Thornton, Colorado, USA
UpdatedTue, 22-Sep-2020 1:55pm MDT 


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‘Springing forward’ as Daylight Saving Time to begin Sunday, March 8th

Saturday, March 7th, 2020 6:10am MDT
The United States returns to Daylight Saving Time at 2:00am Sunday, March 8, 2020.

The United States returns to Daylight Saving Time at 2:00am Sunday, March 8, 2020.

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 5:59pm but on Sunday the sun won’t disappear over the horizon until 7:00pm.  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.

The March Equinox is also on the horizon.  Spring officially begins at 9:49pm on Thursday, March 19.

This year Daylight Savings Time will come to an end on November 1.

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)
2020 8 March 2020 1 November 2020
2021 14 March 2021 7 November 2021
2022 13 March 2022 6 November 2022
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
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Thornton’s weekend weather to offer up very spring-like conditions

Friday, March 6th, 2020 4:57am MDT

We technically have a couple more weeks of winter to go but Mother Nature is giving us a bit of a preview of the season to come. The weekend will feature unseasonably warm temperatures with lots of sun for much of it, showers to close it out.

Friday we will enjoy sunny to mostly sunny skies above. High temperatures will push to the mid to upper 60s. Overnight tonight, partly cloudy skies will be above with lows in the mid-30s.

Saturday offers up a day much like today with lots of sun. Highs will again be in the upper 60s, perhaps crack the 70 degree mark. Saturday night into Sunday morning, partly cloudy skies will be above with lows in the upper 30s.

A weak system moves through Sunday and that will bring increased cloud cover and just a chance for afternoon and evening rain showers. Temperatures will remain unseasonably warm with highs in the mid-60s.

Enjoy the weather and have a great weekend!

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Thursday brings cooler temperatures, conditions remain calm

Thursday, March 5th, 2020 4:48am MDT

A cold front moved through last night and that will bring a brief interruption to the warmup we have been experiencing. Temperatures will return to near normal levels but it will be calm.

The day starts off with a good bit of cloud cover but those should decrease quickly this morning leading to sunny skies for much of the day. High temperatures today will be in the low to mid-50s.

Tonight, mostly clear skies will be above with low temperatures around the 30 degree mark.

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A warm Wednesday with temps well above normal, clear skies

Wednesday, March 4th, 2020 4:53am MDT

Thornton will enjoy another beautiful day today. Mercury readings will top out 10+ degrees above normal with clear, blue skies above.

Sunny skies start us off and while we may see a few clouds in the afternoon, they won’t amount to much. Winds will be light this morning then become a bit breezy in the afternoon and evening. High temperatures today will top out in the mid-60s.

Tonight, skies will be clear with overnight lows dropping to around 30 degrees.

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February 2020 weather recap: Colder than normal temps, above normal snowfall

Tuesday, March 3rd, 2020 6:38pm MDT

Certainly when you look back on February 2020, you probably will remember it as being cold and snowy. That indeed is true, as the numbers show, however that really only pertained to the first half of the month. The latter part was far more on par with what we expect to see.

The month did start out quite warm as we saw temperature readings well above normal on the first and second. The third, however, brought about significant changes and an end to the warmth that had carried over from January.

Several storm systems moved through over the next 10 days, bringing significantly colder temperatures and regular doses of snow. Indeed, 8 of the first 12 days of the month brought measurable snowfall. Into the third week of the month it appeared we were on pace for one of the coldest Februarys on record.

Things changed again on the 21st and five of the last nine days of the month brought warmer than normal temperatures. This was enough to drive up our average temperature which, while it did come in well below normal, was not in record-setting territory.

Thornton’s average temperature for the month came in at 29.9 degrees. This was a good ways below Denver’s long term average for February of 32.5 degrees. Out at Denver International Airport where the Mile High City’s official measurements are taken, it actually was colder with an average of 28.1 degrees.

Our temperatures ranged from a high of 73.7 degrees on the 2nd down to a low of -2.2 degrees on the morning of the 5th. Out at DIA, they saw their warmest and coldest temperatures of 74 degrees and -5 degrees on the same dates.

Precipitation came in well above the Denver average for the month of 0.37 inches. Thornton recorded 1.09 inches while Denver measured 0.88 inches.

Snow was of course notable for the first half of the month and drove the monthly totals. On average, Denver receives 5.7 inches in February.  Thornton far surpassed that with 22.1 inches and Denver did as well with 16.5 inches of the white stuff.

