Thornton, Colorado, USA
UpdatedTue, 29-Nov-2022 12:30am MST 


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Thornton’s shortened workweek to continue with the heat

Tuesday, September 6th, 2022 5:02am MST

Don’t put away those air conditioners for the season just yet. We are set to  continue our string of hot temperatures today and for a couple of days beyond.

Today, the sky starts off sunny and we will stay quite clear much of the day. The afternoon may bring just a few clouds. Overall, conditions will be calm and dry.

High temperatures will be topping out in the upper 90s. Denver’s record high for the date is 97 degrees and it would not be surprising to see us match or beat it.

Tonight, skies will be mostly clear, conditions calm. Overnight lows will be in the mid-60s.

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September 4 to September 10: This Week in Denver Weather History

Sunday, September 4th, 2022 6:45am MST

This Week in Denver Weather History

The first full week of September sees us start one of the most pleasant times of year in Denver. While less common this time year, severe weather can and does occur. Our look back at this week in Denver weather history includes hail, damaging wind and even smoke from wildfires hundreds of miles away.

From the National Weather Service


In 1995…record breaking heat occurred on the first 5 days of the month when the temperature climbed into the 90’s on each day. Record high temperatures of 97 degrees on both the 1st and 4th equaled the all-time record maximum for the month. High temperature of 95 degrees on the 3rd was a record for the date. High temperatures of 94 degrees on both the 2nd and the 5th were not records. The low temperature of 64 degrees on the 4th equaled the record high minimum for the date.


In 1978…the temperature reached 90 degrees or more on seven consecutive days with the highest temperature…94 degrees… Recorded on both the 4th and 6th.


In 2020…a worsening drought that started in the spring and continued through September. Outside of an early season snow on the 8th…the month of September was another unseasonably warm and dry period. The combination of hot…mostly dry conditions…and critically dry fuels… resulted in a continuation and rapid expansion of several massive wildfires. The Cameron Peak fire…which became the largest in the state`s history started on August 13th…and continued through September. As a result…very poor air quality continued to impact Denver and the entire Front Range. Denver recorded the most days ever with a high temperature of 90 degrees or better; 75 days. The last of which was 91 degrees on the 24th. The previous record was 73 days set in 2012.


In 1909…rainfall for the 4 days accumulated to 3.97 inches in Boulder…while in Denver rainfall totaled 2.45 inches on the 4th…5th…and 6th.


In 1909…apparent post-frontal heavy rainfall totaled 1.94 inches in downtown Denver. North winds were sustained to 19 mph.

In 1944…a trace of rain fell. This together with a trace of rain on the 9th…10th…and 30th was the only precipitation for the month. The total of a trace of precipitation for the month equaled the driest September on record first set in 1892.

In 1960…the highest recorded temperature in September…97 degrees…occurred. The same temperature also occurred on September 5…1899…September 1…1995…and September 4… 1995.

In 1989…a strong thunderstorm wind gust flipped a plane taxiing on a private runway in Adams County east of Denver. Two people were slightly injured and the plane was heavily damaged.

In 1992…strong winds developed across metro Denver behind a pacific cold front. Sustained winds above 40 mph with gusts as high as 60 mph were recorded mainly in and near the foothills. Pre-frontal south winds gusted to 37 mph at Stapleton International Airport.

In 1995…two people were injured when lightning struck their home in Lakewood. The lightning entered the attic where it started a small fire. It then traveled through the walls… Exploding a mirror and spraying glass on the residents. Lightning also sparked small grass fires near Aurora…Denver International Airport…and Bennett. The highest recorded temperature in September…97 degrees…occurred. The same temperature also occurred on September 5…1899…September 4…1960…and September 1…1995.

In 2000…thunderstorm winds gusted to 64 mph in Castle Rock.


In 1899…the highest recorded temperature in September…97 degrees…occurred. The same temperature was also reached on September 4…1960…and September 1 and 4…1995.

In 1940…a severe wind and hail storm confined mostly to the west and north parts of the city occurred shortly after 4:30 pm. Hail stones ranged in size from 1/4 to 1/2 inch in diameter. In north Denver…hail piled to a depth of 4 inches. Flooding occurred in one underpass…which stalled 2 cars. One girl was injured when the weight of the hail flattened a porch on which she stood. Northeast winds were sustained to 29 mph with gusts to 32 mph in downtown Denver.

