospital for minor cuts. At Denver International Airport…northeast winds gusted to 35 mph.

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In 1910…gale force westerly winds of great velocity struck Boulder. Some damage was reported. West winds were sustained to 45 mph in Denver on the 25th.

25-27

In 1897…a cold spell resulted in three temperature records. Low temperature of 14 degrees below zero on the 27th was a record minimum for the date. High temperatures of only 3 degrees on the 25th and 2 degrees on the 26th were record low maximums for the dates. Very light snow or flurries fell on the 25th and 26th at times.

Continue reading January 24 to January 30: This week in Denver weather history →

Weather History

January 17 to January 23: This week in Denver weather history

January 17, 2016 Thornton Weather Leave a comment

Chinook winds in January oftentimes bring welcome warmth to the Front Range. They can however be more of a curse than a blessing as at times they can reach hurricane strength and do extensive damage. Looking back at this week in Denver weather history, we see many such occurrences.

From the National Weather Service:

14-21

In 1930…a protracted cold spell occurred when low temperatures plunged below zero on 8 consecutive days. The coldest low temperatures of 20 degrees below zero on the 17th and 19 degrees below zero on the 16th were record minimums for the dates. High temperatures during the period ranged from 18 on the 18th to zero on the 20th. Two degrees on the 15th was a record low maximum temperature for the date.

15-23

In 1962…a protracted cold spell kept metro Denver in the deep freeze for more than a week. From the 15th thru the 23rd…low temperatures were zero or below for 9 consecutive days…but a daily record low was set only on the 22nd when the temperature dipped to 14 degrees below zero. A record low maximum for the date was also set on the 22nd when the temperature climbed to only 11 degrees. The coldest high temperature was 3 degrees above zero on the 21st…which did not break the record. The protracted cold was broken for only a few hours on the afternoon of the 20th when Chinook winds warmed the temperature to a high of 38 degrees before another surge of cold arctic air plunged temperatures back into the deep freeze that evening. The severe cold caused much damage to water systems. A woman was frozen to death at Morrison. There were other deaths attributable to the weather…including traffic deaths and heart attacks from overexertion.

16-17

In 1886…a brief cold spell resulted in two temperature records. High temperatures of zero degrees on the 16th and 2 degrees below zero on the 17th were both record low maximums for the dates. Low temperatures of 8 degrees below zero on the 16th and 16 degrees below zero on the 17th were not records.

In 1930…temperatures plunging well below zero resulted in two records. Low temperatures of 19 degrees below zero on the 16th and 20 degrees below zero on the 17th were record low temperatures for the dates. High temperatures were 4 degrees on the 16th and 15 degrees on the 17th. Light snowfall totaled 4.0 inches. North winds were sustained to 18 mph on the 16th.

In 1964…high winds struck the eastern foothills. Gale velocity winds were recorded in Boulder with gusts to 83 mph measured at Rocky Flats. Several airplanes were damaged at the Jefferson County Airport in Broomfield. Roofs…walls…and parts of buildings were blown away at various locations. Power poles and trees were blown over.

16-18

In 1943…light snowfall totaled 3.2 inches over the 3 days. This was the only measurable snow of the month. North winds were sustained to 20 mph on the 16th.

In 2011…very strong winds associated with an upper level jetstream over Colorado produced blizzard conditions in the mountains above timberline. Peak wind gusts included: 99 mph atop Loveland pass…94 mph… 2 miles southwest of Mary Jane…80 mph atop Berthoud Pass and 79 mph atop Niwot Ridge. Storm totals in the ski areas west of Denver ranged from 8 to 14 inches.

In 1872…light snow fell during the morning and continued into the afternoon until 3:30 pm. The sky commenced to clear a little before 2:00 pm…but snow fell thickly for at least half an hour even though the sky was perfectly clear overhead. Melted snow totaled 0.33 inches.

In 1888…northwest winds were sustained to 46 mph in the city.

In 1905…intermittent rain…unusual in January…occurred during the day. The rain changed to snow during the late evening…but ended before midnight. Snowfall was 2.0 inches. Precipitation totaled 0.62 inch. The temperature ranged from a high of 44 degrees to a low of 32 degrees.

In 1950…wind gusts to 62 mph caused some blowing dust at Stapleton Airport.

In 1982…one of the worst wind storms in many years hit the Front Range foothills. The strongest winds occurred in Boulder where at 2:30 am a wind gust to 147 mph was recorded at the National Center for Atmospheric Research…on the mesa in southwest Boulder. At this location 20 wind gusts over 120 mph were clocked between 1:00 am and 9:00 am. An estimated 40 percent of all buildings in Boulder received at least minor wind damage. About 50 homes were damaged enough to be uninhabitable. At least 15 homes in the Table Mesa area of Boulder lost roofs. Twenty small airplanes were destroyed at the Boulder airport. Utility poles were snapped in two…and about one-seventh of the buildings in the area were without power. Insured damage totaled 20 million dollars making the wind storm the most costly on record in Colorado at the time.

In 1989…high winds were recorded along the eastern foothills with gusts to 90 mph recorded at Rollinsville. North of Denver on I-25…the wind injured two men when their tractor trailer was blown off the road and rolled. West winds gusted to 48 mph at Stapleton International Airport.

In 1990…an intense but localized snow storm caught many people by surprise when it dumped 3 to 6 inches of snow during a 3-hour period across portions of Boulder County. The storm swath approximately 20 to 30 miles wide stretched northeast from Boulder to just east of Longmont. Only light snow fell over the remainder of metro Denver with 0.2 inch of snowfall measured at Stapleton International Airport where northeast winds gusted to 30 mph.

In 1998…strong winds in the foothills spread over the plains mainly north of metro Denver. Winds gusted to 75 mph at Golden Gate Canyon. West winds gusted to 34 mph at Denver International Airport.

17-18

In 1974…rare overnight January rainfall totaled 0.12 inch on the 17th and 0.26 inch on the 18th when it was briefly mixed with snow.

In 2012…damaging winds developed in and near the Front Range. In Boulder…the high winds knocked down several trees… Power poles and electrical lines. Some of the fallen trees damaged homes and automobiles. A semi-trailer was blown on its side along State Highway 93 near Marshall. Peak wind gusts included: 104 mph in south Boulder; 98 mph…3 miles southwest of Pinecliffe; 95 mph…2 miles northwest of Rocky Flats; 92 mph…at State Highway 93 near Marshall; 87 mph at Berthoud Pass and in Boulder Canyon; 80 mph…5 miles west- northwest of Boulder; 83 mph at NCAR Mesa Lab; 78 mph…8 miles northeast of Four Corners; 79 mph at the National Wind Technology Center; 76 mph at Wondervu; 75 mph atop Loveland Pass and the NCAR foothills lab in Boulder; 74 mph at Blue Mountain…Boulder Municipal Airport… 1 mile northwest of Lyons; 73 mph…4 miles east-northeast of Nederland; 72 mph at the junction of State Highways 72 and 93; 62 mph in Superior; and 61 mph at Erie Municipal Airport. A peak wind gust of 38 mph from the northwest was observed at Denver International Airport.

Continue reading January 17 to January 23: This week in Denver weather history →

Weather History

January 10 to January 16: This week in Denver weather history

January 10, 2016 Thornton Weather Leave a comment

January weather is like the weather of any other month in Denver in that you can see just about any type of condition possible. However, three conditions are dominant during the month – wind, snow and cold. All three make many appearances in our look back at this week in Denver weather history.

From the National Weather Service:

7-10

In 1962…a major winter storm dumped 13.5 inches of snow on metro Denver. A foot of the snow fell on the 8th when northeast winds gusted to 30 mph. The storm was followed by an intense blast of very cold arctic air. Minimum temperature readings of 24 degrees below zero occurred on both the 9th and 10th. The temperature never reached above zero on the 9th when a maximum reading of 1 degree below zero was recorded. Temperatures were below zero for 37 consecutive hours.

8-10

In 1983…winds of 70 to 90 mph howled through Boulder. A wind gust to 100 mph was recorded on Fritz Peak near Rollinsville. A tree blown down by the wind damaged a house in eastern Boulder County. The strong winds developed behind a cold front late on the 8th and continued through the 10th. At Stapleton International Airport…west to northwest winds gusted to 49 mph on the 8th…to 45 mph on the 9th…and to 48 mph on the 10th.

