December 9 to December 15: This week in Denver weather history
Heavy snow and damaging wind are at the forefront of our look back at this week in Denver weather history.
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.
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.
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.
9
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 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.
10
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.
December 2 to December 8: This Week in Denver Weather History
This week has historically been an extremely eventful one in Denver with many notable weather events, most of which are snow or wind related. The most significant event occurred 99 years ago when the city received its biggest snowstorm on record – an astonishing 45.7 inches. Details on that event and many others are below.
From the National Weather Service:
30-2
In 1975…very strong Chinook winds up to 100 mph caused damage to homes…aircraft…aircraft hangars…mobile homes… Cars…and power lines along the eastern foothills. Strong northwest winds gusted to 39 mph at Stapleton International Airport on both the 30th and the 1st.
1-2
In 1933…apparent post-frontal heavy snowfall totaled 8.0 inches across downtown Denver. North winds were sustained to 17 mph with an extreme velocity to 18 mph on the 1st.
In 1981 strong winds gusted to over 70 mph along the foothills. A peak gust to 100 mph was recorded at Wondervu. A gust to 94 mph was recorded just west of Boulder. Roofs on houses were damaged in the Evergreen area…and some mobile homes also were damaged. At Stapleton International Airport…northwest winds gusted 44 mph on the 1st and 37 mph on the 2nd.
1-5
In 1913…the 1st marked the start of the heaviest 5-day total snowfall in the city’s history. During this period snowfall totaled 45.7 inches. Starting on the 1st…snow fell intermittently for 3 days and accumulated a little over 8 inches. On the 4th and 5th…an additional 37.4 inches of snow fell. At Georgetown in the foothills west of Denver even more snow fell…86 inches over the 5 days with the most…63 inches…on the 4th. In Colorado…snowfall was heavy along the eastern slopes of the mountains from the palmer divide north. High winds during the storm caused heavy drifting…which blocked all transportation. Snow cover of an inch or more from the storm persisted for 60 consecutive days from the 1st through January 29…1914. Additional snowfall in December and January prolonged the number of days. This is the third longest period of snow cover on record in the city.
2
In 1893…northwest winds were sustained to 42 mph with gusts to 46 mph. Snowfall was only 1.4 inches in the city.
In 1895…0.01 inch of melted snow from 0.7 inch of snowfall was the only measurable precipitation of the month in downtown Denver…ranking the month the 3rd driest December on record.
In 1899…post-frontal northeast winds sustained to 44 mph with gusts to 59 mph caused the temperature to plunge from a high of 55 degrees to a low of 15 degrees. Snowfall was only 1.0 inch.
In 1902…apparent post-frontal northwest winds were sustained to 45 mph with gusts to 53 mph. A trace of snow fell.
In 1905…only a trace of snow fell in downtown Denver. This was the only snow and precipitation for the month… Ranking the month the second driest and the second least snowiest December on record.
In 1921…snowfall was 5.5 inches in downtown Denver. Northwest winds were sustained to 24 mph with an extreme velocity of 25 mph.
In 1951…a vigorous pacific cold front produced a northwest wind gust to 51 mph at Stapleton Airport where brief blowing dust was observed.
In 1957…a strong pacific cold front produced northwest wind gusts to 54 mph at Stapleton Airport where the surface visibility was briefly reduced to 1 1/2 miles in blowing dust.
In 1977…high winds in Boulder lifted a warehouse from its foundation and ripped it apart. Wind gusts from 60 to 103 mph toppled and injured a man while walking. Winds were clocked to 104 mph at Nederland…100 mph at Morrison…and 62 mph at Rocky Flats. Northwest winds gusted to 41 mph at Stapleton International Airport.
In 1996…for the second day in a row high winds ripped the Front Range foothills. Winds gusted to 81 mph in Golden Gate Canyon. West-northwest winds gusted to 37 mph at Denver International Airport.
In 2013…high winds developed ahead of an approaching storm system. The strong winds downed several trees around Evergreen. Peak wind gusts included: 79 mph…4 miles west-southwest of Eldorado Springs; 78 mph…3 miles south of Evergreen; 75 mph and the NCAR Mesa Lab; and 69 mph in Longmont.
November brought Thornton cooler than normal temperatures and a bit more snow than usual. What will December hold for us?
The month of December brings with it the official start of winter and oftentimes, colder and snowier weather conditions.
It however can also offer unseasonably warm temperatures and bone dry conditions. Given our recent mild and dry weather, we are certainly hoping for a change in the coming month.
Overall December’s monthly mean temperature of 30.0 degrees (1981 – 2010 averages) makes it our coldest month. Snow is always on everyone’s mind this time of year but December is only our 3rd snowiest month behind March and November with an average of 8.5 inches of the white stuff.
November 25 to December 1: This week in Denver weather history
From powerful, damaging wind to snowstorms that snarled Thanksgiving holiday traffic, this week in Denver weather history has been an eventful one.
From the National Weather Service:
21-25
In 1952…snowfall of 6.2 inches was measured at Stapleton Airport where northeast winds gusted to 17 mph on the 21st.
24-25
In 1908…heavy snowfall totaled 7.0 inches over downtown Denver overnight. North winds were sustained to 15 mph.
In 1930 strong winds raked the Front Range eastern foothills. Winds gusted to 40 mph at Valmont just east of Boulder where minor damage occurred.
In 1970…strong Chinook winds warmed Boulder. At the National Center for Atmospheric Research in Boulder…wind gusts reached 97 mph…while in downtown Boulder winds peaked to 69 mph. Some minor damage occurred. Northwest winds gusted to 39 mph at Stapleton International Airport…and the high temperature warmed to 76 degrees on the 25th…setting a new record maximum for the date.
25
In 1877…northwest winds were sustained to 50 mph.
In 1902…northwest winds were sustained to 45 mph with gusts to 48 mph. The strong apparent bora winds warmed the temperature to a high of only 45 degrees.
