Thornton, Colorado, USA
UpdatedTue, 29-Nov-2022 1:20am MST 


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July 3 to July 9: This Week in Denver Weather History

Monday, July 4th, 2022 2:46pm MST

This Week in Denver Weather History

In our July weather preview we discussed how the month is not only Denver’s hottest but also its stormiest. Our look back at this week in Denver weather history helps to illustrate that fact. We start seeing 100+ degree days as well as many of the types of fast moving thunderstorm events expected this time of year.

From the National Weather Service:


In 2000…the 29th marked the beginning of a near record hot streak for metro Denver. The high temperatures…as recorded at Denver International Airport…exceeded the 90 degree mark for 17 consecutive days from June 29th through July 15th. The record of 24 consecutive 90 degree or above days was set from July 13th through August 5th…2008.


In 1874…a streak of 18 consecutive days of 90 degrees tied for second with another streak that was later set in the summer of 1901. The record of 24 consecutive days was established in the summer of 2008.


In 2012…it was the hottest July on record in Denver since weather records began in 1872. The average temperature for the month was 78.9 degrees which was 4.7 degrees above normal. There were 27 days in which the high temperature equaled or exceeded 90 degrees…which established a new record. There were also 7 days in which the temperature equaled or exceeded 100 degrees which tied the record set in 2005.


In 1874…the temperature climbed to a high of 101 degrees in downtown Denver.

In 1881…the all time highest recorded daily minimum temperature of 77 degrees occurred in the city. This was also the highest daily minimum temperature ever recorded in July.

In 1885…a severe thunderstorm produced hail the size of hazel nuts…which fell with great force. A telegraph pole in west Denver was struck by lightning and shattered to pieces.

In 1955…a brief microburst wind gust to 61 mph was recorded at Stapleton Airport.

In 1960…a major hail storm caused 1.5 million dollars in damage across metro Denver. The heaviest damage occurred in south Denver…Englewood…Littleton…and Golden from wind- driven hail as large as golf balls and heavy rain which caused flooding. Winds were estimated at 60 to 70 mph. Rainfall was estimated at 2 to 3 inches. Hail accumulated 3 to 4 inches deep in some sections. Hail carried by flood waters drifted 3 to 4 feet deep. An Englewood policeman was injured when hail broke the windshield of his car. One inch of rain in 10 minutes…and heavy hail damage were reported in Parker. At some places the hail from the storm was still on the ground the next morning.

In 1967…large hail stones from 1 3/4 to 2 1/2 inches in diameter damaged cars and buildings in southwest Denver and Littleton where hail drifted to depths of 3 to 4 feet. The hail caused a great deal of damage…and streets were flooded by heavy rain over many sections of west metro Denver. At centennial race track near Littleton…a few hail stones were as large as tennis balls. Large hail broke the windshield on a Littleton police car. Golf ball to tennis ball size hail fell in the vicinity of Arapahoe road and south Broadway. One inch diameter hail fell at the intersection of orchard and south university. Golf ball size hail fell in Broomfield. Hail in Westminster was measured from 1 to 1 1/4 inches in diameter. Tornadoes were sighted by the public near Cheery Creek Reservoir… north of Commerce City…and in Arvada…but caused no reportable damage.

In 1993…high winds developed behind a strong cold front along portions of the Front Range. While the strongest winds were reported north of metro Denver…the winds blew out a half inch thick pane of glass from a vacant 9-story building. The glass landed on a parked car below. West winds gusting to 52 mph kicked up some blowing dust at Stapleton International Airport.

In 1996…lightning sparked a small fire near buffalo creek in southern Jefferson County. Only one acre burned before the fire was contained.

In 2002…heavy thunderstorm rain washed out a frontage road 6 miles north of Larkspur. The nearby mountain ranch subdivision was also flooded. Heavy rainfall in the Hayman fire burn area washed out a secondary road when debris from the runoff blocked a culvert. Hail as large as 3/4 inch fell near Keenesburg…in Castle Rock…and 7 miles to the south of Castle Rock.

In 2005…severe thunderstorms produced high winds. Wind gusts to 75 mph were measured near Longmont and to 60 mph just west of Boulder. No damage was reported.

In 2007…severe thunderstorms produced large hail in the foothills and suburbs west of Denver. Large hail from 1 to 2 inches in diameter was reported in the vicinity of Idaho Springs…Rollins and Edgewater.

In 2009…severe thunderstorms produced large hail and north and east of Denver. Hail up to one inch in diameter was observed near Erie and firestone. Hail up to 1 3/4 inches was observed 5 to 6 miles west-southwest of Byers. The golfball size hail caused extensive damage to a wheat field. In Aurora…six children received minor injuries when lightning struck a nearby tree. The injuries occurred when they were knocked down by the blast. None of the children suffered burns or appeared to have been directly hit by lightning.

In 2014…a severe thunderstorm produced large… up to 1 ½ inches in diameter…about 14 miles northwest of Golden.


In 1874…the temperature reached a high of 102 degrees in downtown Denver. Large forest fires in the mountains from the west-northwest to the south filled the atmosphere over the city with dense smoke.