Click here to view Thornton’s February 2020 climate report.

Thornton, Colorado's February 2020 Temperature Summary. (ThorntonWeather.com)

Thornton, Colorado’s February 2020 Temperature Summary. (ThorntonWeather.com)

Thornton, Colorado's February 2020 Precipitation Summary. (ThorntonWeather.com)

Thornton, Colorado’s February 2020 Precipitation Summary. (ThorntonWeather.com)

717 AM MST SUN MAR 1 2020




                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
 HIGH              80   02/10/2017
 LOW              -25   02/01/1951
HIGHEST            74   02/02        66       8       65  02/03
LOWEST             -5   02/05                -4      -11  02/07
AVG. MAXIMUM     39.9              46.2    -6.3     40.8
AVG. MINIMUM     16.3              18.9    -2.6     15.3
MEAN             28.1              32.5    -4.4     28.0
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     10               3.9     6.1        8
DAYS MIN <= 32     28              26.9     1.1       26
DAYS MIN <= 0 2 1.3 0.7 3 PRECIPITATION (INCHES) RECORD MAXIMUM 2.01 1934 MINIMUM 0.01 1970 TOTALS 0.88 0.37 0.51 0.72 DAILY AVG. 0.03 0.01 0.02 0.03 DAYS >= .01         9               5.3     3.7        6
DAYS >= .10         4               0.7     3.3        3
DAYS >= .50         0               0.0     0.0        0
DAYS >= 1.00        0               0.0     0.0        0

 24 HR. TOTAL    0.19     02/12

TOTALS           16.5               5.7             13.4  2019
RECORD           22.4      2015

HEATING TOTAL    1063               908     155     1029
 SINCE 7/1       4499              4468      31     4417
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0        0

 EARLIEST     09/08/1962
 LATEST       06/08/2007
EARLIEST                        10/07
LATEST                          05/05

AVERAGE WIND SPEED              10.3

AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            8
NUMBER OF DAYS PC             13


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Thornton’s March 2020 weather preview: Warmer temps arrive, significant snows possible

Tuesday, March 3rd, 2020 8:12am MDT

The month of March in Denver is usually one that is welcomed heartily by residents. We begin to shake off the cold of winter with warmer temperatures and calmer conditions. That does not mean we are done with snow and cold by any means.

March usually offers healthy snowfall giving us an opportunity to add to our seasonal totals.  While there is good snow potential in March, the month also typically brings much warmer temperatures.

March is historically Denver’s snowiest month and brings about 20% of our annual snowfall.  Heavy, wet spring snow storms can oftentimes bring the entire month’s snowfall total in one monstrous snow.

We also start the transition to spring and severe weather season and the month typically brings our first thunderstorms of the year.  Temperatures climb throughout the month and by the end our average daytime highs are near 60 degrees.

For a complete look at what lies ahead in March 2020, click here.

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Lots of sun, temperatures a bit above normal for Tuesday

Tuesday, March 3rd, 2020 5:22am MDT

A very nice looking late winter day ahead for Thornton. We will see mercury readings a few degrees above normal with lots of that Colorado blue above.

The day starts with sunny skies and we should remain similarly clear throughout. High temperatures today will top out in the upper 50s, a good bit above the average high for the date of 51 degrees.

Tonight, we remain mostly clear with overnight lows dipping to the upper 20s.

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Start of Thornton’s workweek to see calm conditions, cool temperatures

Monday, March 2nd, 2020 5:01am MDT

Our most recent snow deposited 1.4 inches on us, not much at all but enough to coat the grass white. Today we dry out and warm right back up, a trend that will continue into the coming weekend and bring unseasonably warm temps.

Mostly cloudy skies start us off today but those will clear through the morning leading to mostly sunny skies for much of the day. Temperatures will be a bit below normal with highs in the mid to upper 40s.

Tonight, skies remain mostly clear with overnight lows in the mid-20s.

Looking ahead, unseasonably warm temperatures will be the general rule for the balance of the week. Get a preview here.

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March 1 to March 7: This week in Denver weather history

Sunday, March 1st, 2020 4:30pm MDT

This Week in Denver Weather History

Looking at this week in Denver weather history, it is easy to see why March is known as Denver’s snowiest month. There are numerous instances of major winter storms dumping snow on the city that was measured not in inches – but feet!