9-10

In 1962…the low temperature plunged to 24 degrees below zero on both days.

In 1972…a west wind gust to 60 mph was recorded at Stapleton International Airport…while in Boulder a wind gust to 86 mph was recorded at the National Bureau of Standards. The roof of a house was blown off…and trees were blown down in Boulder. The high winds contributed to the damage from a building fire in Boulder.

In 2000…heavy snow and strong winds in the mountains spilled into the Front Range foothills. Ward…northwest of Boulder…received 9 inches of new snow. Wind gusts to 91 mph were measured in Golden Gate Canyon…with gusts to 77 mph at Loveland Ski Area and to 73 mph along State Highway 93 north of Golden. West winds gusted to 44 mph at Denver International Airport on the 9th.

In 2011…a winter storm brought moderate to heavy snowfall to areas in and near the Front Range foothills and Palmer Divide. Storm totals included: 13 inches…3 miles south of Golden; 11.5 inches near Eldorado Springs…10.5 inches… 2 miles southwest of Boulder; 10 inches…3 miles southwest of Roxbourough State Park; 9 inches at Genessee…8.5 inches in Arvada…4 miles south-southeast of Bennett and greenwood village…8 inches… 8 miles south of Elizabeth; 7 inches at Commerce City and 6.5 inches near Louisville and at Denver International Airport. Gusty winds produced snow drifts up to 2 feet deep over the Palmer Divide.

In 1893…strong west winds in Boulder and the adjacent foothills caused only minor damage.

In Denver…northwest winds were sustained to 48 mph with gusts as high as 60 mph. The Chinook winds warmed the temperature to a high of 64 degrees and a low of only 40 degrees…which was a record high minimum for the date.

In 1911…southwest Chinook winds sustained to 44 mph warmed the temperature to a high of 60 degrees.

In 1932…the first thunderstorm ever officially recorded in Denver during January occurred in the early morning. The assistant observer heard two prolonged peals of thunder between 4:20 am and 4:25 am. Another off-duty observer was awakened by the thunder. Other people reported both thunder and lightning. Light snow was falling at the time. Pellets of graupel or hail were reported from some parts of the city. Snowfall totaled only 1.8 inches. Northwest winds gusted to 30 mph.

In 1962…as the temperature dipped to a frigid 24 degrees below zero…setting a new record minimum for the date… The pressure adjusted to sea level reached the highest ever recorded in Denver…31.24 inches (1057.8 mb). The altimeter setting reached 30.70 inches…and the actual station pressure recorded was 25.260 inches.

In 1988…strong winds occurred throughout the day in and near the foothills. Peak gusts to 85 mph were recorded at Rollinsville…84 mph at Echo Lake…and 64 mph in Boulder.

In 1990…a third consecutive day of 50 to 85 mph wind gusts occurred in and along the eastern foothills. A 5 mile portion of the Denver-Boulder turnpike was closed after clouds of blowing dust and gravel caused several multicar accidents near Broomfield. One 59-year-old woman was killed and two others injured. A wind gust to 81 mph was recorded at the nearby Jefferson County Airport.

In Boulder…wind gusts to 85 mph were blamed for ripping off a portion of a roof on a house…as well as blowing out the large picture window. West winds gusted to 41 mph at Stapleton International Airport. The warm Chinook winds set a record high temperature of 71 degrees in Denver for the date.

In 1996…strong northwest winds developed behind a pacific cold front that moved rapidly across northeast Colorado. A peak wind gust to 64 mph was recorded at the Rocky Flats Environmental Test Facility in Jefferson County. North- northeast winds gusted to 38 mph at Denver International Airport.

10-11

In 1948…strong winds were reported in Boulder and Lakewood. Winds of 50 to 60 mph were reported at Valmont…just east of Boulder. Only minor damage was reported.

In 1980…strong winds of 60 to 95 mph howled across metro Denver…causing some brief power outages and some broken windows. A wind gust to 111 mph was recorded at Wondervu. Northwest winds gusted to 40 mph at Stapleton International Airport on the 10th.

In 1999…high winds gusting to 100 mph blasted the foothills. Peak wind gusts included: 100 mph at central city…98 mph at Wondervu…82 mph at Aspen Springs and Golden Gate Canyon… 81 mph at the NCAR Mesa Lab in Boulder and near Nederland… 78 mph atop Blue Mountain near Coal Creek Canyon…and 72 mph at the Rocky Flats Environmental Test Facility. West winds gusted to 38 mph and warmed the temperature to a high of 63 degrees at Denver International Airport on the 11th.

10-12

In 1997…heavy snow fell over the Front Range foothills. A foot of new snow was measured at Blackhawk with 7 inches recorded in Coal Creek Canyon. Only 3.3 inches of snow fell at the site of the former Stapleton International Airport. East-northeast winds gusted to 18 mph at Denver International Airport on the 11th.

10-13

In 1963…a arctic cold wave plunged temperatures well below zero across metro Denver. Temperatures were below zero for a total of 64 consecutive hours. Low temperatures reached 25 degrees below zero on both the 11th and 12th. The high temperature of 9 degrees below zero on the 11th was the coldest ever recorded at Stapleton Airport and equaled the record low maximum for the month first set on January 19…1883…in downtown Denver. The high temperature on the 12th reached only 1 degree below zero. On the 12th…an 18-year-old youth died of exposure from the extreme cold in Denver. There were many losses and damage to property from frozen water systems…stalled cars…and over-burdened heating systems. Light snow accompanied the arctic blast. At Stapleton Airport…2.3 inches of snow fell on the 10th and 11th.

Continue reading January 10 to January 16: This week in Denver weather history →

Weather History

January 3 to January 9: This week in Denver weather history

January 3, 2016 Thornton Weather Leave a comment

January weather in Colorado can be as varied as during any month of the year. Temperatures bordering on spring-like to bone chilling Arctic cold can be seen. Snow of course plays a big part and while not always recognized as a big danger, high speed damaging winds are not unusual.

31-6

In 1973…the 31st marked the start of a protracted cold spell that extended into January of 1974 when temperatures dipped below zero on 7 consecutive days. Record daily minimum readings occurred on the 3rd and 5th when the temperature plunged to 17 degrees below zero on both days. A record low daily maximum temperature of only 4 degrees occurred on the 5th.

31-7

In 1941…a protracted cold spell through January 7…1942… Produced below zero low temperatures on 7 of the 8 days. A low temperature of 2 degrees on the 3rd prevented a string of 8 days below zero. The coldest days during the period were the 1st with a high of 2 degrees and a low of 9 degrees below zero…the 4th with a high of 2 degrees and a low of 11 degrees below zero…and the 5th with a high of 26 degrees and a low of 12 degrees below zero.

1-5

In 1940…the first days of the month were characterized by a mixture of drizzle…light snow…and fog. Fog occurred on each day. On the 4th and 5th considerable glazing resulted from freezing drizzle. All objects were coated with a glaze on the windward side. This resulted in very slippery streets…which caused several minor traffic accidents. The glaze was not heavy enough to damage wires and cables.

2-3

In 1971…a major storm dumped a total of 8.4 inches of snow at Stapleton International Airport where north winds gusted to 23 mph.

In 1972…a strong cold front late on the 2nd produced north wind gusts to 35 mph at Stapleton International Airport. Snow…heavy at times on the 3rd…totaled 6.4 inches as temperatures hovered only in the single digits.

In 2000…heavy snow fell over the higher terrain of the palmer divide to the south of metro Denver. Snowfall totaled 7 inches 5 miles southwest of Sedalia. Only 1.5 inches of snowfall were measured at the site of the former Stapleton International Airport.

2-4

In 1949…the worst blizzard in many years struck metro Denver and all of northern Colorado. The storm produced blizzard conditions with wind gusts of 40 to 50 mph all day on the 3rd when temperatures were only in the single digits. This resulted in extremely cold wind chill temperatures of 40 to 55 degrees below zero. Stapleton Airport received 13.3 inches of snow from the storm… While downtown Denver received 11.8 inches. The snow fell for 51 consecutive hours downtown. Numerous lives were lost…and livestock losses were high across the northeastern plains of Colorado where extensive airlift operations were needed to bring supplies and food to isolated communities.