In 1885…a thunderstorm produced sustained winds to 44 mph with gusts to 60 mph. A circus tent was tattered by the strong winds.

In 1900…a thunderstorm produced northwest winds sustained to 42 mph with gusts to 51 mph…but only 0.05 inch of rain.

In 1903…the all time lowest temperature ever recorded in July…42 degrees…occurred. The temperature also occurred on July 31…1873.

In 1910…thunderstorm winds were sustained to 42 mph from the southwest.

In 1922…thunderstorm winds were sustained to 37 mph with gusts to 48 mph.

In 1956…a thunderstorm wind gust to 54 mph was recorded at Stapleton Airport.

In 1964…several men were knocked down by a bolt of lightning while playing golf in south metro Denver. They got up and ran for cover when one of them was struck by a second bolt. He suffered burns and shock.

In 1987…a weak tornado was observed for 6 minutes…7 miles northeast of Watkins. Hail 3/4 to 1 1/4 inches in diameter fell in southeast Aurora.

In 1988…lightning struck a group of people at the Jefferson County fairgrounds. A 42-year-old woman was seriously injured and was hospitalized for 3 days. Four other people sustained minor injuries.

In 1993…strong northwest winds uprooted several trees across metro Denver. Wind gusts to 64 mph were reported at Erie north of Denver. A west wind gust to 43 mph was recorded at Stapleton International Airport.

In 1995…lightning struck and injured two people standing in a field in Arvada.

In 1998…heavy thunderstorm rain…up to 2.75 inches…and marble size hail combined to flood local roads and fields near Roggen.

In 2002…heavy thunderstorm rain in the Hayman fire burn area caused flash flooding. In Jefferson County…Gulch Road was washed out. In Douglas County…high water washed out some forest access roads as well…generally to the east of a line extending from signal butte to Deckers.

In 2010…intense thunderstorms produced torrential rainfall… In excess of 5 inches in one hour…and caused flash flooding in the vicinity of Elizabeth. Numerous County roads were washed out. The combination of heavy rain and hail made it necessary to run snow plows through town. Extensive basement flooding was also reported. Severe thunderstorms produced large hail from Aurora south to Elizabeth and Larkspur. The hail size ranged from 1 to 2 inches in diameter. A wet microburst produced 1.84 inches of rainfall at Denver International Airport. A peak wind gust to 48 mph was also observed from the northeast.

In 2017…a microburst produced a wind gust to 61 mph…about 13 miles east-northeast of Denver International Airport.

In 2019…severe thunderstorms brought a wave of large hail across portions of Arapahoe…Broomfield…Denver…Douglas…Jefferson… and Weld counties. The hail ranged in size from 1 to 2 inches in diameter. The city of Lone Tree evacuated Sweetwater Park… where Fourth of July celebrations were underway…and Brighton delayed its Fourth of July concert. The Denver Outlaws game was postponed due to lightning. In Denver County…there was widespread damage from the hail…including damage to roof coverings and vehicles.


In 1875…nearly every railroad running into the city was damaged by heavy thunderstorm rains. The heavy rains washed out wooden bridges over normally dry creeks. Some trains were entirely suspended. In the city…heavy thunderstorm rain totaled 1.05 inches on the 4th…but only 0.28 inch on the 5th.


In 1989…one of the most intense heat waves on record roasted metro Denver. The temperature reached 100 degrees or more on 5 consecutive days. The city had previously never recorded more than 2 straight 100-degree days since records began in 1872. Water and electricity usage reached all time highs. The heat wave created extremely dry weather conditions…which contributed to a major forest fire in Boulder canyon on July 9th. The temperature reached 103 degrees on the 8th…and the mercury climbed to 101 degrees on both the 4th and 5th…and to 102 degrees on both the 6th and 7th. The low temperature of 68 degrees on the 8th equaled the record high minimum for the date.

5 » Click here to read the rest of July 3 to July 9: This Week in Denver Weather History

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June 2022 in Thornton saw average temps, drier than normal conditions

Monday, July 4th, 2022 8:44am MST
Thornton, Colorado June 2022 Temperature Summary. Click for larger view.

Thornton, Colorado June 2022 Temperature Summary. Click for larger view.

Last month was one of relatively little drama. Normally we expect June to bring plenty of severe weather but that just was not the case this year. That was, in part, due to a lack of moisture.

Thornton saw only 0.52 inches in the rain bucket, well-below average. While we did see some hot temperatures (two 98 degree readings being tops), overall the monthly average temp came in right near Thornton’s running 16 year average.

See the monthly climate summary for details.

Thornton, Colorado June 2022 Precipitation Summary. Click for larger view.

Thornton, Colorado June 2022 Precipitation Summary. Click for larger view.

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Thornton’s July 2022 preview: Summer heat really kicks in, thunderstorms common

Monday, July 4th, 2022 2:51am MST


Change is of course the one constant in Denver’s weather but come July, things actually get pretty consistent.

The standard formula for a day in July is a sunny morning, clouds developing in the late morning and early afternoon. Come mid-afternoon, thunderstorms are rolling off of the foothills and into the metro area and the eastern plains. These storms do occasionally reach severe status containing hail, gusty winds and heavy downpours of rain.

