Thornton, Colorado, USA
UpdatedFri, 29-Sep-2023 7:20am MDT 


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Time to ‘spring forward’ as Daylight Saving Time begins March 12

Thursday, March 9th, 2023 5:06am MDT
Daylight Saving Time

The United States returns to Daylight Saving Time at 2:00am Sunday as Standard Time comes to an end.

The biannual ritual of changing our clocks to adjust for Daylight Saving Time occurs this Saturday night providing yet another signal of the changing of seasons.  The United States will ‘spring forward’ one hour at 2:00am Sunday morning as we begin Daylight Saving Time.

The ritual of changing our clocks twice a year can be met with some resistance as some people struggle to adjust their body’s internal clock.  The start of Daylight Saving Time can be particularly problematic given the one hour less sleep people receive on the night of the change.

However, longer days as we head into the milder months are a very real benefit and for many worth the inconvenience of a lost hour of sleep.  The time change definitely has big effects on how much daylight we enjoy during our normal waking hours.

On Saturday, prior to the change, sunset will occur at 6:02pm but on Sunday the sun won’t disappear over the horizon until 7:03pm.  This affords folks more time in the evening to get started on those spring-time chores and allows us to get outside and enjoy the warming weather.

Similarly, sunrise on Saturday is at 6:17am but shifts to 7:16am on Sunday.

The March Equinox is also on the horizon.  Spring officially begins at 3:24pm on Monday, March 20.

This year Daylight Savings Time will come to an end on November 6.

Some of the recent history of Daylight Savings Time (from Wikipedia):

Daylight saving time in the United States was first observed in 1918. Most areas of the United States currently observe daylight saving time, with the exceptions being the states of Arizona and Hawaii along with the territories of Puerto Rico, American Samoa, Guam, and the Northern Mariana Islands.

From 1987 to 2006, daylight saving time in the United States began on the first Sunday of April and ended on the last Sunday of October. The time was adjusted at 2:00 AM (0200) local time (as it still is done now).

Since 2007, daylight saving time starts on the second Sunday of March and ends on the first Sunday of November, with all time changes taking place at 2:00 AM (0200) local time.

Daylight Savings Time Schedule

Year DST Begins 2 a.m.
(Second Sunday in March)
DST Ends 2 a.m.
(First Sunday in November)
2023 12 March 2023 5 November 2023
2024 10 March 2024 3 November 2024
2025 9 March 2025 2 November 2025
2026 8 March 2026 1 November 2026
2027 14 March 2027 7 November 2027
2028 12 March 2028 5 November 2028
2029 11 March 2029 4 November 2029
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The sun and warmer temps return Thursday but so do blustery winds

Thursday, March 9th, 2023 4:56am MDT

A bit of a mixed bag of weather for Thornton today. While we will see the sun return and temperatures climb to near normal, blustery downslope winds will also be a feature of the day.

Mostly sunny skies start us off and those will give way to clear skies for much of the day. High temperatures will top out around the 50 degree mark.

Winds will be ramping up this morning with gusts pushing close to 40mph before noon. The afternoon will see winds slowly ease but remaining breezy. A Red Flag Warning will go into effect due to the elevated fire danger from the wind, low humidity and dry fuels so be careful.

Tonight, those winds will become calm after dark. Lows will dip to the mid-20s under partly cloudy skies.

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

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March 5 to March 11: This week in Denver weather history

Wednesday, March 8th, 2023 6:58pm MDT

This Week in Denver Weather History

March is Denver’s snowiest month and it is not unusual for us to receive heavy, wet snows during this time. Our look back at this week in Denver weather history highlights many such events.

From the National Weather Service:


In 1961…snowfall totaled 8.3 inches at Stapleton Airport over the 3-day period with most of the snow…4.4 inches… falling on the 3rd. Winds were generally light gusting to only 23 mph.



In 1971…heavy post-frontal snowfall totaled 7.7 inches at Stapleton International Airport where north winds gusted to 28 mph.

In 1992…snow spread from the mountains into the eastern foothills where 19 inches fell in Coal Creek Canyon. Rain fell over lower elevations of metro Denver with 1.12 inches of precipitation recorded at Stapleton International Airport and only one half inch of snow. North winds gusted to 32 mph.

In 2004…snowfall totaled 1.8 inches at the Denver Stapleton site. This was the only measurable snowfall of the month. Northeast winds gusted to 29 mph at Denver International Airport.


In 1931…a cold front with north winds gusting to 35 mph on the evening of the 4th brought snowfall on the 5th into the early morning of the 6th. Heavy snowfall totaled 6.2 inches. Temperatures plunged from a high of 58 degrees on the 4th to a low of only 22 degrees by midnight…which was also the high reading on the 5th.