2-5

In 1959…very cold temperatures…to near zero and below…caused power and gas lines…water pipes…and automatic sprinkler systems to break. In Boulder… Merchandise and furnishings were water damaged when pipes burst in a department store…flooding three floors. The temperature was below zero for 38 consecutive hours at Stapleton Airport on the 2nd…3rd…and 4th and plunged to a low of 13 degrees below zero on the 4th.

In 1874…heavy snowfall totaled 6 inches with 5 inches falling in 3 hours. Melted snow totaled 0.40 inches of precipitation. Northeast winds were sustained to 24 mph.

In 1887…west winds were sustained to 44 mph in the city.

In 1913…northwest Chinook winds sustained to 42 mph with gusts to 52 mph warmed the temperature to a high of 58 degrees. The low temperature was only 40 degrees.

In 1951…northwest winds gusted to 56 mph at Stapleton Airport.

In 1967…a strong Chinook wind reached 90 mph at the National Center for Atmospheric Research in Boulder. In downtown Boulder winds only gusted to 35 mph. Northwest winds gusting to 49 mph produced some blowing dust at Stapleton International Airport.

In 1986…winds gusted to 63 mph at Jefferson County airport near Broomfield and reached 73 mph at Echo Lake in the foothills west of Denver. West winds gusted to 46 mph at Stapleton International Airport.

In 1994…high winds raked the eastern foothills. Wind gusts to 99 mph were recorded on Squaw Mountain…south of Idaho Springs…and gusts to 85 mph occurred at the rocky flats facility in northwest Jefferson County. Northwest winds gusted to 41 mph at Stapleton International Airport. No significant damage was reported.

In 1996…very strong Chinook winds gusting to 104 mph blasted the Front Range foothills and portions of metro Denver. Three people were injured in separate incidents. One man was injured when strong crosswinds toppled his moving van into oncoming traffic along Colorado 93 south of Boulder. Two other people received minor injuries from flying debris. At the Rocky Flats Environmental Test Facility…eleven hazardous waste storage facilities received at least 100 thousand dollars in damage. In addition…several power lines were downed leaving 3 thousand homes and stores without power. Hundreds of car windows were shattered…and several signs were toppled from buildings. Some of the strongest wind gusts included: 104 mph at Boulder municipal airport…98 mph in south Boulder…96 mph at Jefferson County airport…94 mph at the National Center for Atmospheric Research southwest of Boulder…91 mph at the Rocky Flats Environmental Test Facility…and 90 mph at Wondervu southwest of Boulder. West-northwest winds gusted to only 39 mph at Denver International Airport where the Chinook winds warmed the temperature to a high of 52 degrees.

In 2004…bands of heavy snow fell across metro Denver. Snowfall totals included 6.5 inches in Broomfield and 6 inches in Westminster…Arvada…and near Hudson. Only 0.5 inch of snow fell at the site of the former Stapleton International Airport. More snow fell in the foothills with 9 inches recorded near Jamestown. Southeast winds gusted to 25 mph at Denver International Airport.

In 2006…locally high winds developed in northern Jefferson County over and near rocky flats. Peak wind gusts from 75 to 91 mph were recorded during the afternoon. A semi-trailer truck was blown onto its side on State Highway 93 atop rocky flats. Strong winds also spread across metro Denver. West winds gusted to 44 mph at Denver International Airport.

Continue reading January 3 to January 9: This week in Denver weather history →

Weather History

December 27 to January 2: This week in Denver weather history

December 27, 2015 Thornton Weather Leave a comment

Snow and wind are the two dominant weather conditions seen on our look back at this week in Denver weather history. Nine years ago, the second of two major winter storms buried Denver and closed highways. Eight years ago, damaging winds that downed trees and caused power outages occurred.

25-31

In 1980…temperatures were unusually warm during the week between Christmas and new year’s. High temperatures for the week ranged from the mid-50’s to the mid-70’s. Four temperature records were set. Record highs occurred on the 26th with 68 degrees…the 27th with 75 degrees…and the 30th with 71 degrees. A record high minimum temperature of 41 degrees occurred on the 27th.

26-27

In 1954…a major storm dumped heavy snow across metro Denver. Snowfall totaled 8.6 inches at Stapleton Airport. The storm produced the heaviest snowfall of the calendar year and was the only measurable snowfall in December.

In 1987…a snowstorm stalled in northeastern Colorado…giving metro Denver its worst winter storm in 4 years. Total snowfall from the storm ranged from 12 to 18 inches on the east side…1 to 2 feet in Boulder County…and 2 to 3 feet in western and southern parts of metro Denver. The largest reported snowfall was 42 inches at Intercanyon in the foothills southwest of Denver. Snowfall totaled 14.9 inches at Stapleton International Airport. Winds were light on the 26th…but increased as high as 40 mph on the 27th… Creating near-blizzard conditions and forcing complete closure of Stapleton International Airport for about 8 hours. The strong winds whipped drifts to 5 feet high on the east side of town. All interstate Highways leading from Denver were closed on the 27th.

26-28

In 1979 a heavy snow storm dumped 6 to 10 inches of snow over the metro area and 15 to 20 inches at Boulder with up to 2 feet in the foothills west of Boulder. Heavy snowfall totaled 6.0 inches at Stapleton International Airport where north winds gusted to 21 mph. Most of the snow… 4.8 inches…fell on the 27th.

In 1895…west Chinook winds sustained to 44 mph with gusts to 48 mph warmed the temperature to a high of 52 degrees.

In 1901…an apparent cold front produced sustained north winds to 41 mph with gusts to 48 mph.

In 1957…northwest winds gusting to 52 mph produced some blowing dust across metro Denver.

In 1975…a northwest wind gust to 53 mph was recorded at Stapleton International Airport.

In 1976…a strong pacific cold front moving across metro Denver produced a northwest wind gust to 53 mph at Stapleton International Airport.

In 1990…high winds raked the eastern foothills with a wind gust to 84 mph clocked on fritz peak near Rollinsville. The strong northwest winds of 50 to 70 mph whipped newly fallen snow over higher areas into billowy clouds several hundred feet high that could be seen from most locations across metro Denver.

In 1996…another round of high winds developed over portions of the Front Range foothills during the morning hours. Several wind gusts from 70 to 100 mph were reported at Wondervu southwest of Boulder. West-northwest winds gusted to 38 mph at Denver International Airport.

In 2005…a trained weather observer in Georgetown recorded a wind gust to 94 mph. No damage was reported.

In 2007…a winter storm brought heavy snow to portions of the urban corridor and adjacent plains. Storm totals generally ranged from 3 to 7 inches. Locally heavier bands produced up to 10 inches of snow. In the urban corridor…storm totals included: 10 inches…10 miles south-southeast of Buckley AFB and at Castle Pines; 9.5 inches…4 miles south-southeast of Aurora and Kassler; 7.5 inches…2 miles southeast of Highlands Ranch; 7 inches in Aurora and Sedalia; 6.5 inches in Arvada…4 miles east of Denver and Lafayette; 6 inches in Castle Rock and Thornton. A measurement of 5.4 inches was taken at the former Stapleton International Airport. The official total for the month was 20.9 inches; making it the 6th snowiest December on record.

27-28

In 1997…high winds combined with fresh snow from a previous storm caused highways to become slick from drifting snow and near whiteout conditions in localized ground blizzards. Strong winds blew snow across the runways at centennial airport…which glazed over and formed areas of ice. Two planes were damaged when they slid off the runway while landing. No injuries were reported. Numerous accidents also occurred on I-25 and I-70 as ice formed under the same conditions. A rollover accident which injured 4 people on State Highway 93 near the Rocky Flats Environmental Test Facility was also attributed to the high winds. The high winds caused an office building and showroom under construction in Golden to collapse. The largest wall was 180 feet long and 28 feet high. Some high wind reports included: 86 mph at Golden Gate Canyon…72 mph near Conifer…and 70 mph at Jefferson County airport and the National Center for Atmospheric Research on the mesa near Boulder. West-northwest winds gusted to 53 mph at Denver International Airport on the 27th.

