Category Archives: Weather History

News and related items pertaining to national, Colorado, Denver and Thornton weather.

February 13 to February 19: This Week in Denver Weather History

This Week in Denver Weather History

High winds and wintry weather highlight our look back at this week in Denver weather history.  Among the notable events is Denver’s longest continuous period of snow cover – 61 days – that occurred just four years ago.

From the National Weather Service:

10-13

In 1905…an extremely cold arctic air mass moved over the city behind a cold front on the 10th and persisted through the morning of the 13th.  North winds were sustained to 25 mph behind the front on the 10th dropping the temperature to a low of 2 degrees below zero…which was also the high reading on the 11th.  Light snowfall totaled 3.0 inches overnight of the 10th into the 11th.  The low temperature plunged to 19 degrees below zero on the 11th.  Records were set on the 12th and 13th.  The high temperature of only zero degrees on the 12th was a record low maximum for the date.  The low readings of 21 degrees below zero on the 12th and 14 degrees below zero on the 13th were record minimum temperatures for those dates.

11-13

In 1903…west to northwest Chinook winds gusting to 34 mph warmed the temperature to a high of 50 degrees on the 11th… Before temperatures rapidly plunged to a low of 14 degrees behind a cold front.  Light snow fell through the 13th and totaled 4.2 inches in the city…while temperatures ranged from a high of 14 degrees on the 12th to a low of 5 degrees below zero on the 13th.

12-13

In 1915…heavy snowfall totaled 7.0 inches over downtown Denver.  Northwest winds were sustained to 24 mph on the 13th.

In 1951…heavy snowfall totaled 8.1 inches at Stapleton Airport where northeast winds gusted to 28 mph on the 12th.

In 1968…snowfall totaled 5.6 inches at Stapleton International Airport where northeast winds gusted to 26 mph.  Snow fell all day on the 12th and into the morning hours of the 13th.

In 1997…heavy snow fell in the foothills southwest of Denver.  Conifer…Evergreen…Morrison…and north turkey creek received 6 to 8 inches of new snow overnight. Only 0.2 inch of snow fell at the site of the former Stapleton International Airport.  North-northeast winds gusted to 23 mph at Denver International Airport on the 13th.

13

In 1886…northwest winds were sustained to 40 mph during the early morning hours…but winds were strong and gusty all day.

In 1918…west winds were sustained to 42 mph with a measured extreme velocity to 44 mph.  The strong Chinook winds warmed the temperature to a high of 58 degrees.

In 1988…high winds raked metro Denver.  Boulder reported a wind gust to 67 mph with 63 mph at Lakewood and 49 mph at Stapleton International Airport.  The strong winds toppled a tree onto a car in Aurora.  Northwest winds gusting to 49 mph at Stapleton International Airport warmed the temperature to a high of 64 degrees.

In 2010…a peak wind gust to 89 mph was recorded in Boulder. North winds gusted to 28 mph at Denver International Airport.

13-14

In 1895…a cold air mass settled over the city.  High temperatures of only 4 degrees on the 13th and 8 degrees on the 14th were record low maximum temperatures for each day.  Low temperatures were 6 degrees below zero on the 13th and 5 degrees below zero on the 14th…but were not records.  Light snow totaled only 0.4 inch.  Winds were light.

In 1960…snowfall totaled 6.1 inches and north-northwest winds gusted to 39 mph at Stapleton Airport.

In 1967…high winds were widespread along the foothills where wind gusts of 60 to 90 mph were common.  A wind gust to 108 mph was measured at the National Center for Atmospheric Research in Boulder.  Sustained winds of 50 to 55 mph with gusts as high as 70 mph were recorded in downtown Boulder. An estimated 3 thousand dollars in damage occurred to mobile homes in Boulder.  Power lines were downed over a wide area.  At Stapleton International Airport…west winds gusted to 32 mph on the 13th and southwest winds gusted to 48 mph on the 14th.

In 1972…winds gusted to 67 mph at the National Bureau of Standards in Boulder.  Wind gusts to 49 mph were measured in downtown Boulder.  West winds gusted to 26 mph at Stapleton International Airport.

