Thornton, Colorado, USA
UpdatedThu, 20-Jan-2022 6:15am MST 


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October 3 to October 9: This week in Denver weather history

Tuesday, October 5th, 2021 4:59am MST

This Week in Denver Weather History

The first half of October historically is quiet for the most part but there have been years with plenty of excitement.  We have seen damaging tornadoes and winds and of course significant snowstorms.

From the National Weather Service:


In 1875…very dense haze hid the mountains from view as observed from the city.

In 1933…rainfall of just 0.01 inch was the only precipitation of the month.  This was the second driest October on record.

In 1954…the low temperature cooled to only 60 degrees…the all-time record high minimum for the month October.


In 1969…the first snowfall of the season totaled 16.0 inches at Stapleton International Airport.  There was a thunder snow shower on the evening of the 3rd…but otherwise little wind with the storm.  The greatest snow depth on the ground was 8 inches due to melting.  Heavy wet snow accumulated on trees…which were still in full leaf…and caused widespread damage from broken limbs and downed utility lines.


In 1984…the remnants of Pacific Hurricane Polo produced heavy rain over northeastern Colorado.  Most locations received between 1.00 to 2.50 inches of rain…but 3.45 inches fell in Littleton.  Rainfall totaled 1.73 inches at Stapleton International Airport…where north winds gusted to 24 mph.


In 1912…sustained south winds to 55 mph with gusts to 60 mph raised the temperature to a high of 83 degrees… The warmest temperature of the month that year.

In 1924…west winds were sustained to 46 mph with gusts to 50 mph in the city.  The apparent Bora winds cooled the temperature to a high of 57 degrees from a high of 70 degrees on the 3rd.

In 2004…several small tornadoes touched down near Brighton… Barr Lake…and Hudson in Adams and southern Weld counties. Most of these caused no damage.  However…a small tornado 5 miles southeast of Brighton caused extensive damage to a recreational vehicle and severely damaged a barn.  The barn was torn from its foundation…and the roof was thrown 100 feet.  Four llamas in the barn were injured when it collapsed.


In 1997…unusually warm weather resulted in two temperature records.  High temperature of 87 degrees on the 4th exceeded the old record set in 1922 by one degree.  High temperature of 86 degrees on the 5th equaled the record set in 1990 and previous years.


In 1962…unusually severe thunderstorms for this late in the season affected areas from Boulder northward.  Hail up to golf ball size and strong gusty winds did much damage to roofs…windows…and signs in Boulder.  Heavy rainfall caused local flooding.

In 1994…lightning caused a power outage to over 2400 homes for a few hours in and around Nederland in the foothills southwest of Boulder.  Very strong winds accompanied the thunderstorm.  Thunderstorm winds gusted to 60 mph and hail to 1/2 inch diameter fell in Lafayette.  Strong microburst winds gusting to 69 mph near Strasburg caused an oil rig to topple onto two vehicles…injuring one person.  The strong winds in the area also downed a few power poles… But caused power outages to only a few homes.

In 1995…strong winds spread from the foothills onto the plains.  Wind gusts to 77 mph were reported atop Squaw Mountain west of Denver.  On the plains…winds gusted to 60 mph at Kennesburg and to 62 mph near Strasburg. North winds gusted to 41 mph at Denver International Airport.

» Click here to read the rest of October 3 to October 9: This week in Denver weather history

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Tuesday in Thornton to continue beautiful, fall weather conditions

Tuesday, October 5th, 2021 4:54am MST

You could pretty much take a copy of yesterday’s forecast and post it in today’s. We will once again enjoy mild, calm conditions with lots of sun above.

Sunny skies start us off and will be with us through the morning. Mid to late afternoon may see a few clouds but nothing intrusive. Overall conditions will continue to be calm and dry. Highs today will once again top out near the 80-degree mark.

Tonight, mostly clear skies will be above with lows in the mid-40s.


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Mild temperatures, calm conditions kick of a pleasant fall workweek in Thornton

Monday, October 4th, 2021 4:58am MST

Other than a lack of moisture, there won’t be much to complain about weather-wise in the coming days. We will be enjoying mild temperatures and overall calm conditions.

For today, sunny skies will be above throughout the day. Conditions will be calm and dry. High temperatures today will top out close to the 80-degree mark, about 10 degrees above normal.

Tonight, lows will dip to the mid-40s under mostly clear skies.

For the balance of your workweek, look for similarly calm, mild conditions for the most part. Wednesday may see things mix up a bit with a chance for a shower. More in the extended weather forecast here.

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Thornton’s weekend to offer up pleasant, fall-like weather conditions

Friday, October 1st, 2021 4:58am MST

Hello, October! Mother Nature is welcoming the month with some good-looking weather. Temperatures will be close to normal with overall, calm conditions.