In 1998…damaging downslope winds formed in and near the foothills. Peak wind gusts ranged from 71 to 114 mph. Numerous trees were blown down in Coal Creek Canyon and near gross reservoir. Power lines were blown down… Resulting in scattered outages. Peak wind reports included: 114 mph at Wondervu…92 mph in Golden Gate Canyon…88 mph in Coal Creek Canyon…and 79 mph 8 miles west of Conifer. West winds gusted to 46 mph at Denver International Airport on the 28th.

27-29

In 1983…a second surge of bitter cold air in less than a week was less intense. Record breaking low temperatures of 12 degrees below zero on the 28th and 15 degrees below zero on the 29th were accompanied by 3.7 inches of snowfall and northeast winds gusting to 23 mph.

In 2001…brief high winds developed in the foothills west of Denver. Winds gusted to 86 mph on Fritz Peak near Rollinsville. West to northwest winds gusted to 39 mph at Denver International Airport where the temperature climbed to a high of 51 degrees.

28-29

In 1906…a trace of snow fell on both days…which along with a trace of snow on the 5th…was the only snow of the month…ranking the month the second least snowiest December on record.

In 1970…wind gusts to 87 mph were recorded at the National Center for Atmospheric Research in Boulder. Winds gusted to only 46 mph in downtown Boulder. Damage was minor.

In 2006…while metro Denver residents were still digging out from the heavy snowfall and blizzard that occurred on December 20-21…the second major winter storm in a week buried the city and the eastern foothills again in more deep snow. Heavy snowfall ranged from 1 to 2 1/2 feet in the foothills and from 6 to 18 inches across the city. Another slow moving storm system centered over the Texas panhandle produced deep upslope flow over the high plains and against the Front Range mountains. The storm produced blizzard conditions over the plains mainly south of interstate 76. Interstate 70 as well as other roads and highways was closed from Denver to the Kansas line due to snow and blizzard conditions. Greyhound was forced to cancel all bus trips from Denver. The heaviest snow fell in and near the foothills and south of Denver over the palmer divide…where north winds sustained at speeds of 20 to 30 mph with gusts to 40 mph piled the snow into drifts 4 to 14 feet deep. In the city…the heavy snowfall persisted for a total of 29 hours. Snowfall totals across metro Denver included: 17.5 inches at Ken Caryl; 15 inches 3 miles south-southeast of Morrison; 14 inches in Boulder and Lone Tree; 12 inches in Castle Rock and Highlands Ranch; 11 inches in Wheat Ridge; 10.5 inches in Littleton; 10 inches in Arvada…Broomfield…and Louviers; and 8.5 inches in Lakewood and Thornton. Officially…snowfall totaled 8.0 inches at Denver Stapleton. North winds sustained to 25 mph with gusts to 32 mph produced some blowing snow at Denver International Airport. In the city…this second storm increased the total snowfall for the month to 29.4 inches…making the month the third snowiest on record. In the foothills the snow fell at a rate of 3 to 4 inches an hour at times. Total snowfall in the foothills included: 30 inches near Genesee; 29.5 inches 12 miles northwest of Golden; 25 inches in Evergreen and near Bergen Park; 24 inches near Conifer; 23.5 inches 3 miles southwest of Golden and near Gold Hill; 23 inches near Jamestown; 22.5 inches in Rollinsville; 19.5 inches in Aspen Springs; 19 inches near Blackhawk; 18.5 inches at Nederland; 16 inches in Indian Hills…at Intercanyon…and in Eldora; 15.5 inches at Echo Lake; and 12 inches near Ralston Reservoir. The total cost of snow removal just at Denver International Airport from this storm and the previous storm was in tens of millions of dollars. The airport estimated up to 6.7 million dollars in extra costs for contractors…overtime…equipment…de-icing chemicals…and other expenses. The two storms cost the airport 4.6 million dollars in loss concession revenues. United airlines reported lost revenue of over 25 million dollars from the two storms…while frontier airlines lost an estimated 12.1 million dollars.

In 1997…high winds persisted mainly in and near the foothills. Strong cross winds gusting between 60 and 70 mph blew a rental truck off the roadway in northern Jefferson County near the Coal Creek Canyon road. West winds gusted to 33 mph at Denver International Airport.

In 2005…high winds were recorded across metro Denver. Peak wind gusts included 75 mph near Chatfield Reservoir and 64 mph at Denver International Airport. No damage was reported.

29-30

In 1898…heavy snowfall totaled 6.2 inches in downtown Denver. Northeast winds were sustained to 35 mph with gusts to 40 mph on the 29th.

In 1912…strong winds buffeted Boulder…causing hundreds of dollars damage. The winds were described as one of the most terrific in the history of the city.

In 1923…a cold wave caused temperatures to plunge 58 degrees in 24 hours. The temperature was 54 degrees at 2:00 pm on the 29th and only 4 degrees below zero at the same time on the 30th. The low temperature of 14 degrees on the 29th was the high temperature on the 30th. The low temperature on the 30th dipped to 10 degrees below zero. Light snowfall totaled only 0.7 inch. Northeast winds were sustained to 23 mph on the 29th.

In 2008…very strong Chinook winds blasted areas in and near the foothills of Boulder and Jefferson counties. The wind blew down trees and power poles…downed electrical lines and fences…and damaged homes and vehicles. Scattered power outages were reported along the Front Range. In metropolitan Denver alone…24…000 Xcel customers were affected by the outages. Four planed were damaged at the Vance Brand Municipal Airport in Longmont…one was heavily damaged. Insurance companies estimated up to 7 million dollars in damage. Peak wind gusts included 87 mph at the National Wind Technology Center…86 mph…2 miles north of Longmont; 77 mph at Erie…and 75 mph at Lafayette. On the 30th…a peak wind gust to 47 mph was recorded at Denver International Airport.

Continue reading December 27 to January 2: This week in Denver weather history →

Weather History

December 20 to December 26: This week in Denver weather history

December 20, 2015 Thornton Weather Leave a comment

The week leading up to Christmas is hectic enough but when you through in severe weather, it can be overwhelming. This week marks a number of notable weather events in Denver weather history but two stand out. Most recently was the storm three years ago that became the seventh biggest snowstorm in Denver weather history. Of course probably the most memorable for longtime Denver residents is the Christmas Eve storm of 1982 that buried the city for the holiday and for days afterwards.

Related: The Christmas Eve blizzard of 1982 – The best of Denver storms

From the National Weather Service:

17-24

In 1924…a prolonged cold spell occurred after mild temperatures during the first half of the month. Most low temperatures dipped below zero with the coldest reading of 15 degrees below zero occurring on the 24th. The high temperature of only 5 degrees on the 18th was a record low maximum for the date.

18-21

In 2010…a winter storm produced a 4-day period of moderate to heavy snow in the mountains. The combination of strong wind and heavy snow forced the closure of several mountain passes due to the threat of avalanches. The Amtrak train route… Which runs from Denver to California…was rerouted through Wyoming when Union Pacific closed its tracks along Interstate 70. Numerous accidents forced the closure of I-70 at times. The wind gusted to 60 mph over the higher mountain passes. Storm totals in the ski areas west of Denver ranged from 16 to 32 inches.

18-24

In 1998…a vigorous cold front with north winds gusting as high as 38 mph at Denver International Airport on the 18th dropped temperatures from a high of 51 degrees to a low of just 6 degrees before midnight. The arctic air mass that settled over metro Denver produced intermittent light snow and a week-long protracted cold spell that caused low temperatures to plunge well below zero for 6 consecutive nights. The coldest temperature was 19 degrees below zero on the morning of the 22nd. High temperatures climbed only into the single digits on 4 consecutive days…from the 19th through the 22nd. At least 15 people…mostly homeless… Were treated for hypothermia at area hospitals. The bitter cold weather was responsible…either directly or indirectly… For at least 5 fatalities. Three of the victims died directly from exposure. The cold weather also caused intermittent power outages. Following the cold snap… Thawing water pipes cracked and burst in several homes and businesses…causing extensive damage. Only one temperature record was set. The high temperature of only 7 degrees on the 19th set a record low maximum for the date.

19-20

In 1982…high winds buffeted the eastern foothills. At midday on the 19th…gusts of 75 to 80 mph were recorded in the Table Mesa area of Boulder. A gust to 62 mph was clocked in Boulder on the evening of the 20th.

