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Thornton, Colorado, USA
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President’s Day in Thornton to start off extraordinarily cold, see some warming

Monday, February 15th, 2021 5:04am MDT

Old Man Winter delivering quite a bite of cold this morning with temperatures well below zero. We will see some warming today and while not much, it will improve on the single digit highs of recent days.

Mostly clear skies are going to be the rule throughout the day with a few additional clouds in the late afternoon. Overall conditions will be calm and dry. Temperatures will be starting out well below zero then steadily, slowly climb. Look for highs in the mid-teens. A Wind Chill Advisory remains in effect until 11:00am.

Tonight, partly cloudy skies will be above and lows will drop to around 8 degrees.

Keep an eye on the current temperature with our live gauges here.

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Denver sets record low temperature for February 14

Sunday, February 14th, 2021 11:59pm MDT

Record Cold Temperatures

It’s a cold one and one that easily enters the record books.

As measured at Denver International Airport, the Mile High City saw a low temperature of -14 degrees. This easily bests the previous record low for February 14 of -10 degrees set in 1903.

Additionally, the high temperature only reached 1 degree. This is the coldest high temperature recorded for the date. The old record was 8 degrees set in 1895.

Here in Thornton we didn’t get quite as cold with a low of -9 degrees and a high of 5 degrees.

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February 14 to February 20: This week in Denver weather history

Sunday, February 14th, 2021 12:01am MDT

This Week in Denver Weather History

Many notable weather events have occurred in Denver this week in the past, some recently.  It was just last year that a windstorm knocked down trees and powerlines in Boulder.  Nine years ago, we saw an end to 61 days straight with snow cover – the second longest streak in Denver history.

From the National Weather Service:

13-14

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

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

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

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

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

14

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

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

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

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

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

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

15

In 1881…the temperature plunged to a low of 20 degrees below zero in the city.  In outer areas of the city…the temperature dipped to 26.5 degrees below zero.

In 1910…west winds were sustained to 42 mph.

In 1986…high winds battered the Front Range foothills. A wind gust to 95 mph was recorded in Boulder…but winds of 60 to 80 mph were common in and near the foothills.  In Aurora…an automobile dealership lost a large plate glass window.  Southwest wind gusts to 44 mph were recorded at Stapleton International Airport.  The strong winds warmed temperatures.  A record maximum temperature of 66 degrees and a record high minimum temperature of 37 degrees were recorded at Stapleton International Airport.

In 1988…winds to 75 mph were clocked in Boulder…while a west wind gust to only 41 mph was recorded at Stapleton International Airport.

In 1997…winds gusted to 75 mph at Golden Gate Canyon during the early morning hours.  West winds gusted to 31 mph at Denver International Airport.

In 2000…high winds spread from the foothills onto the plains. While the strongest winds were north and northeast of metro Denver…west winds gusted to 58 mph in Thornton and to 54 mph at Denver International Airport.

In 2005…light precipitation of only 0.02 inch at Denver International Airport was the only measurable precipitation of the month.  This ranked the month as the 2nd driest February of record.

15-16

In 1889…heavy snowfall totaled 6.7 inches in downtown Denver.  Most of the snow…5.5 inches…fell on the 15th when northeast winds were sustained to 18 mph.

In 1921…strong Bora winds cooled maximum temperatures from the 60’s on the previous 3 days to 54 degrees on the 15th and to 43 degrees on the 16th.  West winds were sustained to 39 mph with gusts to 54 mph on the 15th and to 46 mph with gusts to 56 mph on the 16th.

In 1953…strong…cold northwest winds were widespread from the foothills across the plains.  Near gale force winds were observed in Boulder.  A wind gust to 54 mph was recorded at Stapleton Airport where blowing dust briefly reduced the visibility to 1 1/2 miles.  Damage was minor.

In 1993…an arctic cold front pushed south over the eastern Colorado plains with upslope snow developing behind the front.  Snowfall amounts of 3 to 6 inches were common over metro Denver.  At Stapleton International Airport…snowfall totaled 4.5 inches and north winds gusted to 25 mph. Temperatures hovered only in the single digits for most of the day.  The storm produced up to a foot of snow over southeast Colorado.

