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

2-17

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.

4-6

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

5-6

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

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

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

5-7

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

5-8

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

6

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

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

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

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

6-7

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

7

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

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

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

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

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

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

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

7-9

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

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

8

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

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

8-9

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

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

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

8-10

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

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

8-12

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

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.

10-11

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

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

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

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

11

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

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

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

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

11-12

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

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

11-13

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

In 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.