In 1989…strong winds howled at mountain top level in clear creek and Gilpin counties. Speeds reached 97 mph on the summit of Squaw Mountain and 84 mph one mile south of Rollinsville. Northwest winds gusted 35 mph at Stapleton International Airport on the 20th.

19-23

In 1990…a surge of very cold arctic air invaded metro Denver. Many temperature records were broken as the mercury remained at or below zero for 85.5 hours at Stapleton International Airport…making it the third longest period of subzero readings in 118 years of record keeping. On the morning of the 22nd…the mercury plunged to 25 degrees below zero…which equaled the all time record low temperature for the month set on December 24…1876. In the foothills southwest of Denver at tiny town…the mercury plunged to 33 degrees below zero on the morning of the 21st. On the same morning at Castle Rock the temperature dipped to 26 degrees below zero. During the period…other daily temperature records were set at Denver…including: record low maximum of 3 degrees below zero on the 20th and a record low of 17 degrees below zero on the 23rd. The record low was equaled with 16 degrees below zero on the 20th and 21 degrees below zero on the 21st. Snowfall totaled 2.7 inches at Stapleton International Airport from the 19th through the 21st.

In 1894…southwest winds were sustained to 40 mph with gusts to 48 mph. The Chinook winds warmed the temperature to a maximum of 69 degrees…which was a record high temperature for the date. The minimum temperature dipped to only 33 degrees.

In 1903…northwest Chinook winds sustained to 54 mph with gusts to 60 mph warmed the temperature to a high of 58 degrees.

In 1948…strong winds occurred along the eastern foothills from Boulder north. Wind gusts to 45 mph were recorded at Valmont with a gust to 30 mph at Boulder airport. Some damage occurred. Wind gusts to 50 mph caused some blowing dust at Stapleton Airport.

In 1957…strong Chinook winds…gusting to 51 mph from the northwest…warmed the afternoon temperature to a high of 54 degrees.

In 1981 high winds were reported in the foothills with a peak gust of 87 mph recorded at Wondervu.

In 1992…strong Chinook winds raked the eastern foothills with 69 mph recorded at Table Mesa in south Boulder. Southwest winds gusted to only 21 mph at Stapleton International Airport.

In 1996…five construction workers were injured…two seriously…when a sudden wind gust blew over a 30-foot- high retaining wall they were working on in western Lakewood. The scaffolding they were standing on collapsed…and some were pinned under the rubble for 15 minutes. Wind gusts of 60 to 75 mph were reported in the area. Southwest winds gusted to only 24 mph at Denver International Airport.

In 2004…strong downslope winds developed over the eastern mountain slopes and spread over metro Denver. Peak wind gusts approached 100 mph along the foothills of Boulder County. In superior…a 1200-square-foot section of roof was peeled off the gymnasium at monarch high school. Two semi-trailers were toppled on Colorado Highway 58 at McIntyre Street and another at c-470 and West Bowles Avenue. Two airplanes were damaged by wind-blown debris at Jefferson County airport. The high winds forced the closure of State Highway 93 between Golden and Boulder for approximately two hours. Insurance agents estimated 650 to 850 homes suffered wind damage in the Boulder and Louisville areas. In addition…downed trees and power lines left about 1000 residents…mainly in the Boulder area…without electricity. At least three people suffered minor injuries in the storm. Peak wind reports included: 95 mph in superior…92 mph at Jefferson County airport…85 mph in Golden…81 mph in Boulder…80 mph in Broomfield and Evergreen…and 79 mph in Louisville. West northwest winds gusted to 59 mph at Denver International Airport.

20-21

In 1969…high winds caused widespread…but mostly minor damage to roofs…windows…and power lines and overturned some house trailers in areas along and just east of the foothills. Wind gusts of 60 to 70 mph were reported in Boulder and south of Boulder at Rocky Flats. A wind gust to 115 mph was measured in Boulder at the National Center for Atmospheric Research. At Stapleton International Airport…west winds gusted to 44 mph on the 20th and to 45 mph on the 21st. The warm Chinook winds warmed the high temperature to 56 degrees on the 20th and to 65 degrees on the 21st.

In 2006…a major blizzard buried greater metro Denver and the adjacent foothills in deep snow. A slow moving upper level low pressure center produced deep moist upslope flow over the high plains and against the eastern slopes of the mountains…allowing heavy snowfall to persist for 34 hours across metro Denver. Total snow accumulations ranged from 1 to 2 1/2 feet across the city and from 2 to nearly 4 feet in the foothills. Adding to the misery… Strong north winds sustained at 20 to 35 mph with gusts from 45 to nearly 60 mph produced much blowing snow and piled the snow into drifts from 6 to 12 feet high…closing businesses and bringing all transportation to a halt. The storm forced the closure of Denver International Airport for a total of 45 hours which snarled the nation’s air traffic system. This was the longest closure in the airport’s 12 year history. The closure stranded nearly 5000 travelers when 2000 flights were canceled. Many inbound flights were diverted to other airports…stranding even more passengers. Many of the stranded travelers failed to reach their final destinations until days after the airport re-opened due to fully booked flights during the holiday season. Police and national guardsmen rescued hundreds of commuters stuck in their cars…and sent them to temporary shelters set up by the Red Cross. All interstates and other major highways in and out of Denver were closed. Greyhound was forced to cancel all bus trips from Denver. Mail delivery was suspended. The Regional Transportation District suspended all metro Denver bus service for the first time since the March 2003 blizzard. The roof of a discount store in Aurora collapsed under the weight of the heavy snow. In Lakewood…a power outage left 5600 residents without electricity for a brief time. Metro Denver snowfall amounts included: 34 inches 10 miles southeast of Buckley AFB…32 inches in Littleton…30 inches in Thornton and near Castle Rock…29.5 inches near Parker…28 inches in Wheat Ridge…25.5 inches at Centennial Airport…25 inches at Niwot…24 inches in Aurora…22.5 inches at Greenwood Village… 22 inches in Arvada…21.5 inches in Lakewood…20 inches in Longmont…and 15.5 inches in Boulder. Snowfall measured 20.7 inches officially in the Denver Stapleton area. This ranked the snowfall as the 7th greatest in the city since 1946. North winds were sustained to 37 mph with gusts to 55 mph at Denver International Airport. In the foothills snowfall totaled: 42 inches at Conifer and 11 miles southwest of Boulder…40 inches at Evergreen…39 inches at Aspen Springs… 37.5 inches 8 miles north of Blackhawk…33 inches near Nederland…31 inches at Intercanyon and near Tiny Town…30.5 inches atop Buckhorn Mountain…30 inches near Indian Hills… 29 inches at Rollinsville…24 inches near Gross Reservoir and Ralston Reservoir…22.4 inches atop Crow Hill…and 20 inches near Georgetown. Snowpacked and rutted streets and parking lots persisted for a month or more after the storm and subsequent storms. The heavy snowfall created a snow removal controversy when many citizens complained that residential streets were not cleared in a timely manner in the city and in some suburban areas. This was in spite of the fact that tens of millions of dollars were spent on snow removal. In the city of Denver…snow cover of an inch or more from this storm and subsequent storms persisted for 61 consecutive days…through February 19…2007. This is the second longest period of snow cover on record in the city. Many homeowners who had extensive Christmas lights and decorations in their yards were not able to remove the lights because the wires were buried in deep snow and ice until the end of February or later.

Continue reading December 20 to December 26: This week in Denver weather history →

Weather History

December 13 to December 19: This week in Denver weather history

December 13, 2015 Thornton Weather Leave a comment

December can of course be cold and that is why Chinook winds are sometimes welcomed as they bring warm air to the Front Range. However, those winds can also cause a great deal of damage if they blow too hard and we see that in our look back at this week in Denver weather history. Particularly notable were winds on December 14th & 15th which caused accidents, toppled power poles and fences, ripped off roofs and more.

From the National Weather Service:

2-17

In 1939…more than 2 weeks of unseasonably warm weather made the month the 3rd warmest on record. Seven daily temperature records were set…including the all time record high temperature for the month of 79 degrees on the 5th. Daytime highs were balmy with 14 days in the 60’s and 70’s. Low temperatures dipped to freezing or below on only 5 days. The period was dry with only a trace of snow on the 12th.