In 2001…heavy snow fell across metro Denver and in the foothills.  Snowfall totals included:  8 inches at Evergreen; 7 inches atop Crow Hill and in Lakewood; 6 inches in Denver…doubleheader…Eldorado Springs… Morrison…and pine junction.  Snowfall totaled 4.8 inches at the site of the former Stapleton International Airport. Northeast winds gusted to 33 mph at Denver International Airport on the 13th.

14

In 1918…southwest winds were sustained to 41 mph with a measured extreme velocity to 46 mph.

In 1987…metro Denver received only 3 to 4 inches of snow… But the foothills west of Boulder received up to 11 inches of snow.  Snowfall totaled 4.2 inches at Stapleton International Airport where north winds gusted to 31 mph.

In 1988…winds gusted to 81 mph at Echo Lake.

In 2002…high winds developed in the Front Range foothills during the early morning hours.  Winds gusted to 84 mph… 11 miles north of Central City.  West winds gusted to 43 mph at Denver International Airport.
14-15 in 1960…heavy snowfall totaled 6.1 inches at Stapleton Airport.

In 1965…5.4 inches of snow fell at Stapleton International Airport behind a cold front.  North-northeast winds gusted to 32 mph.  Winds were strong and gusty all day and caused considerable blowing snow…contributing to hazardous driving conditions mainly to the east of Denver.

In 1984…a snow and wind storm howled across eastern Colorado closing I-70 east of Denver.  This was the second blizzard in less than 4 days.  Only 0.5 inch of new snow fell at Stapleton International Airport…but north winds gusted to 51 mph.

Continue reading February 13 to February 19: This Week in Denver Weather History

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

This Week in Denver Weather History

Cold, snow and wind mark this week in our look back at Denver weather history.  Numerous notable events including a period of 69 hours when the temperatures remained below zero – the fourth longest on record.

30-7

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.

31-8

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.

31-12

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.

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 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.

4-6

In 1986…10 inches of snow fell in Boulder…in the foothill town of Wondervu southwest of Boulder…and at Evergreen west of Denver.  Snowfall totaled 2.4 inches at Stapleton International Airport…where north winds gusted to 20 mph on the 6th.

5-6

In 2003…heavy snow fell in the foothills.  Snowfall totals included:  17 inches at Genesee; 16 inches at Lookout Mountain; 11 inches at Chief Hosa near Indian Hills…and 7 miles southwest of Boulder; 10.5 inches atop Gold Hill; and 10 inches at Intercanyon and near Conifer.  Only 2.2 inches of snowfall were measured in the city at the site of the former Stapleton International Airport.

5-11

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.

6

In 1899…the temperature dipped to a low of 22 degrees below zero.

6-7

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.

6-10

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.

7

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.

7-8

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.

Continue reading February 6 to February 12: This week in Denver weather history

January 30 to February 5: This week in Denver weather history

This Week in Denver Weather History

The end of January and the first week of February have historically been an active period in Denver weather.  We see many high wind events which are common this time of year as well as the usual snowstorms.  Given the extreme cold we are set to experience this week, one event 22 years ago serves as a timely reminder of the dangers of cold.  In 1989 one Arctic cold event turned deadly and dangerous.

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.

27-31

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.

28-30

In 1887…winds were strong and gusty for three days in the city.  West and northwest winds were sustained to 56 mph on both the 28th and 29th and to 44 mph on the 30th. Temperatures warmed to a high of 57 degrees on the 29th.

29-30

In 1985…an arctic air mass with snow closed I-70 for a time in Denver and east of Denver.  Snowfall totaled 5.4 inches at Stapleton International Airport where north winds gusted to 29 mph on the 29th.

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.

30

In 1886…west winds were sustained to 42 mph and were the strongest winds of the month that year.  The winds warmed the temperature to a high of 52 degrees in the city.

In 1890…west winds were sustained to 40 mph with gusts to 48 mph in the city.

In 1971…a wind gust to 102 mph was recorded in Boulder at the National Center for Atmospheric Research.  Elsewhere in Boulder…winds gusted to 76 mph.  Northwest winds gusting to 46 mph at Stapleton International Airport warmed temperatures to a high of 66 degrees.

In 1976…a rapid moving cold front produced wind gusts 50 to 70 mph causing visibilities to be reduced to less than 1/2 mile in blowing dust for 1 to 2 hours closing some major highways.  A north wind gust to 55 mph was recorded at Stapleton International Airport.