From the National Weather Service:


In 1875…6 inches of snow fell from 3:15 pm on the 28th to 1:00 am on the 1st. Precipitation for the two days was 0.50 inch.


In 1896…snowfall totaled 5.5 inches in the city. Northeast winds gusted to 24 mph.

In 1948…snowfall totaled 5.9 inches in downtown Denver. North winds were sustained to 15 mph.


In 1904…west winds were sustained to 42 mph with gusts as high as 58 mph. The Chinook winds warmed the temperature to a high of 67 degrees.

In 1906…snowfall was heavy and totaled 7.5 inches over downtown Denver. Northeast winds were sustained to 37 mph.

In 1940…snowfall was heavy and totaled 7.7 inches in downtown Denver.

In 1943…6.0 inches of snow fell over downtown Denver. North winds were sustained to 19 mph.

In 1956…west-northwest wind gusts to 52 mph were recorded at Stapleton Airport.

In 1961…a wind gust to 65 mph was recorded at the Colorado building in downtown Boulder. The high winds caused some minor damage. Northwest winds gusted to 43 mph at Stapleton International Airport.

In 1974…a wind gust to 77 mph was recorded in Boulder. Southwest winds gusted to 37 mph at Stapleton International Airport.

In 2002…upslope conditions caused heavy snow to develop in and near the eastern foothills. Snow totals included 14 inches at Eldorado Springs and near Genesee; 13 inches atop Lookout Mountain; 12 inches in Coal Creek Canyon; 10 inches in Nederland and just east of Boulder; 9 inches in Boulder and Morrison; and 8 inches at Broomfield…Erie… Golden…Louisville…and Littleton. Snowfall totaled 6.5 inches at the site of the former Stapleton International Airport. Northeast winds gusted to 31 mph at Denver International Airport.

In 2014…a localized band of heavy snow over downtown Denver produced around one inch in less than 30 minutes and contributed to a chain of accidents in the northbound lanes of Interstate 25…between Logan Street and University Blvd. The combination of excessive speed and very poor driving conditions led the chain reaction; it involved 104 vehicles and resulted in one death along with 30 injuries. The interstate was closed for approximately 5 hours. At Denver International Airport…1 inch of snow was observed.


In 1969…heavy snowfall totaled 7.0 inches at Stapleton International Airport where north-northwest winds gusted to 18 mph.

In 1988…3 to 6 inches of snow fell over metro Denver. Snowfall totaled 3.2 inches at Stapleton International Airport where north winds gusted to 32 mph.

In 2003…localized heavy snow developed in the foothills of Jefferson County. Storm totals included: 12.5 inches near Conifer…11 inches in the foothills southwest of Boulder…and 10 inches near Genesee. Only 0.9 inch of snow fell at the site of the former Stapleton International Airport.


In 1904…west winds sustained to 52 mph with gusts to 60 mph warmed the temperature to a high of 68 degrees. Snowfall was 0.4 inch in the evening.

In 2008…a storm system brought heavy snow to portions of the Front Range foothills; as well as localized blizzard conditions to areas along the palmer divide. In the foothills of Jefferson and Park counties storm totals included: 16 inches at Genesee…14 inches…4 miles south of Evergreen; 13 inches…3 miles southeast of Pinecliffe; 12 inches…5 miles west-southwest of Conifer; 10 inches at Evergreen and 5 miles west of Littleton. Along the Palmer Divide…south and southeast of Denver… The combination of gusty northerly winds and snow caused localized blizzards. Storm totals included: 7 inches… 2 miles east of Castle Rock; 6 inches…4 miles east of Parker and 2 miles northwest of Elizabeth; and 5 inches near Castle Pines. The wind…gusting to 35 mph…stirred up snow drifts from 1 to 3 feet in depth. Northeast winds gusted up to 49 mph at Denver International Airport; and 2.0 inches of snow was observed at the former Stapleton International Airport.


In 1901…strong northwest winds raked the city for 2 days. On the 2nd…winds were sustained to 55 mph with gusts to 62 mph. The Chinook winds warmed the temperature to a high of 72 degrees…a record maximum for the date. On the 3rd…winds were sustained to 61 mph with gusts as high as 65 mph. The high temperature was 59 degrees.

In 1964…heavy snowfall of 6.3 inches was measured at Stapleton International Airport. East winds gusted to only 20 mph behind a cold front.