In 1943…snowfall of 4.0 inches was the only measurable snow of the month. North winds were sustained to 17 mph.
In 1958…strong pre-frontal Chinook winds struck Boulder and the eastern foothills. A wind gust to 100 mph was recorded northwest of Denver. A gust to 88 mph occurred at Rocky Flats south of Boulder. The windstorm caused considerable structural damage to residential sections of north metro Denver.
In 1959…strong winds raked the eastern foothills including Boulder and Eldorado Springs. Wind gusts to 100 mph were estimated at the Matterhorn Restaurant located atop Rocky Flats south of Boulder.
In 1993…a wind gust to 99 mph was recorded atop Squaw Mountain near Idaho Springs.
In 1998…strong winds developed over portions of the Front Range foothills for a brief time following the passage of a weak upper level disturbance. A wind gust to 71 mph was measured atop Blue Mountain near Coal Creek Canyon.
In 1999…strong Chinook winds developed in and near the foothills. Peak wind reports included 100 mph at the Eldora Ski Resort and 77 mph at the National Center for Atmospheric Research mesa lab above Boulder. West winds gusted to 38 mph at Denver International Airport.
In 2010…high winds developed in the foothills of Boulder County. A gust to 75 mph occurred 5 miles northwest of Boulder with a gust to 72 mph at the National Center for Atmospheric Research Mesa Lab above Boulder. West winds gusted to 24 mph at Denver International Airport.
25-26
In 1887…snowfall totaled 2.9 inches in the city. This was the only measurable snow of the month. Northeast winds were sustained to 18 mph on the 26th when the temperature dipped to 12 degrees below zero.
In 1959…a sharp cold front produced a northwest wind gust to 51 mph…followed by snow and falling temperatures from a high of 60 degrees to a low of 23 degrees at midnight on the 25th. Snowfall totaled 4.4 inches at Stapleton Airport before ending early on the 26th.
In 1972…winds gusted to 104 mph at the Rocky Flats plant south of Boulder. Gusts to 70 mph were recorded at the National Bureau of Standards in Boulder…while in downtown Boulder winds peaked to 68 mph. Some damage was reported. Northwest winds gusted to 47 mph at Stapleton International Airport on the 26th.
In 1984…blowing snow closed I-70 east of Denver…stranding over a thousand travelers in Limon. Denver received only 2.3 inches of snowfall. North winds gusted to 31 mph at Stapleton International Airport.
In 1999…strong Chinook winds redeveloped overnight in and near the foothills. Peak wind gusts included 72 mph atop Blue Mountain near Wondervu and at the National Center for Atmospheric Research mesa lab above Boulder.
25-27
In 1978…heavy snowfall of 6.0 inches was measured at Stapleton International Airport where north winds gusted to 20 mph. Most of the snow…4.8 inches…fell on the 25th. The greatest amount of snow measured on the ground was 5 inches due to settling and melting.
25-28
In 1952…the average coldest 4-day period in November in the previous 81 years of record occurred. Maximum temperatures of 19…15…21…and 25 degrees were recorded. Minimum temperatures were below zero each day with readings of 7 below…6 below…5 below…and 6 below.
25-29
In 1985…dense fog with visibilities as low as 1/8 mile occurred on five consecutive days at Stapleton International Airport. The fog was at times accompanied by light snow… Light freezing drizzle…or ice crystals. Fog occurred all day on both the 26th and 29th.
26
In 1873…west winds increased to a violent gale at 3:00 am and reached a maximum sustained velocity of 56 mph at 3:15 am. The winds continued with a velocity of not less than 40 mph until 6:00 am. Winds continued brisk for the remainder of the day. The strong winds caused damage to houses and buildings in the city. Temperatures were in the 50’s through early afternoon with a recorded high of 59 degrees. Winds also blew strongly in Boulder and caused 300 dollars in damage.
In 1911…post-frontal northeast winds were sustained to 43 mph with gusts as high as 52 mph. Snowfall was only 0.5 inch.
In 1965…post-frontal snowfall totaled 5.5 inches at Stapleton International Airport where strong west winds gusted to 39 mph during the afternoon.
In 1976…2 to 4 inches of snow with an arctic cold front produced near zero visibility at times in blowing snow… Causing multiple automobile accidents in metro Denver. Snowfall totaled 3.5 inches at Stapleton International Airport where north winds gusted to 39 mph. Temperatures hovered in the teens and lower 20’s most of the day dipping to 7 degrees by midnight.
In 1977 a strong wind storm raked metro Denver. High winds blew windows from office towers in Denver and Boulder. Thirteen people were injured in Boulder due to flying debris. Wind gusts to 119 mph were clocked on Davidson Mesa southeast of Boulder…with 109 mph in downtown Boulder. Six airplanes were damaged at Jefferson County Airport near Broomfield. Winds to 90 mph were reported in Lakewood. Glass was blown out of several vehicles in Wheat Ridge…and roofs were blown off 4 houses in Arvada. Several houses under construction collapsed across metro Denver. Winds to 75 mph were reported at the Denver Federal Center with 90 mph at Rocky Flats. West winds gusted to 51 mph at Stapleton International Airport. Total insured damage from the wind storm was 2.2 million dollars.
In 1987…a Thanksgiving snowstorm brought 5 inches of snow to metro Denver and 6 inches to the foothills. At Stapleton International Airport…snowfall totaled 5.0 inches…north winds gusted to 22 mph…and temperatures hovered in the upper 20’s most of the day.
In 1991…strong winds were recorded in and near the eastern foothills. Winds at Rollinsville were clocked to 70 mph with 45 mph recorded in Boulder and 51 mph at the U.S. Atomic Energy Commission Rocky Flats plant. West winds gusted to only 28 mph at Stapleton International Airport.
With the last part of December fresh in our minds, it would not be surprising to think of the month as a cold one. However, reaching back, if you recall, we actually enjoyed a lot of mild days earlier and very little precipitation. As a result, December 2017 goes into the books as a warm and dry one.