In 2003…strong winds developed in and near the foothills. Recorded wind gusts included:  86 mph near Rollinsville… 76 mph in Evergreen…and 75 mph in central Boulder. West winds gusted to 43 mph at Denver International Airport.

30-31

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 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.

31

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.

Continue reading January 30 to February 5: This week in Denver weather history

January 23 to January 29: This week in Denver weather history

This Week in Denver Weather History

When Denver’s weather turns severe it can turn deadly and damaging.  As we look back at this week in Denver weather history we see a time when extreme cold claimed a life and many occasions where wind wreaked havoc and caused damage.

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.

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.

22-23

In 1982…wind gusts up to 101 mph were clocked at Wondervu. Wind gusts of 60 to 80 mph were common along the Front Range foothills from Boulder north.

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.

23

In 1872…a brisk northerly wind set in about noon…blew almost a gale about 6:00 pm…and continued brisk until night.  A light snow commenced during the late afternoon and continued all night.

In 1886…northwest winds were sustained to 40 mph in the city around sunrise.  A cold wave accompanied the strong winds.

In 1897…a vigorous cold front produced northeast winds sustained to 45 mph with gusts to 50 mph.  Temperatures plunged from a high of 59 degrees to a low of 11 degrees in the evening.  The very cold temperatures persisted through the 28th.

In 1934…the date marked the last day of the longest period of consecutive days without measurable precipitation in the city.  The 52 day period began on December 3…1933.

In 1988…one of the strongest windstorms in several years pounded the Front Range foothills from Colorado Springs north to the Wyoming border.  The highest wind gust at lower elevations was 105 mph recorded at Table Mesa in Boulder.  Other sections of Boulder recorded wind gusts of 80 to 90 mph.  In Boulder…the high winds broke windows and damaged power lines and transformers.  Power outages were widespread and traffic lights were downed.  The winds blew down a partially constructed viaduct in east Boulder.  Nine unanchored concrete girders…each weighing 45 tons…were blown off their supports.  Cars were blown off I-70 near Morrison…and a tractor trailer and a mobile home were knocked over.  In Lakewood…an electric company crewman was burned while replacing a power line.  Wind gusts to 92 mph were clocked at Jefferson County Airport in Broomfield before the site anemometer was blown down by the wind. The strong winds spread over all the metro area with a northwest wind gust to 52 mph recorded at Stapleton International Airport.

In 1992…high winds buffeted the eastern foothills.  A wind gust to 63 mph was recorded at Rocky Flats northwest of Denver.  West winds gusted to 40 mph at Stapleton International Airport.

In 2002…low level upslope flow combined with an upper level jet stream created bands of heavy snow over portions of the Front Range foothills and metro Denver.  The areas hardest hit were the foothills of Jefferson and Douglas counties and the I-25 corridor from the southern suburbs of Denver to around Castle Rock.  Snow totals included: 9 inches at Intercanyon…Roxborough state park…and near Sedalia; 8.5 inches atop Crow Hill and near tiny town; 8 inches at Ken Caryl and near Castle Rock; 7 inches in Lakewood; 6.5 inches at Littleton; and 6 inches in Castle Rock.  Only 3.6 inches of snow were measured at the site of the former Stapleton International Airport.

23-24

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.

24

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.

Continue reading January 23 to January 29: This week in Denver weather history

January 16 to January 22: This week in Denver weather history

This Week in Denver Weather History

Our look back at this week in Denver weather history carries with it one overriding condition – wind.  In January it is not uncommon for us to experience Chinook winds which are a blessing and a curse.  These winds bring warm temperatures which are welcome in our coldest month of the year.  However they also can run at extraordinary speeds and at their worst cause a great deal of damage.

13-16

In 1888…a cold air mass settled over the city and caused temperatures to plunge well below zero on four consecutive days…but only one temperature record was set.  Minimum temperatures dipped to 4 degrees below zero on the 13th… 19 degrees below zero on the 14th…20 degrees below zero on the 15th…and 11 degrees below zero on the 16th.  The maximum temperature of only 4 degrees below zero on the 14th was a record low maximum for the date.  North winds were sustained to 30 mph on the 13th.

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.