In 1987…a thunderstorm complex produced hail as large as 1 3/8 inches in diameter…2 miles east of Buckley Field in Aurora. No damage was reported.


In 2020…a strong upper level low brought an end to record heat to the Front Range urban corridor…and provided Denver its second earliest measurable snowfall on record. Numerous heat records were set leading up to the snowfall…and several new snowfall and cold records were also broken in this abrupt bout with winter. Denver set its all time record high for September…reaching 101 degrees during the afternoon. This was also the latest date a 100 degree reading has ever been observed in Denver. Another daily record high was then tied on September 6th when Denver hit 97 degrees. September 7th was the last day of heat when Denver`s high temperature reached 93 degrees. That tied Denver for the record for the number of 90 degree days for a year at 73…and was also the warmest temperature ever recorded before a day of measurable snowfall. By the evening of September 7th…a series of cold fronts progressed southward from Wyoming into Colorado… dropping the temperature into the low 30s by the early morning hours of September 8th. Snow developed across the Front Range mountains and foothills overnight… while a mix of rain and snow developed along the I-25 corridor. A few locations picked up light snowfall accumulations in the morning. Accumulating snow was mostly confined to the higher elevations much of the day…before spreading across the plains during the late afternoon and evening. Storm totals ranged from 4 to 10 inches in the mountains…with 3 to 6 inches near the foothills. A total of 5.6 inches of snow was measured at the NWS Boulder office…while at Denver International Airport…the official measurement was 1.0 inch.


In 1988…layers of smoke aloft from large forest fires in Yellowstone National Park completely obliterated the sun at times. At Stapleton International Airport…surface visibility was reduced at times to 5 and 6 miles in smoke. » Click here to read the rest of September 4 to September 10: This Week in Denver Weather History

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August 2022 weather recap: A very warm month, precip ends close to normal

Saturday, September 3rd, 2022 6:25am MST

Thornton, Colorado August 2022 Temperature Summary. (ThorntonWeather.com)

Looking back on August 2022, by far the most notable weather feature was the temperatures. They were stubbornly warm, refusing to show the usual decrease toward the end of the month we expect to see.

Thornton’s overall average temperature for the month came in at 73.7 degrees. This was well above our 16-year running average for August of 71.6 degrees. This put it in the books as Thornton’s fourth warmest August out of the past 16.

Denver was considerably warmer with an average temperature of 76.1 degrees for the month. This was well above the Mile High City’s historical average of 72.9 degrees (1991 – 2020).  August 2022 goes into the books as the fourth warmest August on record in Denver.

Precipitation was fleeting and came in spurts during the month but Thornton’s rain bucket tallied near normal precipitation. We recorded 1.43 inches, a bit above the 1.23 inches average for August over the past 16 years. More than half of that fell on the 15th and 16th of the month.

Denver pretty much matched our total with 1.45 inches of rain. That was slightly less than the historical August average for the Mile High City of 1.58 inches.

Click here to view Thornton’s complete August 2022 climate summary report.

Thornton, Colorado August 2022 Precipitation Summary. (ThorntonWeather.com)

Thornton, Colorado August 2022 Precipitation Summary. (ThorntonWeather.com)

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Thornton’s September 2022 preview: One of our more pleasant, calm months usually

Friday, September 2nd, 2022 6:16am MST

Following an August that was unseasonably warm and dry, we find ourselves heading into September hoping for relief.  The month can bring plenty of rain and even our first snow of the season but more often than not, it is one of the most pleasant along the Colorado Front Range.

As temperatures start to drop, September usually reminds us that summer is at an end and fall is now here. Sunshine is predominant though as the month actually has the highest percentage of sun out of any month. Sunny days and clear, cool nights are the standard weather pattern for the month.

The month can bring extremes however.  We will of course forever remember 2013’s devastating floods brought on by record-setting rain.  Longtime residents might remember September 1971 which brought over 17 inches of snowfall.

Get a complete look at September’s weather and more details as to what we can expect this year here.

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Labor Day weekend in Thornton to bring on the heat and keep it cranked up

Friday, September 2nd, 2022 5:18am MST

Labor Day is oftentimes viewed as the unofficial end of summer. This year, Mother Nature is apparently in no rush for the changing of the seasons.