The first half of the month was notable for stable conditions yielding above normal temperatures and no precipitation. Denver set a record high temperature on the 12th of 69 degrees which was also our warmest reading of the month.
Not long after the warmth came the cold. Arctic air infiltrated from the north on the 21st resulting in much cooler temperatures and a pre-Christmas snow. This was followed by another snow on the 23rd that lasted into the early morning hours of Christmas Eve. Single digit lows were seen for seven days from the 21st to the 27th.
We then saw a brief warmup for the 27th to the 29th but that was short lived. We closed out the month with the final two days’ high temperatures failing to reach even the freezing mark.
On average, Denver’s temperature for December comes in at 30.0 degrees. Both Thornton and the Mile High City came in above that with average readings of 31.8 degrees and 33.2 degrees respectively.
Thornton saw its warmest temperature reading of 69.1 degrees on the 12th and its coldest of 1.6 degrees on the morning of the 27th. Denver’s warmest reading of 69 degrees also came on the 12th and its coldest of -4 degrees came on the 24th.
In terms of precipitation, Thornton saw a mere 0.16 inch of liquid in its bucket for the month. Denver was a bit better with 0.21 inches. Both were below the long-term Denver average of 0.35 inches.
December on average brings 8.5 inches of snowfall to Denver. Thornton fell well short of that with 4.7 inches and Denver just a bit less with 4.0 inches.
Thornton, Colorado’s December 2017 temperature summary. (ThorntonWeather.com)Thornton, Colorado’s December 2017 precipitation summary. (ThorntonWeather.com)
CLIMATE REPORT
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
645 AM MST MON JAN 1 2018
...................................
...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2017...
CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2017
WEATHER OBSERVED NORMAL DEPART LAST YEAR`S
VALUE DATE(S) VALUE FROM VALUE DATE(S)
NORMAL
................................................................
TEMPERATURE (F)
RECORD
HIGH 79 12/05/1939
LOW -25 12/22/1990
12/24/1876
HIGHEST 69 12/12 62 7 65 12/30
LOWEST -4 12/24 -4 0 -15 12/17
AVG. MAXIMUM 48.3 42.8 5.5 42.7
AVG. MINIMUM 18.0 17.1 0.9 12.9
MEAN 33.2 30.0 3.2 27.8
DAYS MAX >= 90 0 0.0 0.0 0
DAYS MAX <= 32 4 5.8 -1.8 6
DAYS MIN <= 32 28 29.4 -1.4 30
DAYS MIN <= 0 1 2.0 -1.0 4
PRECIPITATION (INCHES)
RECORD
MAXIMUM 5.21 1913
MINIMUM 0.00 1881
TOTALS 0.21 0.35 -0.14 0.78
DAILY AVG. 0.01 0.01 0.00 0.03
DAYS >= .01 4 4.1 -0.1 6
DAYS >= .10 1 1.1 -0.1 2
DAYS >= .50 0 0.1 -0.1 0
DAYS >= 1.00 0 0.0 0.0 0
GREATEST
24 HR. TOTAL 0.10 12/23 TO 12/23
STORM TOTAL 0.10 12/23 TO 12/23
SNOWFALL (INCHES)
RECORDS
TOTAL 57.4 1913
TOTALS 4.0 2017 8.5
DEGREE_DAYS
HEATING TOTAL 979 1086 -107 1146
SINCE 7/1 2150 2468 -318 2042
COOLING TOTAL 0 0 0 0
SINCE 1/1 881 769 112 878
FREEZE DATES
RECORD
EARLIEST 09/08/1962
LATEST 06/08/2007
EARLIEST 10/07
LATEST 05/05
.................................................................
WIND (MPH)
AVERAGE WIND SPEED 10.0
RESULTANT WIND SPEED/DIRECTION 2/214
HIGHEST WIND SPEED/DIRECTION 37/270 DATE 12/04
HIGHEST GUST SPEED/DIRECTION 48/280 DATE 12/04
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.50
NUMBER OF DAYS FAIR 8
NUMBER OF DAYS PC 18
NUMBER OF DAYS CLOUDY 5
AVERAGE RH (PERCENT) 49
WEATHER CONDITIONS. NUMBER OF DAYS WITH
FOG OR MIST 12
FOG VSBY LESS 1/4 MI 4
THUNDER 0
ICE PELLETS 0
HAIL 0
FREEZING RAIN DRIZZLE 0
DUST STORM 0
SMOKE OR HAZE 5
BLOWING SNOW 0
TORNADO 0
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
December 31 to January 6: This week in Denver weather history
One of our coldest and driest months, January is not normally known for its weather extremes. However just like any in Colorado, significant events can occur as we see in our look back at this week in Denver weather history.
From the National Weather Service:
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.
30-31
In 1886…heavy snow totaled 6.5 inches in downtown Denver. Most of the snow…4.5 inches…fell on the 31st. North winds were sustained to 18 mph.
In 1928…snowfall of 0.6 inch was the only measurable snow of the month in the city.
In 1947…post-frontal heavy snow totaled 6.3 inches over downtown Denver. Most of the snow fell on the 30th. North winds were sustained to 17 mph on the 30th.
In 1995…the foothills west of Denver received 5 to 9 inches of new snow…except for Bailey where 11 inches of snow were measured. No snow fell at the site of the former Stapleton International Airport.
31
In 1890…northeast winds were sustained to 46 mph with gusts as high as 60 mph behind an apparent cold front. A trace of sleet fell.
In 1899…northwest winds were sustained to 44 mph with gusts as high as 48 mph. The Chinook winds warmed the temperature to a high of 49 degrees.
In 1927…the temperature was below zero all day. The high temperature of 3 degrees below zero was a record low maximum for the date. The low temperature was 11 degrees below zero.