3-15

In 1972…a protracted cold spell held an icy grip on metro Denver when maximum temperatures never reached above freezing for 10 consecutive days from the 3rd through the 12th and minimum temperatures dipped below zero on eleven consecutive days from the 5th through the 15th. Daily low temperature records were set with 15 degrees below zero on the 5th…17 degrees below zero on the 6th… And 18 degrees below zero on the 10th. Daily record low maximum readings were set with 3 degrees on the 6th and 6 degrees on the 9th. The very cold temperatures were caused by 3 to 5 inches of snow cover and a Canadian air mass.

9-13

In 1961…cold arctic air produced a protracted cold period. The temperature plunged to 16 degrees below zero on the 10th…establishing a new record for the date and the coldest reading since 25 degrees below zero on February 1… 1951. Low temperatures dipped below zero on 5 consecutive days with 9 degrees below zero on the 9th…16 below on the 10th…10 below on the 11th…and 12 below on both the 12th and 13th. High temperatures reached only 3 degrees on the 10th and 6 degrees on the 11th.

11-13

In 1940…5.4 inches of snow fell across downtown Denver. This was the only snowfall of the month. Temperatures were quite cold on the 13th with a high of 6 degrees and a low of 2 degrees below zero.

In 1984…up to 6 inches of new snow fell over metro Denver… Hampering flight operations at Stapleton International Airport where snowfall totaled 3.8 inches and east winds gusted to 25 mph on the 11th.

12-13

In 1916…snowfall totaled 5.7 inches in downtown Denver. Northeast winds were sustained to 27 mph with gusts to 28 mph on the 12th.

In 1992…an upslope snowstorm whitened metro Denver. While snowfall totaled only 4.1 inches at Stapleton International Airport…7 inches of new snow fell in Morrison…with 12 inches measured in Castle Rock. North winds gusted to 23 mph at Stapleton International Airport on the 13th.

In 1995…strong winds gusting to nearly 100 mph whipped across the foothills west of Denver. The strongest wind gusts included 98 mph atop Squaw Mountain and 75 mph at the Eldora Ski Area. West-northwest winds gusted to 41 mph at Denver International Airport on the 13th.

12-15

In 1921…downslope Chinook winds produced warm temperatures in the city…which resulted in 4 temperature records. High temperatures of 72 degrees on the 13th and 68 degrees on the 15th were record maximums for the dates. Low temperatures of 47 degrees on both the 12th and 13th were record high minimums for the dates. West winds were sustained to 38 mph on the 12th and to 25 mph on the 13th.

In 1955…strong winds raked the foothills. A wind gust to 72 mph was recorded at rocky flats northwest of Denver. Some damage occurred in Boulder. Northwest winds were sustained to speeds of 23 mph at Stapleton Airport.

In 1988…high winds again occurred in Boulder where winds were clocked to 66 mph. West winds gusted to 43 mph at Stapleton International Airport.
13-14 in 1902…heavy snowfall totaled 6.4 inches in the city overnight. North winds were sustained to 18 mph with gusts to 20 mph on the 13th.

In 1925…heavy apparent post-frontal snowfall totaled 7.8 inches across downtown Denver. Northwest winds were sustained to 34 mph with gusts to 42 on the 13th… And north winds were sustained to 33 mph with gusts to 38 mph on the 14th.

In 1951…heavy snowfall totaled 5.9 inches at Stapleton Airport.

In 1987…a snowstorm dropped 2 to 8 inches of snow along the Front Range foothills. Eight to 12 inches fell just south of Denver. Icy streets and highways contributed to many traffic accidents across metro Denver and flights were delayed at Stapleton International Airport where 2.7 inches of snow fell and northeast winds gusted to 17 mph.

In 1991…high winds pummeled metro Denver. Wind gusts to 93 mph were recorded at Rollinsville. Wind speeds across metro Denver were generally 35 to 50 mph. Northwest winds gusted to 48 mph at Stapleton International Airport on the 13th.

In 1926…an intrusion of cold air resulted in temperatures remaining below zero. The high temperature of one degree below zero was a record low maximum for the date. The low temperature was 11 degrees below zero. North winds were sustained to 17 mph.

In 1985…a wind gust to 61 mph was recorded at Table Mesa in Boulder.

In 1996…high winds gusting from 60 to nearly 80 mph moved off the Front Range foothills and over the northeast Colorado plains in the wake of a fast moving cold front. The strongest wind gusts included 79 mph at Golden gate canyon and 70 mph near Table Mesa in southwest Boulder. At Denver International Airport…west-northwest winds gusted to only 39 mph.

14-15

In 1988…a snow storm again whitened metro Denver. Snowfall along the Front Range was in the 6 to 12 inch range. Snowfall totaled 5.8 inches at Stapleton International Airport where north winds gusted to 38 mph.

In 1990…high winds howled across metro Denver behind a strong pacific cold front. Boulder was hardest hit by the high winds. A wind gust to 120 mph was recorded in south Boulder where winds stripped the roof off a garage…a vacant gas station…and a house under construction. Elsewhere in Boulder…several trees were blown down. In Boulder canyon…the winds toppled two cinder block walls on a house under construction. Four Boulder County women were treated for injuries caused by the wind. The injuries were confined to a broken wrist…a mild concussion…bruises…and facial cuts. Two semi-tractor trailers were blown over by the fierce winds south of Boulder. Another truck rollover occurred southeast of Golden. Drivers of all three trucks suffered only cuts and bruises. Several vehicles were trapped in a blinding dust storm on the Denver-Boulder Turnpike near Broomfield. Drivers were forced to stop along the highway for several minutes during the storm and witness their vehicles being pelted with sand and gravel. A wind gust to 97 mph was recorded in Golden. High winds were also reported in Arvada…Boulder…and Lakewood. Winds toppled a number of utility poles and wooden fences…blew out windows…and caused structural damage to a large apartment complex on the west side of Golden. Wind gusts of 70 to 100 mph caused considerable damage to several large billboards north of Golden…as well as damaging the paint…trim…and glass on numerous vehicles in the area. A west wind gust to 51 mph was recorded at Stapleton International Airport.

In 1999…high winds developed in and near the foothills as a strong upper level jet moved into the area. Although most wind gusts were in the 70 to 80 mph range…a weather spotter located 1 mile south of Fritz Peak near Rollinsville measured a peak wind gust to 124 mph. Other wind reports included wind gusts to 77 mph at the National Center for Atmospheric Research in Boulder and atop Blue Mountain and 70 mph at the national wind technology center on Rocky Flats south of Boulder. West winds gusted to only 32 mph at Denver International Airport.

In 2000…high winds developed in the foothills of Boulder County…but winds were strong across all of metro Denver. Winds gusted as high as 72 mph at the National Center for Atmospheric Research on the mesa just southwest of Boulder. West winds gusted to 44 mph at Denver International Airport.

15-16

In 1964…high winds raked metro Denver…causing considerable damage. Wind gusts to 81 mph were recorded at rocky flats northwest of Denver…94 mph at Jefferson County airport near Broomfield…48 mph in downtown Boulder…and 70 mph in Littleton. West wind gusts to 67 mph were recorded at Stapleton International Airport. A man working on construction in downtown Denver died from injuries after being struck by a 5-foot by 8-foot section of plank runway blown by the strong winds. Several people were blown down by the strong winds or hit by flying objects. Buildings… Roads…trees…and power equipment were damaged. Roads were closed east of Denver due to blowing dust.

In 1981…wind gusts to 60 mph were common in the foothills northwest of Denver. West wind gusts to 47 mph were recorded at Stapleton International Airport where the visibility was briefly reduced to 3 miles in blowing dust.

In 1996…strong pre-frontal winds developed in the foothills of Boulder County ahead of an arctic cold front that moved into northeastern Colorado late on the morning of the 16th. Wind gusts of 70 to 75 mph were clocked at Table Mesa in southwest Boulder.

In 1912…northwest winds were sustained to 44 mph with an extreme velocity of 45 mph.

In 1921…north winds were sustained to 46 mph with gusts to 50 mph behind a vigorous cold front. Only a trace of snow fell.

In 1954…a vigorous cold front produced sustained north winds to 45 mph with gusts as high 54 mph. Visibility was reduced to 1 mile in blowing dust at Stapleton Airport.