For Friday, we continue with conditions like we have seen in recent days. There will be lots of sun and only the slightest chance for a thunderstorm in the afternoon and evening. Highs will top out in the low 90s.

The balance of the holiday weekend keeps the temps above normal and offers up dry conditions.

Look for highs on Saturday around the 90 degree mark. Things then warm up further on Sunday with highs in the low to mid-90s. Labor Day will be the warmest day of the period with highs in the mid-90s.

Enjoy the long weekend and stay cool!

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Thursday to begin a stretch of very warm, dry days for Thornton

Thursday, September 1st, 2022 5:51am MST

You will pretty much be able to copy and past this weather forecast for today on every day for the foreseeable future. A high pressure ridge will establish itself and keep things stubbornly warm and dry.

Sunny skies start us off today and will be with us most of the day. A few clouds may arrive in the late afternoon but they won’t be much. High temperatures will be climbing to the low to mid-90s. Conditions will be dry.

Tonight, skies will be mostly clear and overnight lows will be around the 60 degree mark.

Looking ahead, you can expect MOTS (More Of The Same) through the weekend.

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August 2022 top shots: Monthly photo slideshow

Wednesday, August 31st, 2022 5:45am MST
The Mile High City on a gorgeous summer day. (Diana Mauzy)

The Mile High City on a gorgeous summer day. (Diana Mauzy)

As the calendar turns to August, the summertime heat begins to fade and that makes it easier to get out and enjoy all of the outdoor activities Colorado has to offer.  From a walk in a park to afternoon thunderstorms to an abundance of wildlife, photo opportunities abound as is seen in our slideshow.

Our monsoon season typically arrives about now and that means better chances for moisture.  However with limited instability, the intensity of storms are more sedate.  That doesn’t mean however that the weather is any less photographic.

  • Slideshow updated August 31, 2022

By the end of the month some of our seasonal feathered friends will be looking to leave the state giving our last chance to see them till spring.  Larger mammals are gearing up for the rut (mating season) and that can make for some intense scenes.

Showcasing images captured by ThorntonWeather.com readers as well as some of our own, our monthly slideshow covers the entire gamut of weather and nature related imagery. Sunsets, sunrises, wildlife and of course every type of weather condition are vividly depicted.

To learn more about how to send your photo to us for inclusion in the slideshow, see below the slideshow.

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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Wednesday in Thornton continues the heat, offers a slight chance for a storm

Wednesday, August 31st, 2022 5:09am MST

Not much change in our weather for today versus previous days. Temps will remain warmer than average but we do see just a bit of a chance for a thunderstorm this afternoon.

With increased moisture aloft, we will see a little bit of cloud cover today. Generally, look for mostly sunny skies. The afternoon and evening bring a slight chance for a thunderstorm although most activity will likely be west of us. High temperatures will once again top out around the 90 degree mark.

Tonight, early evening will see an end to any thunderstorm activity. Skies will then clear and overnight lows dip to the upper 50s.

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August 28 to September 3: This Week in Denver Weather History

Wednesday, August 31st, 2022 4:58am MST

This Week in Denver Weather History

So who is ready for some snow? Along with many other notable weather events, it was this week in Denver history when we received our earliest snowfall on record!

From the National Weather Service:


In 1875…grasshoppers appeared in great numbers at 10:00 am on the 19th. Thousands landed on the ground. The streets were literally covered with them. Swarms of grasshoppers were seen on each day. All gardens in the city were devastated…and in the countryside the grasshoppers were very destructive to ripened grain. On the 30th the grasshoppers were so numerous as to almost darken the sun.


In 2004…a brief chilly spell resulted in three temperature records. The high temperature of 55 degrees on the 27th was a record low maximum for the date. The low temperature of 48 degrees on the 27th equaled the record minimum for the date. The low temperature of 42 degrees on the 28th was a record minimum for the date.


In 1887…a dry thunderstorm produced north winds to 48 mph but only a trace of rainfall.

In 1968…one man was seriously injured by lightning while riding on a roller coaster at a Denver amusement park. An airline employee was injured when lightning struck a jetliner he was servicing at Stapleton International Airport. A lightning-caused fire did extensive damage to one house and minor damage to several others in the city of Denver.

In 1970…a microburst wind gust to 53 mph was recorded at Stapleton International Airport.

In 2002…a severe thunderstorm produced 3/4 inch diameter hail near Parker.