In 1970…warm Chinook winds whistled through Boulder. A wind gust to 92 mph was recorded at the National Center for Atmospheric Research…while at the National Bureau of Standards…winds peaked to 70 mph. Northwest winds gusting to 30 mph warmed the temperature to a high of 60 degrees at Stapleton International Airport.
In 1993…occasional high winds occurred northwest of Denver and in the foothills. A wind gust to 85 mph was recorded at Jefferson County Airport in Broomfield. Wind gusts to 86 mph occurred on Squaw Mountain with 75 mph recorded at Rollinsville. West winds gusted to 46 mph at Stapleton International Airport.
In 2011…an intense and fast moving storm system… produced a powerful windstorm across the Front Range. In the mountains and foothills…several locations recorded wind gusts in excess of 100 mph. Numerous trees were knocked down throughout Arapahoe National Forest. One man was killed when he was impaled by a falling tree limb while driving along U.S. Highway 36…north of Boulder. The strong winds produced extensive damage to fences and roofs… and also knocked down trees which resulted in power outages that affected 19 thousand residents along the Front Range. In the mountains and foothills…peak wind gusts included: 111 mph…3 miles south-southeast of Pinecliffe; 101 mph…1 mile west of Lyons; 94 mph atop Berthoud Pass; 86 mph…3 miles south of Golden; 84 mph… 4 miles northwest of Boulder; 81 mph in Boulder; 79 mph at Kenosha Pass…NCAR Mesa Lab and the junction of U.S. Highways 72 and 93; 77 mph at the National Wind Technology Center; and 76 mph…3 miles north-northwest of Morrison. Peak wind gusts for the Urban Corridor included: 80 mph…3 mile east of Cedar Point; 77 mph in north Longmont; 67 mph…10 miles east of Parker; 64 mph at Buckley AFB and Lakewood; 60 mph at Bennett and Front Range Airport in Watkins; 59 mph at Denver International Airport and Deer Trail; 58 mph at Rocky Mountain Regional Airport in Broomfield and 2 miles north-northwest of Louisville.
31-1
In 1900…low temperatures dipped to 19 degrees below zero on both days to establish daily record minimum temperatures.
In 1975…only 4.2 inches of snow fell at Stapleton International Airport…while north of Denver a major blizzard raged. All roads north of Denver into Wyoming were closed when strong winds whipped snow into 5 to 6 foot drifts. North winds gusted to 43 mph at Stapleton International Airport on the 31st…causing some blowing snow. Freezing drizzle also fell on the 31st.
In 1984…heavy snow fell in the foothills with 8 inches at Boulder and 6 inches in southern and western metro Denver. Only 1.5 inches of snow fell overnight at Stapleton International Airport.
In 1991…a New Year’s Eve snow storm dumped 2 to 8 inches of snow across northeastern Colorado. Snowfall totaled 3.4 inches at Stapleton International Airport. The 1.9 inches of snow that fell on the 31st was the only measurable snowfall of the month.
In 2008…another brief period of high winds occurred in and near the foothills of Boulder and Jefferson counties. In Nederland…the strong wind snapped a blue spruce which landed on a nearby propane tank. Some roofs in the immediate area were damaged and power lines were downed; which left 126 residences without electricity for six hours. Peak wind gusts included 90 mph at the national wind technology center…and 89 mph; 6 miles northwest of Boulder. At Denver International Airport…a peak wind gust of 23 mph was measured from the southwest.
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
In 1875…the temperature fell 27 degrees between 3:00 pm and 5:00 pm. The high for the day was 43 degrees…and the low was 8 degrees. Occasional snow flurries fell during the day…but not enough to cover the ground.
In 1885…dense smoke choked the skies over downtown Denver until midday.
In 1910…a rare trace of light rain fell during the morning.
In 1911…post-frontal northeast winds were sustained to 40 mph. Only a trace of snow fell in downtown Denver.
In 1952…snowfall of 0.03 inch was the only measurable snowfall of the month and resulted in 0.01 inch of melted snow…the only precipitation of the month.
In 1956…west-northwest winds gusted to 52 mph at Stapleton Airport.
In 1996…the first snow storm of the new year dumped more than a foot of snow in the Front Range foothills with 4 to 9 inches across the western and southern sections of metro Denver. Snow totals included: 14 inches at conifer; 11 inches at Evergreen; and 10 inches at Eldora Ski Resort… West of Boulder. Snowfall totaled only 1.2 inches at the site of the former Stapleton International Airport. North- northeast winds gusted to 30 mph at Denver International Airport.
In 2003…only a trace of snow fell at the site of the former Stapleton International Airport. This…along with a trace of snow on the 22nd…was the only snow of the month…which equaled the 1934 record for the least snowiest January.
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.
Fire in the sky at sunrise on December 3, 2017. (Ed Dalton)
The month of December can offer everything from bone dry conditions to bone chilling cold and monstrous snowstorms. The weather and wildlife all afford an abundance of photo opportunities as our December photo slideshow shows.
Leaves have fallen from trees now and the landscape can sometimes look quite stark. However it only takes a quick shot of snow to change that picture greatly. Throw in gorgeous sunrises and sunsets, plenty of wildlife big and small, kids playing and much more and the month can be quite colorful and eventful.
Slideshow updated December 30, 2017
To learn more about how to send your photo to us for inclusion in the slideshow, see below the slideshow.
Showcasing images captured by ThorntonWeather.com readers as well as some of our own, our monthly slideshow covers the entire gamut of weather-related imagery.
Sunsets, sunrises, wildlife and of course every type of weather condition are vividly depicted in images captured from yours and our cameras.
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What is missing in the slideshow above? Your photo!
Our monthly photo slideshow is going to feature images that we have taken but more importantly images that you have captured. The photos can be of anything even remotely weather-related.
Landscapes, current conditions, wildlife, pets, kids. Whimsical, newsy, artsy. Taken at the zoo, some other area attraction, a local park, a national park or your backyard. You name it, we want to see and share it!