In 2005…light snowfall of 0.5 inch at Denver Stapleton was the only measurable snowfall of the month…which ranked the month the 2nd least snowiest February of record.

In 2006…overnight snowfall in the mountains and eastern foothills contained a lot of red dust and dirt apparently from Arizona.  Strong southwest winds with gusts to 100 mph in the San Juan Mountains on the 15th created widespread blowing dust.  This red dust became entrained in snowfall across the area.  The reddish colored snow was reported in Ward…Nederland…Blackhawk…and Boulder.  The storm produced only 0.9 inch of snowfall in the Stapleton area of Denver with 4 to 5 inches measured in the foothills.

15-17

In 1938…a cold air mass brought a light snowfall of 6.2 inches over 3 days to downtown Denver where northeast winds were sustained to 18 mph on the 15th.

16

In 1879…a sudden burst of 3 inches of snow in less than 90 minutes stopped the street cars in downtown Denver during the late afternoon.  Melted snow resulted in 0.16 inch of precipitation.  Small soft hail also fell when the snow began.  A gentleman caught on the prairie between Denver and Morrison described the event as the most severe storm of the winter while it lasted.

In 1885…a windstorm caused severe damage in the city.  The strong winds blew all afternoon and most of the evening. West winds were sustained to 62 mph.  The strong winds blew down signs and broke windows.  Buggies and vehicles of all kinds were blown over.  Smokestacks and chimneys were toppled.  Roofs were blown off.  The Denver and Rio Grande Railroad car shop was partially unroofed and had a wall blown down.  Three railroad cars were blown off the track.  Many fences were damaged.

In 1897…west winds were sustained to 46 mph with gusts to 56 mph.

In 1912…northwest winds were sustained to 44 mph with a measured extreme velocity to 45 mph.

In 1921…west winds were sustained to 46 mph.

In 1972…wind gusts to 58 mph were recorded at the National Bureau of Standards in Boulder.  In downtown Boulder…a wind gust to 51 mph was measured.  Northwest winds gusted to 41 mph at Stapleton International Airport.

In 1988…snowfall totaled 3 to 6 inches across metro Denver… But 9 inches were measured in both Wheat Ridge and Evergreen.  At Stapleton International Airport…3.4 inches of snow fell and northeast winds gusted to 26 mph.  The strong winds blew a scaffold against a hotel in downtown Denver…breaking three windows.

In 1995…high winds occurred in the foothills behind a departing winter storm.  A wind gust to 91 mph was recorded at Rollinsville with a gust to 82 mph atop Squaw Mountain west of Denver.  West winds gusted to only 20 mph at Stapleton International Airport.

In 2014…a peak wind gust to 59 mph…from the west… Was recorded at Denver International Airport.

» Click here to read the rest of February 14 to February 20: This week in Denver weather history

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The big chill arrives for Thornton’s weekend

Friday, February 12th, 2021 5:39am MDT

Well, we have been talking about this for a week now and it is here. Arctic air has moved in and will continue to be reinforced leading to a bitterly cold weekend.

For Friday, cloudy skies will be above and light snow / flurries will be seen much of the day. Little accumulation will be seen though. High temperatures today will top out in the upper teens. Tonight, skies will remain mostly cloudy with a few flurries. Overnight lows will push toward the zero degree mark.

Saturday looks similar to today although we might see a few periods of time when the sun peeks out. Highs will remain cold and in the mid to upper teens. Flurries will be possible throughout. Saturday night, we see the chances for snow increase and may see some light accumulations. Overnight lows Saturday night into Sunday morning dip into negative territory.

Any accumulating snow will end Sunday morning leaving only flurries. If we are lucky, we could see a couple of inches total. Sunday will be cloudy and the coldest day of the period with highs expected to only be in the single digits. Sunday night, with skies beginning to clear, lows are expected to dip well below zero.

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Thornton’s Thursday repeats cold conditions of recent days

Thursday, February 11th, 2021 4:53am MDT

A virtual clone of the weather forecast for the last couple of days. Today will offer cloudy skies and a few flakes of snow early to be followed by some clearing but with chilly temps.