For Friday, we will still be seeing some cloud cover but there will be some spots of blue too. Highs will be in the upper 60s. This evening has just a slight chance to offer up a shower / thunderstorm. After that, skies will be partly cloudy with overnight lows in the mid to upper 40s.

Saturday will see fewer clouds and calm, dry conditions. Highs will top out near the 70-degree mark. Saturday night into Sunday morning, lows will dip to the mid-40s under mostly clear skies.

Sunday looks to be the warmest day of the period. Highs will be in the mid-70s under sunny skies.

Have a fantastic weekend!

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Thursday’s weather to be quite cool, see clearing skies

Thursday, September 30th, 2021 5:02am MST

Following yesterday’s cold front and the bit of rain it brought, today will dry out but cooler temperatures will remain. Highs today, in fact, will be some of the coolest we have seen since the end of May.

Cloudy skies start us off early. The cloud cover will slowly break up leading to partly sunny skies this afternoon. Overall conditions will be calm and dry. Highs will be topping out close to the 60-degree mark.

Tonight, overnight lows will dip to the low to mid-40s under partly cloudy skies.

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September 2021 top shots: Monthly photo slideshow

Wednesday, September 29th, 2021 7:18pm MST
The sun rises in the Colorado high country. (Ed Dalton)

The sun rises in the Colorado high country. (Ed Dalton)

The month of September is typically one of the more pleasant months in Colorado.  Temperatures are usually comfortable and there is not normally a lot of weather drama.  That however does not mean there aren’t plenty of photo opportunities.

Wildlife is still quite active along the Front Range and flowers will hold on to their petals for at least the first part of the month.  Then of course there is the weather which you never know what to expect.  Thunderstorms, heavy rain, and even snow are a possibility.

  • Slideshow updated September 29, 2021
  • 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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A taste of fall as Wednesday offers up cooler temperatures, chances for showers

Wednesday, September 29th, 2021 5:10am MST

Maybe, just maybe, we are finally done with the summer heat. A cold front will arrive today serving up much cooler temperatures and, with any luck, some much-needed precipitation.

Partly clear to mostly cloudy skies will be with us this morning with clouds increasing in the afternoon. The aforementioned cold front will push through this morning and with it, some breezy winds will be seen into the evening. Highs today will top out in the upper 60s, maybe hit the 70-degree mark.

Light sprinkles will be possible throughout the morning but aren’t expected to amount to much. Better chances for measurable precipitation come in the afternoon and particularly in the evening.

Tonight, we will have a decent chance for showers in the evening until about midnight. After that, only scattered activity is expected.  Overnight lows will dip to the mid-40s.

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Temperatures cool Tuesday but remain above normal, a bit of a chance for rain

Tuesday, September 28th, 2021 4:58am MST

We begin to see a change in the overall weather today as the first of a series of systems impacts us. Temperatures will cool some and we see a bit of a chance for precipitation.

The day starts off with a good bit of cloud cover and a light sprinkle of rain will be possible early. Then, partly sunny skies will be seen for the majority of the day. Highs today will top out in the low 80s. Mid-afternoon will offer up just a slight chance for a shower / thunderstorm.

This evening, we have a bit better chance for some precipitation and cloud cover will increase. Any showers should be done by about 9:00pm. We will then be left with partly clear skies as we head toward an overnight low is the low 50s. The pre-dawn hours tomorrow may bring a shower.

Looking ahead, temperatures will be cooling and chances for precipitation increasing through the end of the workweek. See the extended forecast for a look.

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Very warm temperatures, lots of sun start Thornton’s workweek

Monday, September 27th, 2021 4:57am MST

Heading back to work we are going to enjoy another day with temperatures well above normal. There is, however, cooler, more fall-like weather in the extended forecast.

For today, mostly sunny skies will be with us throughout the day. Overall conditions will be calm and dry. Highs today look to top out right near the 90 degree mark, well above the average high for the date of 74 degrees.

Tonight, skies will be partly clear with lows in the low to mid-50s.

Looking ahead at the rest of your workweek, low pressure begins to intrude tomorrow and with it, a series of disturbances and cold fronts. That will see things turn cooler and offer up some chances for much-needed precipitation. Check out the extended forecast for more details.

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September 26 to October 2: This week in Denver weather history

Sunday, September 26th, 2021 5:05am MST

This Week in Denver Weather History

Denver has been graced with an unusually mild September this year.  That however is not always the case and in fact the weather can be downright winterish as we see in our look back at this week in Denver weather history.