In 1983…a slow moving moisture laden storm produced heavy snow and rain. Two to three feet of snow fell in the foothills at Wondervu and Nederland. The southern portion of metro Denver was buried with 26 inches of snow in southeast Aurora…25 inches at Franktown…and 19 inches at Littleton. Snowfall totaled 18.7 inches at Stapleton International Airport with most of the snow…18.0 inches… Falling on the 5th. Brighton received only 11 inches of new snow. Boulder was drenched by rain and received no snow. Precipitation from the storm totaled 3.06 inches at Stapleton International Airport where north winds gusted to 28 mph. The heavy wet snow snapped many tree limbs…which fell on power and phone lines causing many outages. Numerous highways were closed. Two thousand travelers were stranded at Stapleton International Airport where only one runway was open for a time. Many flights were canceled. One home in Denver was severely damaged when its roof collapsed under the weight of the heavy snow. The 2.68 inches of precipitation on the 5th was the greatest calendar day precipitation ever recorded in the city during March. The 2.79 inches of precipitation on the 4th and 5th was the greatest 24 hour precipitation ever measured during March.


In 1887…the longest snow-free period on record…232 days…  Began.  The last measurable snowfall of the season…0.1 inch…occurred on the 4th.  The first measurable snow of the next season…0.3 inch… Occurred on October 23rd.

In 1900…northwest winds were sustained to 51 mph with gusts to 60 mph.  The strong Bora winds warmed the temperature to a high of 44 degrees.

In 1926…post-frontal north winds were sustained to 44 mph with gusts as high as 54 mph.  The cold front also produced a thunderstorm.

In 1990…the southern portion of metro Denver was hit by a line of thunderstorms.  Heavy rain…0.90 to 2.40 inches…  And pea to marble size hail piled to a depth of 2 to 3 inches over portions of northern and eastern Douglas and western Arapahoe counties.  Thunderstorm winds to 50 mph were clocked at Centennial airport.  Thunderstorm rainfall was 0.62 inch at Stapleton International Airport.


In 1935…3.0 inches of snow fell in downtown Denver. This was the only measurable snow of the month. Northwest winds gusted to 29 mph on the 5th.

In 1940…heavy snowfall totaled 9.1 inches over downtown Denver. North winds gusted to 22 mph.

In 2000…high winds developed in and near the foothills just prior to the passage of an upper level storm system moving in from the west. Peak gusts from the windstorm included: 88 mph at the National Center for Atmospheric Research near Boulder…82 mph in Boulder…80 mph at the national wind technology center south of Boulder…79 mph on Rocky Flats…and 71 mph in Golden Gate Canyon. Several power lines were downed causing a few brief outages. Thunderstorms produced southeast wind gusts to 51 mph at Denver International Airport on the 5th.

In 2003…high winds spread from the mountains down the eastern slopes. The highest wind gusts were 85 mph atop the Gamow Tower on the University of Colorado campus in Boulder and 70 mph at the national wind technology center on Rocky Flats west of Broomfield. West winds gusted to 44 mph at Denver International Airport on the 6th.

In 2018…high winds developed in and near Denver. Peak wind gusts included 79 mph in Applewood…60 mph at Denver International Airport…and 59 mph near Bennett.


In 1900…west winds were sustained to 41 mph with gusts to 49 mph.

In 1920…the high temperature warmed to only 6 degrees… The all-time record low maximum temperature for the month of March. The same reading also occurred on March 10…1948.

In 1972…a wind gust to 100 mph was recorded at Jefferson County Airport in Broomfield. Winds gusted in Boulder at speeds of 50 to 65 mph. A light plane was overturned… And there was damage to other planes at Boulder airport. The roof of a garage was blown off…and a mobile home was overturned in Boulder. A truck was blown off the highway 15 miles east of Boulder. West winds gusted to 51 mph at Stapleton International Airport. The warm Chinook winds were responsible for setting a new record high temperature for the date of 75 degrees…exceeding the old record of 72 degrees set in 1925.