In 1978…5.0 inches of snowfall were measured at Stapleton International Airport where northeast winds gusted to 24 mph on the 2nd. The passage of a cold Canadian front kept temperatures only in the teens and 20’s on the 2nd after a high temperature of 33 degrees shortly after midnight. The temperature…after a morning low of 3 degrees below zero…climbed to only 14 degrees on the 3rd…setting a record low maximum for the date.


In 1963…heavy wet snow was accompanied by strong gusty winds across metro Denver. Snowfall totaled 11.6 inches at Stapleton Airport where north winds gusting to 44 mph caused much blowing and drifting snow. Hazardous driving conditions resulted in many traffic accidents.

In 1976…snowfall totaled 8.0 inches at Stapleton International Airport where…on the 4th…northeast winds gusted to 31 mph reducing the visibility to as low as 1/4 mile. Maximum snow depth on the ground was 7 inches. Nine inches of snow were measured in Boulder.


In 1875…six inches of snow fell in Georgetown.

In 1895…northwest bora winds were sustained to 45 mph with gusts to 58 mph in the city.

In 1966…cold northwest wind gusts of 50 to 90 mph occurred across metro Denver. Both cars and trucks were blown off an icy highway just east of Denver where some highways were closed by either blowing dust or blowing snow. A northwest wind gust to 43 mph was recorded at Stapleton International Airport. The strong winds caused limited minor damage.

In 1972…winds gusted to 55 mph in Boulder causing no reported damage. West winds gusted to 49 mph at Stapleton International Airport.

In 1985…snow struck metro Denver. Heaviest hit was Boulder where 6 to 8 inches were measured. Icy roads caused the closure of I-25 north and south of Denver due to traffic accidents. The snow also caused long delays at Stapleton International Airport where snowfall totaled only 2.6 inches.

In 1997…west winds gusted to 52 mph at Denver International Airport.


In 1932…a dust storm occurred on the 3rd during the late afternoon. North winds gusting as high as 38 mph behind a cold front kicked up much blowing dust. Light snow developed during the evening and continued through the early morning of the 4th. Snowfall totaled 2.7 inches.

In 1934…strong winds raked Boulder. A wind gust to 62 mph was recorded at Valmont just east of Boulder. The strong winds caused hundreds of dollars of damage in Boulder.

In 1981…the most vigorous snow storm of the season struck the state…closing many schools and most highways connecting Denver…Colorado Springs…and Limon. North winds gusting to 43 mph whipped nearly 10 inches of snow in Denver into 3-foot drifts and snarled traffic on the morning of the 4th. Snowfall totaled 9.8 inches at Stapleton International Airport.

In 1989…a storm dumped 2 to 6 inches of snow across metro Denver. The snow caused 2-hour air traffic delays at Stapleton International Airport where 3.0 inches of snow fell and north winds gusted to 23 mph on the 3rd. There were many traffic accidents across metro Denver. I-70 was closed east of Denver for a time on the 3rd.

In 1991…high winds raked the eastern foothills. Wind gusts of 60 to 90 mph were common with 119 mph recorded at Wondervu southwest of Boulder…106 mph on Shanahan ridge and 92 mph at Table Mesa…both in southwest Boulder. Several trees were uprooted and traffic signs and lights blown over. Flying debris caused damage to homes… Buildings…and cars. In Boulder…a stop sign was blown onto a car. There were no reports of injuries. Southwest winds gusting as high as 48 mph briefly reduced the prevailing visibility to as low as 1/16th mile in blowing dust at Stapleton International Airport on the 4th.


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.

» Click here to read the rest of March 1 to March 7: This week in Denver weather history

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February 2020 top shots: Monthly photo slideshow

Friday, February 28th, 2020 4:37pm MDT
An amazing sunset starts off February in style. (Renee Franz)

An amazing sunset starts off February in style. (Renee Franz)

February signifies the start of the climb toward warmer temperatures for the year.  Cold and snow though do intrude but, coupled with milder conditions, there are lots of photo opportunities as can be seen in our monthly slideshow.

The month is one of our least snowiest of the year but it isn’t unusual to see the landscape blanketed in white.  Warming temperatures through the month can bring the onset of spring fever and gives residents the opportunity to enjoy some prolonged time outdoors on the mild days.

Cold or mild, snowy or dry, our scenery is almost always gorgeous – and photo worthy.

  • Slideshow updated February 28, 2020
  • 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.

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.

So come on, get those camera’s rolling!

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