In 1955…sustained west winds to 44 mph with gusts as high as 58 mph were recorded at Stapleton Airport.

In 1994…a wind gust to 108 mph was recorded atop Squaw Mountain west of Denver with a gust to 92 mph in Rollinsville southwest of Boulder. West winds gusted to 48 mph at Stapleton International Airport.

In 1996…a vigorous arctic cold front moved across metro Denver. Heavy snow and strong winds accompanied the front as near whiteout conditions in snow and blowing snow developed suddenly. Northerly winds gusted from 40 to 60 mph behind the front. Dozens of accidents occurred as roads and highways quickly turned to a glaze of ice. Snowfall amounts ranged from 4 to 6 inches across metro Denver and in the foothills. The exception was at Eldorado Springs south of Boulder where 8 inches of new snow were measured. Snowfall totaled only 1.8 inches at the site of the former Stapleton International Airport. Officially…this was the only measurable snow of the month in Denver. At Denver International Airport…north winds gusted to 34 mph.

In 1999…another brief round of high winds developed in and near the foothills of Boulder County. Peak wind gusts included 83 mph at the National Center for Atmospheric Research near Boulder and 74 mph atop Niwot Ridge and at the National Wind Technology Center on Rocky Flats south of Boulder. West winds gusted to only 33 mph at Denver International Airport where the temperature warmed to a high of 54 degrees.

In 2000…high winds in the mountains spread into the foothills west of Denver. Winds gusted to 87 mph at Georgetown Lake and at the National Center for Atmospheric Research in Boulder. Winds gusted to 72 mph at the national wind technology center south of Boulder.

Continue reading December 13 to December 19: This week in Denver weather history →

Weather History

December 6 to December 12: This week in Denver weather history

December 6, 2015 Thornton Weather Leave a comment

Denver and Colorado are certainly known for their varied weather conditions and as always, looking back at the weather history books highlights that. On these dates we have seen Arctic cold and balmy temperatures in the 70’s. We have seen hurricane force winds and even a rare December thunderstorm. And as one would expect, there has been plenty of snow.

2-17

3-15

4-6

In 1960…heavy snowfall totaled 12.0 inches over the 3 days with 5.1 inches on the 4th…5.2 inches on the 5th…and 1.7 inches on the 6th. Rain changed to snow early on the 4th and ended by early afternoon. Snow started again early on the 5th and continued through midday on the 6th. West northwest winds gusted to 30 mph on the 4th. Post cold frontal temperatures cooled from a high of 38 degrees on the 4th to a low of 7 degrees below zero on the 6th.

5-6

In 1883…a major snow storm hit the city. Heavy snow fell from 10:00 am on the 5th to 7:30 am on the 6th. The amount of snowfall was not recorded…but precipitation from melted snow totaled 1.75 inches…which would give an estimated snowfall of nearly 18 inches. Temperatures during the storm were in the 30’s…so some of the snow May have melted as it fell. However…railroads were blocked and telegraph lines were downed in all directions. Telephone wires and poles were nearly all broken down. The company manager estimated the damage at 30 thousand dollars. Northeast winds were sustained to 24 mph in the city.

In 1892…heavy snow totaled 6.2 inches in downtown Denver. Most of the snow…6.0 inches…fell on the 6th.

In 2001…high winds developed in the foothills northwest of Denver. Winds gusted to 74 mph at aspen springs. West- northwest winds gusted to 35 mph at Denver International Airport…where the temperature warmed to a high of 55 degrees on the 6th.

5-7

In 1978…a major storm dumped heavy snow across metro Denver. At Stapleton International Airport…snowfall totaled 8.5 inches…northeast winds gusted to 46 mph…and temperatures plunged from a high of 49 degrees on the 5th to a low of only 6 degrees on the 6th. Maximum temperature of 6 degrees on the 7th was a new daily record low maximum reading. Most of the snow…6.7 inches…fell on the 5th.

5-8

In 1983…high winds occurred in and near the foothills each day. Wind gusts to 63 mph were registered in Golden Gate Canyon on the evening of the 5th. On the evening of the 6th…winds knocked down trees…snapped power lines…and blew out windows across metro Denver. Gusts were clocked to 102 mph in southwest metro Denver…while wind gusts to 38 mph were recorded at Stapleton International Airport. On the 7th…winds overturned a tractor trailer near Castle Rock. After midnight on the 8th…gusts to 97 mph were reported in southeast Boulder. Wind speeds of 60 to 70 mph were reported in other parts of metro Denver.

In 1939…high temperature of 73 degrees was a record maximum for the date. Low temperature of 44 degrees was a record high minimum for the date.

In 1967…strong west winds produced blowing dust at Stapleton International Airport where a wind gust to 55 mph was recorded. A heavy windstorm caused minor damage in Boulder. In Denver…some structural panels were blown from a building… And the screen of an outdoor theater was severely damaged. There were unofficial reports of wind gusts to 75 mph in metro Denver.

In 1977…wind gusting to 85 mph raked the foothills from Boulder to Morrison. A few houses under construction were blown down. Northwest winds gusted to 39 mph at Stapleton International Airport.

In 1991…high in the atmosphere…a volcanic ash cloud was clearly visible in the direction of the sun during the late morning and early afternoon.

6-7

In 1953…high winds buffeted the eastern foothills. Wind gusts to 80 mph occurred on Lookout Mountain. In Denver winds gusted to 65 mph. Damage in Boulder totaled 15 hundred dollars.

In 1897…west winds were sustained to 53 mph with gusts to 66 mph. The Chinook winds warmed the temperature to a high of 62 degrees…the warmest day of the month.

In 1957…a vigorous cold front produced a dust storm as it moved south across metro Denver. West-northwest wind gusts to 59 mph were recorded at Stapleton Airport where the surface visibility was briefly reduced to 1/2 mile in blowing dust. Light snowfall of only 0.8 inch followed the passage of a secondary Canadian cold front.

In 1958…the worst wind storm in several years caused 10 thousand dollars damage in Boulder where wind gusts were estimated to 75 mph.

In 1977 winds up to 115 mph were reported in the Boulder area where one house was unroofed and another damaged. One woman was knocked down by the wind and injured. Several families were evacuated from homes in Boulder. Damage to trailers and motor vehicles was widespread. West winds gusted to 54 mph at Stapleton International Airport where the Chinook winds warmed the temperature to a high of 64 degrees.

In 1987…strong winds buffeted the Front Range foothills. A peak gust to 93 mph was recorded at the National Center for Atmospheric Research in Boulder. Nearby…a metal shed was blown over a fence into a tree two houses away. Wind gusts of 70 to 80 mph were common in Boulder.

In 1988…4 to 8 inches of snow fell across metro Denver and caused traffic gridlock conditions on area highways. The 3.9 inches of snow at Stapleton International Airport caused two-hour flight delays. Northeast winds gusted to 25 mph.

In 2005…a brief cold snap resulted in record breaking temperatures. The low temperature of 13 degrees below zero was a record minimum for the date. The high temperature of only 3 degrees was a record low maximum for the date. The cold temperatures were accompanied by 1.4 inches of light snow that was measured at Denver Stapleton overnight on the 6th and 7th.

7-9

In 1919…an apparent arctic cold front brought extreme cold and light snow to the city. Snowfall totaled only 2.5 inches on the 7th and 8th. Temperatures dipped to lows of 14 degrees below zero on the 8th and to 20 degrees below zero on the 9th. Both readings were daily record minimums. High temperatures were only 4 degrees on the 8th and 7 degrees on the 9th.

In 1923…a major storm dumped 13.5 inches of snowfall on downtown Denver. The apparent post-frontal snowfall started during the late afternoon of the 7th and continued through the evening of the 9th. Temperatures dipped from a high of 66 degrees on the 7th with west winds sustained to 35 mph to a low of only 14 degrees on the 9th…with north winds sustained to 25 mph.

In 1880…severe winds buffeted the eastern foothills…causing some damage in Boulder.

In 1987…high winds damaged a chimney and roof of a house near Bergen Park in the foothills west of Denver. Gusts were estimated to 70 mph. Northwest winds gusted to 33 mph at Stapleton International Airport.

