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Thornton, Colorado, USA
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Thornton’s weekend weather starts calm and quiet, will end colder, a bit unsettled

Friday, January 22nd, 2021 5:13am MST

A little bit of a mixed bag of weather for the three day period. Friday and Saturday will be calm with temps near normal, then a cold front moves in mixing things up Saturday night and Sunday.

For Friday, we will see clouds increase through the day but overall mostly sunny skies will be above. High temperatures will be in the mid-40s. Friday night, partly cloudy skies will be above with lows in the low to mid-20s.

Saturday looks similar to today but will be a bit warmer. Highs will reach to near 50 degrees under mostly sunny skies. A cold front moves in late in the day Saturday and that may allow for a flurry or two in the evening. Saturday night, mostly cloudy skies will be above with lows in the low to mid-20s.

Sunday we’ll see a good bit of cloud cover and highs will only reach the mid to upper 30s. Some light snow with minimal, if any, accumulation will be possible, mainly from noon into the evening.

Have a great weekend!

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Thursday in Thornton to offer more clouds, calm conditions, temps a bit above normal

Thursday, January 21st, 2021 5:01am MST

An uneventful weather day for us. A weak cold front will lead to increased moisture aloft and thus some clouds but otherwise have little effect.

Partly sunny skies will be the general rule for the day with a few more clouds in the afternoon. Winds will be light, conditions calm and dry. Highs today will top out near the 50 degree mark.

Tonight, partly cloudy skies will be above with lows dropping to around 20 degrees.

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Mild temperatures but with breezy winds for Wednesday

Wednesday, January 20th, 2021 4:59am MST

Not too bad of a day ahead for Thornton. We will enjoy lots of sun and temps well above normal. There will, however, be some breezy winds as well.

Sunny skies start us off and will be with us throughout the day. Winds will be out of the west and a bit breezy, particularly from mid-morning to late afternoon. The downslope flow will help push high temperatures today to the mid to upper 50s.

Tonight, winds will ease by sunset then we will see calm conditions under mostly clear skies. Overnight lows will drop to the upper 20s.

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Clouds will clear Tuesday but chilly temperatures will remain

Tuesday, January 19th, 2021 5:07am MST

Yesterday’s passing system is moving out and as it does, we see improving conditions today. Temperatures will remain on the chilly side but clouds will be easing.

The day starts off with partly clear skies. Coverage will ease throughout the morning leading to mostly sunny skies in the afternoon. High temperatures today will top out in the upper 30s.

Tonight, skies will be mostly clear with overnight lows around 20 degrees.

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Cool, unsettled weather conditions for Martin Luther King Jr. Day in Thornton

Monday, January 18th, 2021 4:58am MST

A passing system will mix things up for us today. Cooler temperatures, a good bit of a clouds and perhaps a dusting of snow can be expected.

Partly cloudy skies start us off then in the afternoon coverage will increase. Winds will be out of the north and a bit breezy, particularly from mid-morning on. High temperatures today will top out in the low to mid-40s.

As for the snow, we may see a few flakes as early at 4:00 or so with better chances coming from 7:00pm to 1:00am. Little, if any accumulation is expected however.

Tonight, lows will drop to the low 20s. Any snow will end by about 3:00am.

What lies ahead for the rest of the workweek? See our extended forecast here.

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

Sunday, January 17th, 2021 4:59am MST

This Week in Denver Weather History

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

From the National Weather Service:

14-21

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

15-23

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

16-17

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

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

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

16-18

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

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

17

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

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

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

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

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

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

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

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

17-18

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

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

18

In 1874…light rain…rare in January…changed to snow which totaled 3 inches.

In 1959…strong gusty winds caused damage to buildings… Airplanes…trees…and a radio tower in Boulder… Broomfield…Denver…and Longmont.  A wind gust to 70 mph was recorded in Longmont.  In Boulder…the top of a radio tower was toppled and signs…trees…and trailer houses were blown over.  In southwest Denver…a mother and child were injured when their car was struck by a sign that had blown loose in the wind.  Minor damage to buildings and power lines was reported in the area.  Northwest winds gusted to 38 mph at Stapleton Airport.  Post-frontal east northeast winds gusted to 40 mph.

In 1961…northeast winds gusted to 29 mph and snowfall totaled only 0.1 inch at Stapleton Airport…but 2 to 7 inches of snow fell in the foothills west of Denver.

In 1975…a strong cold front roared through metro Denver producing north wind gusts to 52 mph and briefly reducing the visibility at Stapleton International Airport to less than 5/8 mile in blowing dust.  The windstorm caused considerable damage to utility lines…homes…fences… Commercial buildings…autos…and schools.  Heaviest damage was near the foothills where winds hit 80 mph at Boulder and at Rocky Flats northwest of Denver. The cold front caused temperatures to drop 13 degrees in one hour.  Temperatures fell from a maximum of 61 degrees in the early afternoon to a minimum of 31 degrees before midnight.

In 1984…the coldest morning of the new year produced record breaking temperatures with a low of 19 degrees below zero for the date at Denver.  Many other cities also reported record cold.

In 1985…highs winds occurred in the foothills with gusts reported to 60 mph at Evergreen.  Northwest winds gusted to 38 mph at Stapleton International Airport.