Images can be taken in Thornton, Denver or anywhere across the extraordinary Centennial State. We’ll even take some from out of state if we can tie it to Colorado somehow.
We’ll keep the criteria very open to interpretation with just about any image eligible to be shown in our slideshows.
What do you win for having your image in our slideshow? We are just a ‘mom and pop’ outfit and make no money from our site so we really don’t have the means to provide prizes. However you will have our undying gratitude and the satisfaction that your images are shared on the most popular website in Thornton.
To share you images with us and get them included in the slideshow just email them to us or share them with ThorntonWeather.com on any of the various social media outlets. Links are provided below.
December 24 to December 30: This week in Denver weather history
Christmas Day is normally a relatively quiet day in terms of the weather but the week between it and New Year’s can be quite eventful. Among the highlights are a prolonged period of sub-zero temperatures that lasted nearly five days. Just 11 years ago a blizzard struck the region that snarled holiday travel on the air and the ground.
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.
18-24
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.
20-25
In 1983…an extremely bitter cold spell occurred. The temperature remained below zero for 115 hours in Denver… The longest sub-zero period on record. The mercury dipped to 21 degrees below zero on the 21st…the coldest recorded temperature in over 20 years. The cold was accompanied by winds that plunged chill factors to 50 to 70 degrees below zero. Two people froze to death in Denver; both were found outside dead of exposure. Numerous cases of frostbite were reported. Hundreds of water pipes broke from the intense cold…water mains and natural gas lines also fractured…and electricity consumption reached record levels. Light snow totaling 5.8 inches fell at times…and holiday traffic was delayed at Stapleton International Airport for several hours. Eight daily temperature records were set at the time. The all-time record low maximum temperature for the month of 8 degrees below zero on the 21st still stands today. Other temperature records still standing include record low maximum temperatures of 5 degrees below zero on both the 22nd and 23rd and 4 degrees below zero on the 24th.
22-24
In 2009…A winter storm produced moderate to heavy snow across parts of the Front Range and adjacent plains. In the foothills…storm totals included: 11.5 inches near Eldorado Springs…10 inches…3 miles southeast of Pinecliffe; 9 inches at Genesee…2 miles southwest of Golden and Ken Caryl; 8 inches…3 miles west of Jamestown and White Ranch Open Space; 7 inches…4 miles east-northeast of Nederland. Across the Urban Corridor and adjacent plains…storm totals included: 9 inches…2 miles west of Parker; 8 inches at Watkins; 7 inches…2 miles west-southwest of Byers…12 miles southwest of Buckley AFB and 3 miles northeast of Parker. At Denver International Airport…6.1 inches of snowfall was observed.
23-24
In 1907…winds nearly as strong as a hurricane raked Boulder and areas north of Denver…killing one person and injuring others. Property damage was minor.
In 1973…a pre-Christmas blizzard…the second in 5 days… Produced strong winds and dumped heavy snow across metro Denver. Nearly a foot…11.8 inches…of snow fell at Stapleton International Airport where north winds gusting from 30 to 40 mph produced much blowing snow. The strong winds whipped the snow into 2- to 4-foot drifts…closing many roads and airports. About 10 thousand people were stranded at Stapleton International Airport for up to 24 hours.
In 1978…wind gusts to 90 mph on the 23rd and 73 mph on the 24th were recorded in Boulder. A townhouse under construction was severely damaged by the winds. At Stapleton International Airport…west winds gusted to 37 mph on the 23rd and northwest winds gusted to 35 mph on the 24th.
In 1987…a snowstorm assured a white Christmas for metro Denver…where 4 to 8 inches fell. Amounts in the foothills ranged from 10 to 18 inches. Snowfall totaled 3.9 inches at Stapleton International Airport…where north winds gusted to 32 mph on the 23rd.
20-25
In 1983…an extremely bitter cold spell occurred. The temperature remained below zero for 115 hours in Denver… The longest sub-zero period on record. The mercury dipped to 21 degrees below zero on the 21st…the coldest recorded temperature in over 20 years. The cold was accompanied by winds that plunged chill factors to 50 to 70 degrees below zero. Two people froze to death in Denver; both were found outside dead of exposure. Numerous cases of frostbite were reported. Hundreds of water pipes broke from the intense cold…water mains and natural gas lines also fractured…and electricity consumption reached record levels. Light snow totaling 5.8 inches fell at times…and holiday traffic was delayed at Stapleton International Airport for several hours. Eight daily temperature records were set at the time. The all-time record low maximum temperature for the month of 8 degrees below zero on the 21st still stands today. Other temperature records still standing include record low maximum temperatures of 5 degrees below zero on both the 22nd and 23rd and 4 degrees below zero on the 24th.
24
In 1876…the all-time lowest recorded temperature in December… 25 degrees below zero…occurred. The same temperature was also reached on December 22…1990.
In 1907…west winds were sustained to 43 mph. The Chinook winds warmed the temperature to a high of 58 degrees.
In 1908…west Bora winds sustained to 49 mph produced a high temperature of 42 degrees. A trace of snow fell.
In 1977…wind damaged temporary wooden structures at construction sites in Denver. Several trees were blown over…causing damage to houses and cars. Power outages occurred in northwest Denver. Some chimneys were blown off a house in the Ken Caryl Ranch area. Wind gusts to 70 mph were reported in Boulder…and northwest winds gusted to 53 mph at Stapleton International Airport.