Cloudy skies and some fog start us off. As with the last couple of days, a few flurries will be possible before 10:00am but with no accumulation expected. We will then see some blue sky return by mid-morning and last through the rest of the day.

Highs today will push close to the freezing mark. Breezy winds this afternoon will make it seem colder than what the thermometer reads. While cold, enjoy it because it will be next week before we see temperatures that “warm” again.

Tonight, the first push of Arctic air will be moving in leading to single digit temperatures overnight. Some light snow with minimal, if any, accumulation will be possible after midnight.

How cold will the coming days be? See the extended forecast here.

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

Wednesday, February 10th, 2021 5:13am MDT

This Week in Denver Weather History

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

From the National Weather Service:

30-7

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

31-8

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

31-12

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

1-9

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

5-11

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

6-7

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

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

6-10

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

7

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

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

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

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

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

» Click here to read the rest of February 7 to February 13: This week in Denver weather history

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Another cold one for Thornton Wednesday with conditions much like yesterday

Wednesday, February 10th, 2021 4:59am MDT

Very little difference between today’s forecast and the weather we saw yesterday. Very cold temps and perhaps a flurry start things off but then some clearing with temps remaining well below normal.

Cloudy skies and some patchy fog start us off. By mid-morning cloud cover will begin to ease. Like yesterday, a few flurries of snow will be possible in the morning but with no accumulation. High temperatures today will top out in the upper 20s, well below the average high of 45 degrees for the date.

Tonight, partly clear skies will be above with some fog possible early tomorrow morning. Lows will be in the low 10s.

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Tuesday to offer up chilly temperatures, a good bit of cloud cover

Tuesday, February 9th, 2021 5:30am MDT

We had hoped for a bit warmer day today but that doesn’t look to be in the cards. With no lower level dynamics available to move out the cold, temps will be well below normal.

Mostly cloudy skies start us off and then by mid-morning the cover will ease just a bit letting through some more sun. Overall conditions will be dry and calm. Temperatures start out quite cold, close to the single digits, and will climb but only top out in the upper 20s / lower 30s.

Tonight, skies will be mostly cloudy with overnight lows in the low teens.

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Thornton’s workweek starts off with temps near normal, colder weather on the horizon

Monday, February 8th, 2021 5:12am MDT

Monday will offer up a relatively typical day with highs near average and a good bit of sun. All eyes are currently focused on an incursion of cold air expected to send the mercury plummeting later this week.

For today, early on we will have a good bit of cloud cover, some fog, and may even have a few flakes of snow fall. That will be ending soon after sunrise though and skies will begin to clear with mostly sunny skies being above for the latter part of the day. Winds will be a bit breezy today although nowhere near as strong and persistent as yesterday. Look for highs right near the average high for the date of 45 degrees.

Tonight, cloud cover will again be increasing and overnight lows will drop to around 20 degrees.

Looking ahead, today will be the warmest day of your workweek as will get gradually colder as the week progresses. Assuming the Arctic air moves as far south as expected, highs from Friday through Sunday may not even reach the freezing mark! Have a closer look at the extended weather forecast here.

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Thornton’s weekend to feature dry and relatively calm conditions

Friday, February 5th, 2021 4:58am MDT

Not a heck of a lot exciting to talk about with this weekend’s weather as things look to be calm, temperatures at or above normal. More notable is the expected cold set to arrive next week.

For today, wave clouds are expected to setup and keep things partly sunny. High temperatures will top out right near the average high for the date of 45 degrees. Winds will be a bit breezy but shouldn’t be too bad. Tonight, skies will be partly cloudy with lows in the low to mid-20s.

Saturday brings more sun into the forecast with mostly sunny skies above throughout. Highs will again be in the mid-40s. Some, slightly breezy winds may be seen. Saturday night into Sunday morning, skies will be mostly clear and lows will drop to the mid-20s.

Sunday looks to be the warmest day of the period with highs in the low to mid-50s. Sunny skies will be above. We do expect to have some breezy winds in the afternoon.

Looking ahead, an incursion of Arctic air is expected to dive south late Monday and that will send the mercury down. Highs in the Tuesday to Thursday period may not climb above freezing. Until then, enjoy the relatively warmth of this weekend!

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