In 1990…a blizzard pummeled metro Denver. Snow fell at a rate of 2 to 3 inches an hour. Gusty north winds whipped the snow into 2- to 3-foot drifts by noon. During the afternoon many stores and schools closed. By rush hour sustained winds of 35 to 46 mph and gusts to 58 mph reduced visibilities to near zero and whipped the new snow into 3- to 4-foot drifts. Many residential as well as secondary and primary roads became impassable. I-25 and I-70 were closed in and out of the city. Road crews cleared drifts as high as 12 feet in southeast Boulder and northwest Adams counties. Several hundred rush hour commuters…including the state’s governor…were caught in the blizzard conditions along a 15-mile stretch of the Denver-Boulder turnpike. Many remained snowbound in their vehicles up to 8 hours until rescued by police and the National Guard. The highway remained closed until mid-day on the 7th. Shelters for stranded commuters and travelers were opened in Broomfield and Castle Rock. Many workers didn’t even try to go home…but filled downtown hotels to near capacity. By early evening…Stapleton International Airport was shut down after an airliner with 82 passengers aboard skidded off a runway. Snowfall totals for the storm varied from 18 to 50 inches in the foothills above 6 thousand feet…9 to 24 inches west of I-25…and 2 to 12 inches over eastern metro Denver. Snowfall from the storm totaled 11.8 inches at Stapleton International Airport where the maximum snow depth on the ground was 7 inches due to melting.

In 2004…very strong downslope winds developed in and near the eastern foothills…causing numerous traffic accidents and extensive property damage to roofs and aluminum sheds. Three semi-trucks were toppled by the strong winds near the I-70 and C-470 interchange. One of the trucks was carrying a modular home…while another was hauling hazardous material. I-70 had to be closed in both directions until the accidents could be cleaned up. Strong winds forced the closure of State Highway 93 between Golden and Boulder…when the road became icy and snowpacked from localized ground blizzards. Another semi- truck was blown over near the intersection of State Highways 72 and 93 atop Rocky Flats. Scattered power outages were reported across northern and western sections of metro Denver…affecting around 2000 residents. In Boulder…several pine trees were uprooted by the high winds.

In 2017…strong winds combined with very dry conditions produced extreme fire danger across the region. In Aurora… fire crews responded to a brush fire near Gun Club Road and Jewell Avenue. It burned approximately 290 acres before it was contained. Strong winds also downed a tree which crushed a parked car in a driveway. Peak wind gusts included: 83 mph…5 miles south of Berthoud; 63 mph at Centennial… 58 mph near Bennett and at Denver International Airport.


In 1981…a storm dumped 4 to 8 inches of snow over higher elevations between Denver and Colorado springs. At Stapleton International Airport…north winds gusted to 16 mph and snowfall totaled only 2.5 inches.

In 1998…heavy snow fell over portions of metro Denver and the adjacent foothills. Snowfall totals included 11 inches at Chief Hosa…10 inches near Evergreen…8.5 inches in Broomfield…8 inches at Bailey…and 7 inches at both Standley Lake and Thornton. Elsewhere…snowfall across metro Denver ranged from 3 to 6 inches with 4.9 inches measured at the site of the former Stapleton International Airport. North winds gusted to 26 mph at Denver International Airport on the 7th. Several accidents occurred along area roads and highways when they became icy and snowpacked.


In 1932…snowfall totaled 6.3 inches in downtown Denver. Most of the snow…5.2 inches…fell on the 8th. Northeast winds gusted to 20 mph on the 6th.


In 1872…heavy rain started shortly after midnight and soon turned to sleet…which continued to just after sunrise…the ground at that time not even being white. At about 7:00 am the worst snow storm of the winter commenced and continued until 10:00 pm…snowing heavily nearly all the time. North winds averaged a sustained speed of 25 mph. About 8 inches of snow fell…but it drifted too much to obtain a direct measurement.

In 1901…northwest winds were sustained to 40 mph with gusts as high as 58 mph. The strong Chinook winds warmed the temperature to a high of 70 degrees.

In 1902…northwest winds were sustained to 45 mph with gusts to 53 mph.

In 1950…strong north winds at 40 mph with gusts as high as 60 mph produced a dust storm across metro Denver. At Stapleton Airport…blowing dust reduced visibility to as low as 1/4 mile for most of the day.

In 1972…northwest winds gusted to 51 mph at Stapleton International Airport. The Chinook winds warmed temperatures to a high of 64 degrees.

In 1984…a wind gust to 63 mph was recorded at Golden Gate Canyon west of Denver. West winds gusted to 39 mph at Stapleton International Airport.

In 2017…strong winds occurred across the north central and northeast Colorado. In west Greeley…a building under construction completely collapsed. The 5000 square-foot addition to a church swayed under the force of the wind then collapsed. Some of the debris pinned a construction worker; he suffered minor injuries. Peak wind gusts included: 81 mph at Berthoud Pass and Genesee; 75 mph near Jamestown…60 mph…2 miles south-southeast of Denver International Airport and 55 mph at Greeley Airport. Officially…a peak wind gust to 46 mph was measured at Denver International Airport from the northwest. » Click here to read the rest of March 5 to March 11: This week in Denver weather history

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Wednesday continues the chill but with overall dry and calm conditions

Wednesday, March 8th, 2023 5:00am MDT

Just the slightest bit of improvement in Thornton’s weather today. We will warm up a bit and should see a touch of sun later in the day.