In 2005…lightning sparked a small fire near Jamestown. The blaze was quickly contained and consumed less than an acre.


In 1876…after the passage of a gentle rain shower to the east during the late evening hours…the moon shone brightly and a remarkably bright lunar rainbow appeared.

In 1910…an apparent cold front produced sustained northeast winds to 40 mph.

In 1946…the high temperature warmed to only 55 degrees…the record low maximum for the month.

In 1989…a spectacular lightning display knocked out power to 300 blocks in southeast Denver. One bolt started a fire in a lumber yard in the northeast part of the city…and the attic of a home in the same area was set ablaze by a lightning bolt.

In 1996…3/4 inch diameter hail was measured in Parker.

In 2000…lightning struck two homes in Thornton. The extent of damage was unknown.

In 2002…two small tornadoes caused damage in southeast metro Denver. The first tornado…associated with a multi-vortex storm…touched down briefly near E-470 and South Jordan Road. Some fences were damaged…and a few trees were blown down. A few of the homes also sustained minor roof damage. Damage from this storm totaled 100 thousand dollars. The second tornado associated with the storm touched down in a subdivision that was under construction at Gartrell and Arapahoe roads. Four large condominiums under construction were destroyed. The most heavily damaged portions of the structures were still in the framing stages. Adjacent sections where enclosed walls were in place were not destroyed. A man suffered 4 broken ribs and several cuts and bruises when the trailer he sought shelter in was flipped three times and torn apart by the twister. Damage from this storm totaled 6 million dollars. A severe thunderstorm produced 1 inch diameter hail near Evergreen.

In 2006…severe thunderstorms produced large hail in the foothills west of Denver. Hail to 1 inch in diameter fell near Blackhawk. Hail as large as 7/8 inch was measured near Idaho Springs…along with 3/4 inch hail near Nederland and conifer.


In 1981…60 mph winds were reported in Boulder.

In 2004…a severe thunderstorm produced hail as large as 1 inch in diameter in south Aurora near Cherry Creek.

In 2016…an intense thunderstorm produced very heavy rain and hail in Westminster…where radar estimated up to 3.6 inches of rainfall. Several vehicles were stranded in 2 to 3 feet of moving water at the intersection of 72nd Ave. and Pecos St. Street flooding was also reported on U.S. 36 at Pecos St.


In 1951…hail as large as 1 3/4 inches in diameter caused an estimated 300 thousand dollars damage in metro Denver. Hail as large as 1 1/2 inches in diameter was measured at Stapleton Airport.

In 1978…strong thunderstorm winds tore the roof off an apartment building in Aurora…downed trees…and damaged windows in Denver. A microburst wind gust to 58 mph was recorded at Stapleton International Airport.

In 1985…a thunderstorm wind gust to 60 mph was clocked at Buckley Field in Aurora.

In 1997…hail to 1 1/4 inches in diameter was measured in Aurora.

In 2006…a female postal worker was struck and injured by lightning while delivering mail in Westminster.

In 2008…lightning struck a home in Brighton…damaging the roof and a bedroom. The damaged totaled 20 thousand dollars.

In 2020…a worsening drought that started in the spring of 2020…continued through August. The month of August tied with 2011 for the warmest August on record. It also occurred in the middle of the second warmest summer on record. The combination of hot and dry conditions…in addition to critically dry fuels from years of beetle kill…resulted massive wildfires. The Cameron Peak fire…which became the largest wildfire in the state`s history started on August 13th and continued to burn into October. Smoke from this wildfire in addition to several other large wildfires in Colorado and the West resulted in multiple days of extremely poor air quality. In addition…the air quality in Denver and the entire Front Range had deteriorated severely due to the very warm temperatures and high ozone content… which had spiked significantly. In August…26 days in the month equaled or exceeded 90 degrees. » Click here to read the rest of August 28 to September 3: This Week in Denver Weather History

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Temperatures return to the 90s Tuesday, lots of sun, dry conditions

Tuesday, August 30th, 2022 4:59am MST

After a one-day break, we rebound back into the 90s today. Conditions will be calm and dry with lots of sun above.

Sunny skies will be the rule throughout the daytime hours. High temperatures look to top out in the low 90s. Overall, conditions will be calm and dry.

Tonight, we will see a few clouds in the evening then mostly clear skies for the balance of the overnight hours. Look for lows to dip to near 60 degrees.

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