8-9

In 1943…4.5 inches of snow fell in downtown Denver. This was the only measurable snow of the month. North winds were sustained to 26 mph on the 8th.

In 2003…snowfall totaled 3 to 6 inches across metro Denver. Snowfall was heavier in and near the foothills with 8.0 inches measured in Boulder and 10 miles southwest of Sedalia. Snowfall was 3.9 inches at the site of the former Stapleton International Airport. Most of the snow fell on the 8th…as the snow ended shortly after midnight. North winds gusted to 29 mph at Denver International Airport.

In 2008…an upslope snowstorm produced heavy snow in and near the foothills of Boulder…Jefferson and Douglas counties… And along the palmer divide south of Denver. Storm totals in the foothills ranged from 8 to 15 inches. In Boulder and in areas west and south of Denver…storm totals ranged from 6 to 13 inches. The snowfall measurement at Denver International Airport was 3.9 inches.

8-10

In 1985 a slow moving storm dumped 10 to 20 inches of snow over the northeast plains…closing schools and businesses in many areas along the Front Range north of Denver. At Stapleton International Airport…snowfall totaled 9.9 inches with a maximum snow depth of 7 inches on the ground. North winds gusted to 24 mph. The snow caused long air traffic delays at Stapleton International Airport on the 9th.

In 1997…persistent light to moderate snowfall combined with strong and gusty northerly winds to produce much blowing and drifting snow across metro Denver. The hardest hit areas were south of Denver where north winds at speeds of 20 to 35 mph with gusts to 45 mph caused near whiteout conditions. The strong winds produced drifts 2 to 4 feet deep and dropped wind chill temperatures well below zero. Sections of both I-25 and I-70 and other roads were closed as travel became impossible due to blowing snow. Numerous traffic accidents were reported and a handful of people were stranded during the snowstorm. Snowfall totals included: 22 inches at Conifer…13 inches at Castle Rock…12 inches at Parker…and 8 inches in southeast Aurora. Snowfall totaled 5.5 inches at the site of the former Stapleton International Airport. North winds gusted to 36 mph at Denver International Airport on the 10th.

8-12

In 1932…the second longest sub-zero period on record in Denver occurred. The temperature fell below zero shortly after 1:00 pm on the 8th and remained below zero for 92 hours until 9:00 am on the 12th. The lowest temperature recorded during this period was 13 degrees below zero on both the 9th and 11th. That temperature on the 11th was a record low for the date. High temperatures of 4 on the 8th…5 below zero on the 9th…1 below zero on the 10th… And 6 below zero on the 11th were record low maximum temperatures for those dates. Light north winds at 5 to 10 mph were accompanied by occasional light snow…which totaled only 2.2 inches.

In 1898…the very cold air mass that settled over the city behind an apparent cold front on the 7th plunged temperatures to a low of 20 degrees below zero. The high temperature climbed to only 5 degrees.

In 1910…Chinook west winds sustained to 46 mph warmed the temperature to 60 degrees…the warmest reading of the month that year.

In 1919…the minimum temperature dipped to 20 degrees below zero in downtown Denver…setting a record low for the date.

In 1984…high winds occurred in the foothills with a gust to 69 mph recorded at Golden Gate Canyon west of Denver. West winds gusted to 36 mph at Stapleton International Airport.

In 1992…high winds were recorded over most of the day in the Front Range foothills. Wind gusts to 95 mph were measured in the Table Mesa area of Boulder. Northwest winds gusted to 43 mph at Stapleton International Airport.

In 1993…a weather observer in Boulder recorded a wind gust to 73 mph. North winds gusted to 37 mph at Stapleton International Airport.

In 1998…metro Denver and areas in the foothills received the first significant snowfall in more than a month. The upslope snow event deposited up to 17 inches in the foothills with generally 4 to 8 inches across metro Denver west of I-25. Snowfall totals included 17 inches at crescent park and 16 inches in nearby Coal Creek Canyon. Other snow amounts included: 16 inches at tiny town; 14 inches at Chief Hosa…Evergreen…and Genesee; 13 inches in Conifer; 12 inches at Nederland; 11 inches in Eldorado Canyon; 9 inches just west of Boulder; 8 inches in Boulder; and 7 inches in Broomfield and Golden. Only 3.6 inches of snow fell at the site of the former Stapleton International Airport. Northeast winds gusted to 26 mph at Denver International Airport.

9-13

In 1953…snowfall totaled 3.8 inches at Stapleton Airport where northeast winds were sustained at speeds to 47 mph and gusted to 60 mph behind a cold front.

In 1969…sustained winds of 30 mph with gusts to 55 mph in downtown Boulder caused minor damage. Northwest winds gusted to 39 mph at Stapleton International Airport.

In 1980…winds to 60 mph whistled through Boulder.

In 1987…strong winds in the foothills spread over northern portions of metro Denver. Wind gusts of 60 to 75 mph were common in Boulder and southwestern weld counties. However… The highest reported wind gust…94 mph…occurred near Rollinsville. A northwest wind gust to 36 mph was recorded at Stapleton International Airport.

10-11

In 1933…downslope winds produced warm temperatures…resulting in record high minimums of 46 degrees on the 10th and 44 degrees on the 11th. High temperatures of 66 degrees on the 10th and 62 degrees on the 11th were not records. Southwest winds were sustained to 16 mph on the 10th.

In 1939…high temperatures of 70 degrees on the 10th and 74 degrees on the 11th were record maximums for the dates. The low temperatures of 39 degrees on the 10th and 41 degrees on the 11th were not records.

In 1948…high winds in Boulder and Louisville caused 1750 dollars in damage. Wind gusts in excess of 70 mph were reported at Valmont and Boulder airport. Chinook wind gusts to 60 mph briefly reduced the visibility to 1/4 mile in blowing dust at Stapleton Airport.

In 1989…the season’s greatest snowfall to date hit metro Denver with 6 to 12 inches of snow. Flight delays at Stapleton International Airport reached 2 hours. Multiple wrecks snarled traffic on I-25 both north and south of the city. Snowfall totaled 7.0 inches at Stapleton International Airport where north winds gusted to 25 mph on the 10th.

In 1938…snowfall totaled 3.7 inches in downtown Denver. North winds were sustained to 21 mph with an extreme velocity to 22 mph.

In 1967…wind gusts to 58 mph in downtown Boulder caused minor damage. Northwest winds gusted to 47 mph at Stapleton International Airport.

In 1980…winds to 60 mph were reported in Boulder. Northwest winds gusted to 23 mph at Stapleton International Airport. The Chinook winds warmed temperatures to a high of 67 degrees.

In 1994…strong gusty winds occurred along the Front Range eastern foothills. A wind gust to 67 mph was recorded in Boulder with a gust to 58 mph measured at Jefferson County airport near Broomfield. No damage was reported. Northwest winds gusted to 31 mph at Stapleton International Airport.

11-12

In 1903…a sharp cold front on the 11th plunged temperatures from a high of 59 degrees to a low of 15 degrees…produced northeast winds sustained to 42 mph along with gusts as high as 60 mph…and produced 1.3 inches of snow overnight. The high temperature on the 12th was only 25 degrees.

In 1968…strong winds buffeted the eastern foothills and plains and caused light…but widespread property damage. Wind gusts of 50 to 75 mph were reported. West winds gusted to 52 mph at Stapleton International Airport.

11-13

In 1940…5.4 inches of snow fell across downtown Denver. This was the only snowfall of the month. Temperatures were quite cold on the 13th with a high of 6 degrees and a low of 2 degrees below zero.

In 1937…a thunderstorm…rare in December…produced 0.09 inch of rain in advance of a cold front.

In 1973…high winds occurred across all of metro Denver with the foothills area being hit the hardest. A wind gust to 120 mph was recorded in Boulder where damage to residences…mobile homes…fences…and buildings totaled 100 thousand dollars. A northwest wind gust to 66 mph occurred at Stapleton International Airport.

In 1988…strong winds were recorded in Boulder. Peak wind gusts reached 70 mph at Table Mesa and 61 mph in east Boulder. West winds gusted to 31 mph at Stapleton International Airport.

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In 1916…snowfall totaled 5.7 inches in downtown Denver. Northeast winds were sustained to 27 mph with gusts to 28 mph on the 12th.

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ThorntonWeather.com

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