Check out our July weather preview for a complete look at what is in store for the month ahead.

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Video: Hikers capture massive rockslide in Rocky Mountain National Park

Friday, July 1st, 2022 2:50pm MST

“The large rockfall event happened on the south side of Hallett Peak at around 4:30 p.m. Tuesday that resulted in sliding rock falling into Upper Chaos Canyon. Park officials said the reason for the closure is that the area around the slide is highly unstable and there are forecasted rainstorms for the area until July 3, which could trigger more rockfall activity.” Get the full story here.

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Thornton’s Independence Day weekend to offer mild temps, some chances for storms

Friday, July 1st, 2022 5:00am MST

The four-day outlook starts off a bit cooler but then temps return to near normal and then leaning toward the hot side for the holiday.

For today, partly sunny skies will be above with highs in the low to mid-80s. The afternoon brings a chance for storms but most activity will again be to our south. Tonight, any storms will end by late evening then skies will clear. Lows will be around the 60 degree mark.

Saturday sees temps rebound with highs right around 90 degrees under mostly sunny skies. The afternoon brings a decent chance for storms. Saturday night, low dip to the low 60s under partly cloudy skies.

Sunday looks much like Saturday. Temperatures will again top out around 90 degrees. Mostly sunny skies will be above with a chance for PM storms. Sunday night, mostly clear skies will be above with lows in the low 60s.

For Independence Day, we will see plenty of sun and the mercury will climb. Look for highs pushing toward the mid-90s. The afternoon and evening will offer a slight chance for thunderstorms. Happy birthday, America!

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June 2022 top shots: Monthly photo slideshow

Thursday, June 30th, 2022 9:00am MST
A gorgeous double rainbow after a quick rain shower in Thornton. (Heidi Armstrong Khoury)

A gorgeous double rainbow after a quick rain shower in Thornton. (Heidi Armstrong Khoury)

The month of June typically sees springtime severe weather reach its height of activity in northeastern Colorado.

This affords the opportunity to capture extraordinary images of amazing weather phenomena from monstrous supercell thunderstorms to heavy rain, hail and even tornadoes.

  • Slideshow updated June 30, 2022

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.  June brings some very dynamic weather and the photos are a great way to see the stunning variety.

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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Thursday to cool down a bit, bring better chances for storms

Thursday, June 30th, 2022 5:04am MST

Last night we saw a little bit of excitement with some thunder, lightning and rain. Today, more moisture and cooler air arrives setting us up for even better chances for activity.

Partly sunny skies will be above this morning then cloud cover increases in the afternoon. High temperatures will top out in the mid-80s.

As for precipitation, late morning brings just a chance for a sprinkle. Then, as things heat up in the afternoon, chances will increase. Best opportunity comes from about 3:00pm to 6:00pm. Gusty winds will also be along. Tonight, a few lingering showers and thunderstorms will be possible.

Overnight lows will be in the upper 50s. Keep an eye out for the storms with our interactive radar here.

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Toasty temps for Thornton on Wednesday, just a slight chance for storms

Wednesday, June 29th, 2022 5:03am MST

Another hot one today set to bring mercury readings similar to yesterday. We will also see some gusty winds and some isolated thunderstorms.

The day starts off mostly clear. The afternoon will bring increasing cloud cover as moisture aloft increases. Look for breezy west winds this afternoon. High temperatures will top out in the mid-90s.

The afternoon will see some isolated thunderstorm activity move through into the evening. Unfortunately, at this time, we aren’t expect much activity and not much out of what does occur.

Tonight, any storms will end by about 9:00pm and we will then see some clearing. Overnight lows will be in the low to mid-60s.

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Tuesday sees a return of the heat to Thornton

Tuesday, June 28th, 2022 4:56am MST

We warned you it was coming and here you go. Today we see the mercury rebound with expected highs coming in well above normal.

Sunny skies start us off and will be with us most of the day. Only a few clouds are expected in the late afternoon and evening. As for temperatures, look for the mercury to climb to the mid to high 90s. Otherwise, conditions will be calm and dry.

Tonight, skies will be mostly clear with overnight lows in the low 60s.

Keep an eye on the thermometer with our live conditions here.

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Thornton’s workweek starts off with warmer temps, just a bit of a chance for a storm

Monday, June 27th, 2022 4:58am MST

The cooler weather we saw the last couple of days is not a memory and we begin to see summer heat stage a return. Today will see highs a bit below normal and a return to the 90s lies in wait.

Today starts off with some clouds then those will ease giving us mostly sunny skies for the majority of the daytime hours. High temperatures will top out in the mid-80s. Mid-afternoon into early evening have just a slight chance for some thunderstorm activity although at this time it isn’t likely we will get anything.

Tonight, skies will be clearing and conditions calm. Overnight lows will be in the mid-50s.

Looking at the balance of the workweek, highs in the 90s return Tuesday and Wednesday then we cool a bit to the mid-80s for Thursday and Friday. More in the extended forecast here.

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