In 1982…on Christmas eve… one of the worst blizzards of all time dumped 24 to 34 inches of snow across metro Denver. The heaviest official one-day snow amount in the city’s history…23.6 inches…brought traffic to a standstill and completely closed Stapleton International Airport on Christmas day. Boulder received 18 to 24 inches of snow. Two feet of snow buried Parker and Sedalia to the south of Denver. Weather conditions during the storm were brutal. Visibility at Stapleton International Airport was reduced to 1/4 mile or less for 17 consecutive hours. Sustained winds of 25 mph or more persisted for 15 consecutive hours. Gusts over 40 mph were recorded during 12 different hours. The highest recorded wind gust was 51 mph. The howling winds blew snow into drifts 4 to 8 feet high…paralyzing all modes of transportation. All highways leading out of Denver were closed. Stapleton International Airport was closed for 33 hours and operated on only a limited schedule for days afterward. Thousands of travelers were stranded and failed to reach their destinations in time for Christmas. Many wayward commuters and shoppers were forced to take refuge in shopping malls… Which remained open when workers themselves became stranded. Mall restaurants served food to the refugees. The storm prevented most people in the area from spending Christmas day with family and friends. In metro Denver…three people died as a direct result of the blizzard: a 60-year-old man died of hypothermia on his screened in back porch; a 66 year old man froze to death after falling into a drift a few feet from his home; a 34- year-old man froze to death just east of Denver after abandoning his 4-wheel drive vehicle which became stuck in the snow. With the heavy snow and wind chill temperatures of 20 to 30 degrees below zero…there were many injuries from frostbite and falls. Damage from the blizzard was varied and widespread. A number of roofs collapsed under the weight of the heavy snow; greenhouses received the greatest damage when the heavy snow shattered glass roofs… Allowing cold air to freeze the tender plants inside. Total damage to greenhouses and plants alone was estimated at 5 million dollars. The strong winds with the storm damaged many fences and caused numerous power outages. Last minute Christmas shoppers were literally left out in the cold and snow…as the storm made travel increasingly difficult during the day. Merchants lost significant income from the last shopping day before Christmas. Overall…businesses lost an estimated 500 million dollars due to the blizzard. In metro Denver…seven million dollars were spent for snow removal…three million dollars in the city of Denver alone. This expenditure did not prevent a subsequent snow removal controversy. Once the major streets were made passable…cold late December and January temperatures prevented much melting. Icy and snowpacked side streets and parking lots became rutted… Making travel around metro Denver difficult for nearly a month after the storm. In fact…snow cover of an inch or more lasted for 48 consecutive days after the storm… Through February 9…1983. This is the third longest period of snow cover on record in the city. The period would have been longer…but no significant snow fell for more than 2 months after the storm.
24-25
In 1891…heavy snowfall of 7.0 inches in downtown Denver provided a white Christmas. Most of the snow…6.5 inches… Fell on the 24th. Northwest winds were sustained to 30 mph with gusts to 40 mph on the 24th.
In 1894…snow began falling during the evening of the 24th… Ended during the early afternoon of the 25th…and totaled 6.4 inches in downtown Denver. Northwest winds were sustained to 26 mph with gusts to 30 mph on the 24th. The maximum snow depth on the ground was 5 inches. The high temperature was only 18 degrees on the 25th after a low of 8 degrees.
In 1980…strong Chinook winds of 50 to 60 mph occurred in the foothills with a wind gust to 90 mph recorded at Wondervu. West winds gusted to 33 mph at Stapleton International Airport on the 25th.
In 1997…a relatively rare Christmas snowstorm blanketed much of northeastern Colorado. Snowfall in and near the Front Range foothills and south of metro Denver ranged from 5 to 8 inches. Elsewhere…new snow accumulations were generally 1 to 3 inches. Snowfall totaled only 1.5 inches at the site of the former Stapleton International Airport. North winds gusted to 29 mph at Denver International Airport on the 24th.
In 2012…a winter-like weather moved into northeast Colorado on Christmas Eve as an upper level trough and a strong cold front moved through the region. At Denver International Airport…2.5 inches of snow fell from Christmas Eve through Christmas morning. The high temperatures on Christmas Day only reached 16 degrees…which was the coldest day of the month.
25
In 1873…northwest winds were sustained to 36 mph during the morning and to 48 mph in the evening. The Chinook winds warmed the temperature to a high of 53 degrees.
In 1883…gusty very strong winds raked Boulder…causing 11 hundred dollars in damage.
In 1985…Table Mesa in Boulder was buffeted by wind gusts to 68 mph.
In 1993…occasional high winds occurred over portions of the higher foothills west of Boulder and Denver. A wind gust to 87 mph was recorded on squaw mountain…and a gust to 83 mph occurred at Rollinsville. Northwest winds gusted to 35 mph at Stapleton International Airport.
In 2007…a winter storm brought heavy snow to the Front Range of Colorado. The heaviest snow fell near the foothills of Boulder…Douglas and Jefferson counties. The snow caused accidents throughout the Denver metropolitan area. Gusty winds produced snow drifts from 2 to 3.5 feet in depth. Total snowfall for the calendar day in Denver was 7.8 inches…setting a new record for Christmas Day. The measurement was taken at the former Stapleton International Airport; the previous record was 6.2 inches… Set in 1894. Storm totals in the Front Range foothills included: 13.5 inches at Coal Creek Canyon; 12 inches…5 miles east-southeast of Aspen Park; 11 inches; 6 miles southwest of kassler; 10.5 inches at Eldorado Springs. Elsewhere…storm totals ranged from 5 to 10 inches. In the urban corridor storm totals included: 9 inches near Elizabeth; 8 inches in southwest Denver…Highlands Ranch…Marston Reservoir and Wheat Ridge; 7.5 inches in Arvada; 7 inches in Centennial and Lakewood; 6.5 inches in Aurora and 8 miles southeast of Watkins; 6 inches in Boulder…Englewood and Parker. Elsewhere…storm totals ranged from 3 to 5 inches.
25-26
In 1904…after a warm Christmas Fay 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.
We were expecting snow but not quite as much as received. The storm that hit yesterday evening delivered a respectable 3.5 inches to Thornton as snow bands were quite strong and aided by upslope. Temperatures early this morning dipped well into the single digits, our coldest readings since January 7.
The time lapse video below captures four hours of the event as it started and then began to taper off.