15-16

In 1967…a major windstorm struck Boulder.  The storm was described at the time as the worst single windstorm in the history of Boulder in terms of damage.  Winds reached 125 mph at the National Center for Atmospheric Research and at Boulder airport.  Winds gusted to 84 mph downtown.  Damage totaled a half million dollars in Boulder where some minor injuries were reported.  At the Boulder municipal airport… 14 light airplanes were severely damaged.  The second floor of a warehouse was blown down…damaging two nearby moving vans.  A mobile home was blown over south of Boulder… Injuring one woman.  The roof of a department store was blown in.  There was widespread damage to houses…autos… And power lines from wind and flying debris.  Strong winds also occurred in Denver and Golden…but damage was only minor.  At Stapleton International Airport…west winds gusted to 43 mph on the 15th and to 45 mph on the 16th.

In 1981…heavy snow of 6 to 10 inches accumulated across metro Denver.  Snowfall totaled only 1.8 inches at Stapleton International Airport where east winds gusted to 21 mph on the 15th.

In 1991…a Pacific storm system moved across metro Denver. Snowfall totaled 3 to 7 inches with 3 inches in Aurora… Denver…and Castle Rock…4 inches in Arvada…and 7 inches at South Platte station just southwest of Denver. Snowfall totaled only 2.9 inches at Stapleton International Airport where north winds gusted to 21 mph on the 16th.

In 2001…heavy snow fell across the Front Range foothills and urban corridor.  The combination of careless driving and snowpacked highways resulted in 3 multi-vehicle accidents involving 30 vehicles…along I-25 in Douglas County.  Eleven people were injured and one was killed. Snow amounts included:  11 inches in Evergreen; 10 inches at Eldorado Springs and Genesee; 8 inches at Broomfield… Ken Caryl Ranch…and Thornton; and 5 to 7 inches in Arvada…Bailey…Crow Hill…Gross Reservoir…Lakewood… Louisville…Westminster…and near Loveland.  Snowfall totaled 2.7 inches at the site of the former Stapleton International Airport.

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

In 1911…a trace of rain fell…a rare event in January.

In 1935…rainfall was 0.01 inch during the afternoon…a rare event in January.

In 1989…wind gusts to 80 mph were reported in southwest Boulder.  Winds reached 100 mph at Rollinsville in the foothills southwest of Boulder.  In Golden…the wind blew a 25-foot trailer through a fence and flipped it over. West winds gusted to 37 mph at Stapleton International Airport where the Chinook winds warmed the temperature to a high of 49 degrees.

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.

17

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.

Continue reading January 16 to January 22: This week in Denver weather history

January 9 to January 15: This week in Denver weather history

This Week in Denver Weather History

Winds along the Front Range this time of year can be a blessing and a curse all at once.  Chinook’s can warm temperatures well above what they normally would but they can also cause a great deal of damage when they are at their hardest.  We see these contrasts 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.

8-9

In 1891…heavy dry snowfall totaled 9.7 inches over downtown Denver.  Most of the snow…6.5 inches…occurred on the 8th when north winds were sustained to 12 mph with gusts to 20 mph.

In 1939…heavy snowfall totaled 6.7 inches in downtown Denver. The snowfall was the heaviest overnight…particularly during the early morning hours.  The moist snow adhered to the north side of the instrument shelter and other objects to a depth of 2 inches.  Snow accumulated on fences and trees to several inches.  This was the greatest snowfall of the month that year.  The greatest depth on the ground was 6.5 inches.  North to northwest winds were sustained to 24 mph on the 8th and to 27 mph on the 9th.

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

In 1875…the all time lowest recorded official temperature in Denver…29 degrees below zero…occurred between 3:00 am and 4:00 am under clear skies with calm winds.  The temperature climbed to zero at noon and to a high of 8 degrees at 3:00 pm.

In 1916…Chinook winds from the southwest sustained to 42 mph with gusts as high as 48 mph warmed the temperature to a high of 57 degrees.

In 1917…Chinook winds…southwesterly in direction…sustained at 43 mph with gusts to 48 mph warmed the temperature to a high of 55 degrees.  The low temperature was only 43 degrees.

In 1950…strong west winds to 50 mph produced blowing dust… Which briefly reduced visibility to 3/4 mile at Stapleton Airport.

In 1957…west-northwest winds gusted to 51 mph at Stapleton Airport.