In 1908…apparent post-frontal rain changed to snow overnight and totaled 6.5 inches in downtown Denver.  This was the first snow of the season.  Precipitation totaled 0.76 inch. North winds were sustained to 39 mph on the 25th.


In 1996…an early season snowstorm brought heavy snow to the Front Range eastern foothills.  Snowfall totals included:  8 to 12 inches around conifer…7 inches on Floyd Hill…and 6 inches at both Bailey and Chief Hosa. Snowfall totaled only 4.7 inches at the site of the former Stapleton International Airport.  This was the first measurable snow of the season.  After the passage of a strong cold front…north winds gusted to 38 mph at Denver International Airport on the 25th.


In 1907…a late afternoon thunderstorm produced hail…0.23 inch of precipitation…and north winds sustained to 24 mph.

In 1927…snowfall of 1.7 inches…mixed at times with sleet… Was the first measurable snowfall of the season.

In 2012…a man was seriously injured when he was struck by lightning outside the Hebrew Educational Alliance as he and his family were getting in their car. The victim stopped breathing but was saved when his wife performed cardiopulmonary resuscitation on him immediately following the lightning strike. He suffered burns to 15 percent of his body which included his legs…chest… abdomen and neck. Lightning also caused 48 outages in Denver which affected 6582 Xcel Energy customers.


In 1936…the heaviest snowfall ever recorded in September and the heaviest snowfall ever recorded so early in the season dumped a total of 16.5 inches of snow on downtown Denver and 21.3 inches at Denver municipal airport.  The 15.0 inches of snow measured from 6:00 pm on the 27th to 6:00 pm on the 28th is the greatest 24 hour snowfall ever recorded in September.  This was the first snow of the season.  The snow was intermittent through the 26th…but continuous from early afternoon on the 27th to around midnight on the 28th…except for a period of rain during the afternoon of the 28th which contributed to a loss of depth on the ground.  The greatest snow depth on the ground downtown was 13 inches with 8 inches at Denver municipal airport.  There were no high winds with the storm and traffic was interrupted for only a short period.  The storm produced property damage estimated at 7 million dollars.  With trees and shrubs in full foliage…the leaves caught and held the heavy water-laden snow…until the branches snapped from the weight.  More than 3000 workmen were called to remove the debris and snow from the city.  The city firemen who were off duty…as well as all the reserves… Were asked to report to their stations.  All schools in the city remained open…but attendance was only 50 percent of normal.  Grade school students were sent home at noon on the 28th.  The early storm caught stockmen with many cattle still in higher ranges.  Warm weather followed the snow…which had all melted by the end of the month…except for a few inches in sheltered places.


In 1877…smoke from heavy forest fires in the mountains spread over the city on upper wind currents.

In 1935…the first snow of the season was 2.8 inches in downtown Denver.  The low temperature dipped to 31 degrees for the first freeze of the season.


In 1984…heavy snow fell over the plains and foothills. Snowfall amounts ranged from 2 to 5 inches on the plains with up to a foot at higher elevations in the foothills. The main problem caused by the storm was thousands of power outages caused by snow-laden tree limbs snapping and falling onto power lines.  Over 15 thousand homes lost power in metro Denver.  Some cars were damaged by falling trees and limbs.  The snow also caused some flight delays at Stapleton International Airport where 5.1 inches of snow fell and northeast winds gusted to 29 mph.  Maximum snow depth on the ground was 3 inches due to melting.  The high temperature of only 34 degrees on the 28th was a record low maximum for the date and equaled the all-time record for the month at that time.


In 1877…heavy dense smoke from mountain forest fires spread over the city.  The smoke was so dense that it obscured the sun at times.

In 1921…post-frontal northeast winds were sustained to 44 mph.

In 1953…a pacific cold front produced a west wind gust to 59 mph at Stapleton Airport where the visibility was briefly reduced to 3/4 miles in blowing dust.  Strong winds were also widespread over Boulder during the afternoon.

In 1960…strong…gusty winds tore the roof from 6 units of a motel on west Colfax Avenue in Denver.  The roofing sailed over the building and crashed down on a truck…wrecking it. The strong winds were the result of an apparent microburst.

In 1999…snow fell in the foothills west of metro Denver and over the plains.  Snowfall totals included 7 inches at conifer.  At the site of the former Stapleton International Airport…3.1 inches of snow were measured.  This was the first snow of the season.  The heavy wet snow snapped branches from fully leafed trees…downing power lines and causing scattered outages.

In 2004…severe thunderstorms produced hail to 3/4 inch in diameter in Littleton and in Douglas County 14 miles northwest of Castle Rock.

In 2012…a weak tornado (EF-0) tornado touched down near Strasburg. No damage was reported.

» Click here to read the rest of September 26 to October 2: This week in Denver weather history

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