December 17 to December 23: This Week in Denver Weather History
Looking back at Denver weather history, it is readily apparent that the week leading up to Christmas has historically been a very eventful one. There are certainly many of the snow and wind events we would expect to see. Most notable however are the major winter storms like the pre-Christmas storm of 2006.
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.
16-17
In 1908…heavy snowfall totaled 7.9 inches in downtown Denver where north winds were sustained to 20 mph on the 17th. Temperatures were in the teens and 20’s.
In 1939…low temperatures of 49 degrees on the 16th and 43 degrees on the 17th were record high minimums for the dates. High temperatures of 65 on the 16th and 72 on the 17th were not records.
In 1980…Chinook winds blew through the night in Boulder with a peak reported gust to 75 mph. Northwest winds gusted to 30 mph at Stapleton International Airport on the 17th. The strong Chinook winds warmed temperatures to record daily highs of 70 degrees on the 16th and 73 degrees on the 17th.
17
In 2000…high winds gusting from 60 to 74 mph howled across the northeast plains of Colorado. In Parker where winds gusted to 60 mph…a 20-foot by 40-foot piece of roof was ripped from a building. West winds gusted to 53 mph at Denver International Airport. This was the highest wind gust of the month at the airport. An intense…but very localized wind gust to 112 mph was measured near Georgetown Lake in the foothills west of Denver.
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
In 1901…north winds were sustained to 52 mph with gusts to 58 mph behind an apparent cold front.
In 1973…a brief blizzard dumped heavy snow across metro Denver. Snowfall totaled 9.2 inches at Stapleton International Airport where north winds gusting to 53 mph produced much blowing snow. The storm forced many schools and businesses to close.
In 1996…a homeless man in Denver was found unconscious in his car suffering from exposure. The man’s body temperature was only 85 degrees when he was discovered. He died several hours later. Early morning temperatures had dipped to 9 degrees below zero.
In 1999…high winds were reported for a brief time in the foothills. Winds gusted to 72 mph in Golden Gate Canyon and to 71 mph at the National Center for Atmospheric Research in the foothills southwest of Boulder. West winds gusted to only 39 mph at Denver International Airport where the temperature warmed to a high of 53 degrees.
In 2002…only a trace of snow fell at the site of the former Stapleton International Airport. This…along with the trace of snow on the 5th…was the only snow of the month…ranking the month the 2nd least snowiest on record.
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 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
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.
20-25
In 1983…an extremely bitter cold spell occurred. The temperature remained below zero for 115 hours in Denver… The longest sub-zero period on record. The mercury dipped to 21 degrees below zero on the 21st…the coldest recorded temperature in over 20 years. The cold was accompanied by winds that plunged chill factors to 50 to 70 degrees below zero. Two people froze to death in Denver; both were found outside dead of exposure. Numerous cases of frostbite were reported. Hundreds of water pipes broke from the intense cold…water mains and natural gas lines also fractured…and electricity consumption reached record levels. Light snow totaling 5.8 inches fell at times…and holiday traffic was delayed at Stapleton International Airport for several hours. Eight daily temperature records were set at the time. The all-time record low maximum temperature for the month of 8 degrees below zero on the 21st still stands today. Other temperature records still standing include record low maximum temperatures of 5 degrees below zero on both the 22nd and 23rd and 4 degrees below zero on the 24th.
21
In 1884…light snow fell from an apparent cloudless sky between 4:15 am and 5:00 am. Snowfall totaled 3.5 inches for the day.
In 1900…west winds sustained to 46 mph with gusts to 54 mph warmed the temperature to a high of 59 degrees.
In 1910…heavy snowfall totaled 8.0 inches in downtown Denver. Northwest winds were sustained to 25 mph.
In 1961…strong winds associated with a cold front whipped snow across metro Denver. West wind gusts to 62 mph were recorded at Stapleton Airport. There was considerable damage to power lines…signs…and Christmas decorations. In Denver…4 people were injured by wind-caused accidents. Two small planes were flipped over at Stapleton Airport while attempting to land. Only a trace of snow fell at Stapleton Airport.
In 1983…the high temperature climbed to only 8 degrees below zero at Stapleton International Airport. This set the record for the lowest maximum temperature of the month.
In 1987…strong winds howled in the foothills and in Boulder. Wind gusts reached 78 mph in east Boulder…85 mph at Table Mesa in southwest Boulder…93 mph near Rollinsville…and 97 mph at the National Center for Atmospheric Research in Boulder. West winds gusted to 37 mph at Stapleton International Airport.
21-22
In 1969…strong winds raked the eastern foothills in Boulder and Jefferson counties. Wind gusts to 115 mph were recorded at the National Center for Atmospheric Research in Boulder…while in downtown Boulder winds gusted to 75 mph. Some damage occurred.
In 1981…a snow storm dumped 3 to 8 inches of snow across eastern Colorado. Snowfall totaled 6.8 inches at Stapleton International Airport where north winds gusted to only 17 mph.
In 2011…large scale lift from an upper level low combined with a deep easterly upslope flow behind a cold front to produce heavy snow in and near the Front Range Foothills and Palmer Divide. Storm totals ranged from 1.5 to 3 feet in the Front Range Foothills…with 1 to 1.5 feet along the Urban Corridor. In the Front Range Foothills and Palmer Divide…storm totals included: 36.5 inches… 7 miles southwest of Boulder; 32 inches…12 miles northwest of Golden; 28 inches at Genesee; 24.5 inches…3 miles west of Jamestown; 23 inches at Bergen Park; 21 inches at Evergreen and Gross Reservoir; 19 inches near Eldorado Springs and 3 miles west-southwest of Conifer; 17 inches…4 miles south-southwest of Tiny Town; and 13.5 inches…15 miles north of Elizabeth. Along the Urban Corridor…storm totals included: 18 inches in Golden; 14.5 inches in Boulder…13 inches at the National Weather Service in Boulder; 12.5 inches…5 miles south-southwest of Arapahoe Park; 12 inches at Lone Tree; 11.5 inches in Broomfield; 11 inches in Arvada…4 miles northwest of Elbert…Niwot and Wheatridge; 10 inches in northwest Denver; with 7.3 inches at Denver International Airport.