In 1988…a wind gust to 61 mph was recorded at Echo Lake. West winds gusted to only 16 mph at Stapleton International Airport.

In 1989…strong Chinook winds howled along the eastern foothills.  A peak gust to 115 mph was recorded at the Boulder airport where a light plane was severely damaged when the wind flipped it over.  Gusts reached 103 mph at Table Mesa in south Boulder.  Homes in the city suffered damage to roofs…gutters…and siding.  Fences were blown down…and windows in both homes and cars were broken.  A radio station was off the air for 2 1/2 hours when the winds blew the top 80 feet off its 180-foot transmission tower.  A school roof was partially torn off…and a few traffic signals were downed.  Winds 60 to 80 mph were reported at Jefferson County Airport in Broomfield. West winds gusted to 47 mph at Stapleton International Airport.

In 1990…high winds buffeted the Front Range foothills for a second straight day.  Wind gusts to 92 mph were recorded at Rollinsville.  Wind gusts of 65 to 90 mph were noted in the Denver-Boulder area.  No significant damage occurred. Northwest winds gusted to 38 mph at Stapleton International Airport where the maximum temperature reached 63 degrees.

In 2017…high winds developed in and near the Front Range Foothills. Peak wind gusts included: 90 mph near Pleasant View; 88 mph near Louisville; 87 mph near Gold Hill; 79 mph at the NCAR Mesa Laboratory; 76 mph at Glen Haven; 60 mph in Littleton and 58 mph in Arvada. Scattered outages affected approximately 2400 customers in Boulder and Jefferson Counties. In Berthoud…strong winds destroyed a barn. At Denver International Airport…a peak wind gust of 56 mph from the northwest was recorded.

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.

10

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.

Continue reading January 9 to January 15: This week in Denver weather history

January 2 to January 8: This week in Denver weather history

This Week in Denver Weather History

Certainly cold and snow are to be expected in Denver in January and our look back at this week in Denver weather history has plenty notable events with those conditions.  However, as we pointed out in our January weather preview, oftentimes it is the wind that is the real story.  Powerful Chinook winds appear during the month and we see the damaging – and sometimes deadly – results when we look back in time.

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.

1-2

In 1896…warm Chinook winds on the 1st became cold Bora winds on the 2nd.  Southwest winds sustained to 60 mph with gusts as high as 66 mph warmed the temperature to a high of 55 degrees on the 1st.  Northwest winds sustained to 54 mph with gusts to 60 mph resulted in snowfall of 0.3 inch and a high temperature of only 31 degrees on the 2nd.

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

In 1972…strong northwest Chinook winds in advance of a cold front gusted to 51 mph at Stapleton International Airport and caused temperatures to warm to a high of 55 degrees.

In 1986…high winds occurred along the Front Range foothills. The strongest recorded gust was 82 mph in the Table Mesa area of Boulder.  Other places in Boulder reported gusts from 68 to 80 mph.  West winds gusted to 43 mph at Stapleton International Airport.

In 1989…high winds between 60 and 70 mph were recorded in Boulder and along the eastern foothills.  No damage was reported.  West winds gusted to 49 mph at Stapleton International Airport.

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.

Continue reading January 2 to January 8: This week in Denver weather history

December 26 to January 1: This week in Denver weather history

This Week in Denver Weather History

Winter wind in Colorado can be quite nasty oftentimes reaching damaging levels and we see numerous occurrences of that in our look back at this week in Denver weather history.  Also notable are storm system just a few years ago in 2006 and 2007 that dumped a good amount of snow on the Denver area.

25-26

In 1904…after a warm Christmas Day with a high temperature of 50 degrees…a late day cold front plunged temperatures to a low of 7 degrees…produced northeast winds sustained to 40 mph with gusts to 54 mph…and produced 5.2 inches of snow overnight for a late white Christmas.  The maximum temperature on the 26th was only 16 degrees.

In 2014…a winter storm brought a rare Christmas Day snowfall to the Front Range Foothills and Urban Corridor… from the afternoon of the 25th to the evening of the 26th. Storm totals included: 12.5 inches…4 miles west of Boulder; 12 inches…4 miles southwest of Eldorado Springs and 4 miles south of Golden; 11 inches at Genesee; 10 inches near Allenspark…5 miles west of Chatfield Reservoir…5 miles southwest of Golden and near Tiny Town; 8 inches in Lakewood and Louisville; 7.5 inches in Niwot; 7 inches in Longmont; with 6 inches in Broomfield and Frederick. At Denver International Airport…5.1 inches of snowfall was observed.