Cloudy skies start us off and then they will gradually ease leading to mostly cloudy skies for much of the rest of the day. Winds will be just a touch breezy in the mid-afternoon. High temps will top out around 40 degrees.

Tonight, mostly cloudy skies will be above with lows in the mid-20s. We will have a slight chance to see some flakes of snow overnight but no accumulation is expected.

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A cold and dreary day for Thornton’s Tuesday

Tuesday, March 7th, 2023 4:58am MDT

Kind of one of those ‘blah’ days ahead without much to redeem it. Clouds, fog, some freezing drizzle will be the highlights.

Cloudy skies start us off and will remain throughout the day. The morning may see some areas of fog. Freezing drizzle has been slow to develop but is being seen in spots and will continue through about 10:00am. Definitely exercise caution on your morning commute. Look for highs today only in the mid-30s.

Tonight, the clouds will remain with overnight lows in the mid to upper 20s. Freezing drizzle will again be possible overnight.

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Monday in Thornton to offer up calm conditions, lots of sun

Monday, March 6th, 2023 4:54am MDT

A rather tranquil day to start off the workweek. Tonight, however, we begin to signs of a turn toward wintry weather.

Mostly sunny to sunny skies will be above today. Winds will be light and out of the north. High temperatures will top out in the mid to upper 40s.

Tonight, cloud cover will be increasing and after midnight through the first part of tomorrow morning there may be some freezing drizzle and rain. Of course that will require caution if driving overnight and during tomorrow morning’s commute.

Lows tonight will be in the mid-20s.

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Thornton’s weekend starts with a touch of snow, then dries up, temps near normal

Friday, March 3rd, 2023 5:01am MDT

Largely typical weather for the three-day period of the first weekend of March. We do have a chance for snow late today but then the rest of the weekend will be dry.

Friday will have partly clear skies above throughout with highs reaching near 50 degrees. Mid to late afternoon we may see a sprinkle of rain then as the temperature drops, a transition to snow. If we see any accumulation, it will be less than a half inch and end by about 10:00pm. Tonight, skies remain partly clear with lows in the low 20s.

Saturday will be a calm day with partly sunny skies above. Highs will top out in the mid to upper 40s. Saturday night, lows dip to the mid-20s under mostly clear skies.

Sunday will be the warmest of the period but also feature some wind. Look for highs in the mid-50s under mostly sunny skies. Breezy winds can be expected from late morning through the evening.

Have a great weekend!

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Thursday in Thornton to bring cool, calm conditions

Thursday, March 2nd, 2023 5:00am MDT

Following our light shot of snow late yesterday, we dry out today with what will actually be a pleasant day. Temps will be a bit below normal but conditions will be calm.

Mostly sunny skies will be above throughout the daytime hours. Overall conditions will be calm and dry. High temperatures will top out in the mid-40s.

Tonight, clouds will be increasing as another weak system approaches. Overnight lows will be in the mid-20s.

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Weak system to chill Thornton out Wednesday, possibly bring a touch of snow

Wednesday, March 1st, 2023 4:59am MDT

A return to wintry conditions today as a system moves through. It will, however, be more of a show for the mountains with little effect for us.

Mostly cloudy skies will be above throughout the day today. Temperatures will be chilly with highs in the low to mid-40s. Breezy winds this afternoon will make it feel colder.

After noon we begin to see some chances for snow that will last through tonight. At this time, we aren’t expecting much at all in terms of the white stuff, maybe a half inch or so between noon today and dawn tomorrow.

Tonight, flurries / light snow will be seen. Lows will drop to around 20 degrees.

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Cool temperatures, windy conditions for Tuesday in Thornton

Tuesday, February 28th, 2023 5:00am MDT

Batten down the hatches because here comes the wind. While we will be a bit warmer than normal, wind today will prevent enjoyment of the outdoors.

Mostly sunny skies will be with us throughout the daytime hours. High temperatures will top out near the 50 degree mark. Winds will be light initially but then be increasing in speed through the morning. By this afternoon, it will be quite windy with gusts to 40+ mph being possible.

This evening, winds will slowly decrease, finally becoming calm close to midnight. Overnight lows will be around 20 degrees under partly cloudy skies.

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

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