In 1986…wind gusts to 60 mph were reported in Boulder. West winds gusted to 31 mph at Stapleton International Airport.

In 1999…damaging downslope winds caused problems in the foothills.  In Eldora…the roof was blown off an a-frame house.  Peak wind gusts included:  100 mph at Central City…84 mph at Wondervu…77 mph atop Blue Mountain… 75 mph in Golden Gate Canyon…72 mph at the Rocky Flats Environmental Test Facility…and 70 mph at the National Center for Atmospheric Research Mesa Laboratory near Boulder.  West winds gusted to 36 mph and warmed the temperature to a high of 63 degrees…the highest reading of the month at Denver International Airport.

In 2006…high winds occurred in northern Jefferson and southern Boulder counties.  A peak wind gust to 81 mph was recorded near superior along with a gust to 80 mph near Boulder.  Five teenagers started a grassfire near Plainview atop Rocky Flats.  The high winds coupled with very dry conditions allowed the fire to quickly spread…forcing the evacuation of dozens of residents and the closure of State Highways 93 and 72.  The fire consumed 2700 acres and destroyed two outbuildings.  No homes were damaged and no one was injured by the blaze. West winds gusted to 30 mph at Denver International Airport.

18-19

In 1980…a slow moving storm deposited 4 to 10 inches of snow across metro Denver with the greatest amounts in the foothills.  Flights were delayed 30 to 40 minutes at Stapleton International Airport where snowfall totaled 5.5 inches and north winds gusted to 22 mph.

In 1988…a blizzard produced strong winds and heavy snow across eastern Colorado.  Ten-foot drifts were common and many roads were closed including I-70…I-76…and I-25. In the Denver area…4.0 inches of snow fell at Stapleton International Airport where north winds gusting to 40 mph reduced the visibility to 1/2 mile at times.

18-20

In 1958…snowfall totaled 6.9 inches at Stapleton Airport where east-northeast winds gusted to 26 mph on the 18th.

18-24

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

» Click here to read the rest of January 17 to January 23: This week in Denver weather history

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Thornton’s weekend weather to feature temps near normal, some wind

Friday, January 15th, 2021 4:58am MST

We will see pretty typical, mid-January weather this weekend. Temperatures will be near normal and there will be some wind initially.

Friday will offer sunny to mostly sunny skies above. Temperatures will be in the mid to upper 40s. Winds will be breezy, especially in the morning, then easing some in the afternoon. Tonight, skies will be mostly cloudy with overnight lows dropping to the mid-20s.

Saturday starts out with a good bit of cloud cover but those should ease leaving mostly sunny skies for the latter part of the day. Highs will be in the mid-40s with some breezy winds. Saturday night into Sunday morning, mostly cloudy skies will cover us with lows in the low 20s.

Sunday will offer temps near the other two days in the mid to upper 40s. Partly clear skies will be above.

Have a great weekend!

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Chilly temperatures and blustery winds for Thornton’s Thursday

Thursday, January 14th, 2021 4:58am MST

A cold front has pushed through and with it, colder temperatures will be on tap today. The bigger story will be the wind, a healthy dose of it, that will persist all day.

Sunny to mostly sunny skies will be above throughout the daytime hours. Temperatures will be chilly with highs reaching around 40 degrees. Winds will be quite breezy all day, particularly around mid-day and into the afternoon. High Wind Warnings surround us but at this time we do not fall under them.

Tonight, winds will ease some but remain breezy. Skies will be mostly clear and overnight lows will drop to around 20 degrees.

Keep an eye on those wind speeds with our live gauges here.

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Thornton to enjoy mild temperatures Wednesday but with a good dose of wind

Wednesday, January 13th, 2021 5:04am MST

Downslope winds are going to be the main feature for our weather today. While they will allow us to have a mild day, the wind will be blustery at times.

Mostly sunny skies start us off today then we will see cloud cover increase by late morning / early afternoon. Winds will be a bit breezy early then pick up speed in the afternoon. Temperatures will be quite mild, aided by the downslope flow. Look for highs near the 60-degree mark.

Tonight, partly cloudy skies will be above with continuing breezy conditions. Speeds will actually be increasing after midnight, foretelling a windier day tomorrow. Overnight lows will be in the mid-20s.

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

Wednesday, January 13th, 2021 4:54am MST

This Week in Denver Weather History

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

From the National Weather Service:

7-10

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

8-10

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

9-10

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

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

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

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

10

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

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

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

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

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

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

In 1990…a third consecutive day of 50 to 85 mph wind gusts occurred in and along the eastern foothills.  A 5 mile portion of the Denver-Boulder turnpike was closed after clouds of blowing dust and gravel caused several multicar accidents near Broomfield.  One 59-year-old woman was killed and two others injured.  A wind gust to 81 mph was recorded at the nearby Jefferson County Airport. In Boulder…wind gusts to 85 mph were blamed for ripping off a portion of a roof on a house…as well as blowing out the large picture window.  West winds gusted to 41 mph at Stapleton International Airport.  The warm Chinook winds set a record high temperature of 71 degrees in Denver for the date.

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

10-11

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

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

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

10-12

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

10-13

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

11 » Click here to read the rest of January 10 to January 16: This week in Denver weather history

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