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

In 1877…heavy snow fell during the early morning and totaled nearly 6 inches.  Precipitation from melted snow was 0.58 inch.  After the snowfall…a number of sleighs were seen on the city streets.

In 1879…after a morning low of 4 degrees below zero… The temperature climbed to a high of 57 degrees in the city.

In 1907…west winds were sustained to 40 mph.  The Chinook winds warmed the temperature to a high of 62 degrees.

In 1949…west winds gusted to 50 mph at Stapleton Airport.

In 1998…intense…but localized…downslope high winds developed near Wondervu in the foothills southwest of Boulder.  Winds frequently gusted to 100 mph with a highest reported wind gust to 104 mph.  West winds gusted to only 43 mph at Denver International Airport.

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.

27

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.

Continue reading December 26 to January 1: This week in Denver weather history

December 19 to December 25: This week in Denver weather history

This Week in Denver Weather History

Cold and snow dominate our look at the week leading up to the Christmas holiday.  Certainly the infamous Christmas Eve Blizzard of 1982 is the one event that most long-time resident will remember as it was truly one for the history books.  Also notable was a cold front that moved through in 1988 that dropped temperatures well below zero and was responsible for at least five deaths.

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.

18-19

In 2012…a storm system brought moderate to heavy snow to the mountains and foothills west of metropolitan Denver and blizzard conditions to plains east of Denver metro area. The combination of snow and wind reportedly reduced visibility to just a few hundred feet at times…and resulted in several road closures including Interstate 70 east of Aurora. East of Denver gusty northerly winds ranged from 35 to 55 mph produced extensive blowing and drifting snow…ranging from 1 to 4 feet in depth. Storm totals ranged from 3 to 5 inches. In the mountain and foothills…the heaviest snowfall occurred along and north of I-70 and included: 12 inches at Genesee…9 inches near Eldorado Springs; 8.5 inches at Coal Creek Canyon…8 inches near Evergreen…with 6 inches at Eldora Ski Area…Idaho Springs…Gross Reservoir and Nederland. At Denver International Airport…1.7 inches of snowfall was observed. In addition…a peak wind gust to 35 mph was observed from the north on the 19th.

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 Amtrack 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

In 1913…post-frontal heavy snowfall totaled 8.5 inches over downtown Denver.  North winds were sustained to only 16 mph.

In 1994…an intense pacific storm system and associated cold front moved across Colorado early in the day.  Strong downslope winds buffeted the Front Range eastern foothills. The highest wind gust recorded was 92 mph at Rocky Flats in northern Jefferson County.  Most of the wind gusts during the day ranged from 63 to 86 mph with lighter gusts of 40 to 58 mph on the northeast plains.  The strong winds downed power lines and poles in south Lakewood…causing power outages to 2400 homes.  Other small power outages and surges occurred across metro Denver.  Northwest winds gusted to 43 mph at Stapleton International Airport.

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.

20

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.

20-22

In 1933…strong downslope winds produced a warm spell. Low temperatures of 43 degrees on both the 20th and 21st and 41 degrees on the 22nd were record high minimums for those dates.  High temperature of 67 degrees on the 21st was a record maximum for the date.  High temperatures of 56 degrees on the 20th and 69 degrees on the 22nd were not records; however…the 69 degrees was the warmest of the month.  West to northwest winds were sustained to 20 and 24 mph on the 21st and 22nd respectively.

20-23

In 1918…light snowfall on each day totaled 12.0 inches over downtown Denver.  Northeast winds were sustained to 16 mph on the 21st.

Continue reading December 19 to December 25: This week in Denver weather history

December 12 to December 18: This week in Denver weather history

This Week in Denver Weather History

We all know weather can be dangerous but usually we don’t associate that with winter weather conditions.  However, our look in Denver weather history for this week shows that the common winter conditions of wind and cold can not only cause injure, it can lead to death.

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.

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.

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.

11-12

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 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

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.

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.

13

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.

Continue reading December 12 to December 18: This week in Denver weather history