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In 1924…heavy snowfall totaled 7.9 inches over downtown Denver. During the storm north to northeast winds were sustained to 21 mph. Temperatures were quite cold…ranging from a high of 24 degrees on the 21st to a low of 5 degrees below zero on the 23rd.
In 1964…high winds were recorded along the eastern foothills. A wind gust to 100 mph was registered at Jefferson County Airport near Broomfield. In Boulder… Where many thousands of dollars in damage occurred…warm Chinook winds gusted in excess of 45 mph downtown. A wind gust to 82 mph was recorded at the National Center for Atmospheric Research in Boulder. Heavy damage to power lines…homes…and roads was reported at Evergreen…Golden… And Boulder. Several people were injured by wind-caused accidents. West winds gusted to 53 mph on the 22nd and to 51 mph on the 23rd at Stapleton International Airport where some blowing dust occurred. The Chinook winds warmed temperatures in Denver to highs of 68 degrees on the 22nd and 71 degrees on the 23rd.
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In 1885…a windstorm produced sustained west winds to 48 mph. The winds were strong all afternoon and evening.
In 1892…terribly strong winds hit the foothills above Boulder. The wind was described as a young tornado…but likely was straight line in nature. Winds in Boulder remained calm.
In 1901…the passage of an apparent cold front produced north winds sustained to 48 mph with gusts as high as 60 mph.
In 1922…a major storm dumped 8.0 inches of snow in downtown Denver.
In 1941…post-frontal heavy snow fell over downtown Denver where 8.0 inches of new snow were measured. Northwest winds were sustained to 26 mph. The cold front and snowfall abruptly broke a week of warm weather with high temperatures in the 50’s and 60’s.
In 1977…high winds unroofed a mobile home in Broomfield. Wind gusts reached 93 mph at Table Mesa in south Boulder and 74 mph at Rocky Flats. West winds gusted to 52 mph at Stapleton International Airport.
In 1988…high winds hit many foothills areas. Recorded wind gusts reached 95 mph just north of Boulder and 80 mph on Table Mesa. The strong winds caused power outages around Boulder. West winds gusted to 45 mph at Stapleton International Airport.
In 1990…the all-time lowest recorded temperature in December… 25 degrees below zero…occurred. The same temperature was also reached on December 24…1876.
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In 1926…snow was heavy and totaled 6.7 inches in downtown Denver. Northeast winds were sustained to 17 mph with gusts to 18 mph on the 23rd.
In 1979…heavy snow blanketed metro Denver. Total snowfall at Stapleton International Airport was 6.9 inches…and north winds gusted to 20 mph. Most of the snow…5.7 inches…fell on the 22nd.
In 1984…strong Chinook winds howled along the Front Range foothills. At Table Mesa in southwest Boulder…gusts reached 108 mph on the morning of the 23rd. Gusts to 79 mph were clocked in Golden Gate Canyon. Gusts to 94 mph were reported in east Boulder. The winds flattened a two floor cinder block building under construction in Boulder… Causing 75 thousand dollars damage. Flying debris from the building slightly injured a policeman. A chain link fence was blown down. Dozens of windows and roofs were damaged in Boulder…along with mobile homes and cars. Numerous trees and power lines were downed. A giant plastic bubble dome was blown apart and collapsed…causing at least 100 thousand dollars damage. West winds gusted to 41 mph at Stapleton International Airport on the 23rd.
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In 1915…apparent Bora winds were sustained to 46 mph with gusts to 58 mph. Snowfall was only 0.8 inch in the city.
In 1955…west-northwest winds gusted to 55 mph at Stapleton Airport. The downslope winds kept the low temperature from dipping below 50 degrees…the record highest minimum for the month.
In 1969…a strong wind gust did 4 thousand dollars in damage just west of Broomfield. Minor injuries also occurred.
In 1977…high winds occurred in Boulder with 90 mph recorded at several locations. A wind gust to 72 mph was reported at Lafayette. West winds gusted to 39 mph at Stapleton International Airport.
In 1989…high winds were reported in the foothills west of Denver. At Rollinsville…a wind gust to 90 mph was measured. Northwest winds gusted to 44 mph at Stapleton International Airport.
In 2007…high winds developed in and near the Front Range foothills of Boulder and Jefferson counties. Peak gusts included: 89 mph at the national wind technology center; 88 mph atop Niwot Ridge; 83 mph…4 miles east- northeast of Bergen Park; 80 mph…3 miles southeast of Jamestown. At Denver International Airport…east of the surface trough…southeast winds gusted to 28 mph.
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In 1907…winds nearly as strong as a hurricane raked Boulder and areas north of Denver…killing one person and injuring others. Property damage was minor.
In 1973…a pre-Christmas blizzard…the second in 5 days… Produced strong winds and dumped heavy snow across metro Denver. Nearly a foot…11.8 inches…of snow fell at Stapleton International Airport where north winds gusting from 30 to 40 mph produced much blowing snow. The strong winds whipped the snow into 2- to 4-foot drifts…closing many roads and airports. About 10 thousand people were stranded at Stapleton International Airport for up to 24 hours.
In 1978…wind gusts to 90 mph on the 23rd and 73 mph on the 24th were recorded in Boulder. A townhouse under construction was severely damaged by the winds. At Stapleton International Airport…west winds gusted to 37 mph on the 23rd and northwest winds gusted to 35 mph on the 24th.
In 1987…a snowstorm assured a white Christmas for metro Denver…where 4 to 8 inches fell. Amounts in the foothills ranged from 10 to 18 inches. Snowfall totaled 3.9 inches at Stapleton International Airport…where north winds gusted to 32 mph on the 23rd.
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November brought Thornton cooler than normal temperatures and a bit more snow than usual. What will December hold for us?
