Thornton, Colorado, USA
UpdatedSun, 17-Nov-2019 1:00pm MST 


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Temps a bit above normal, calm, dry conditions for Thornton’s Monday

Monday, August 12th, 2019 4:54am MST

We start off the workweek with a good looking day of weather. Temperatures will be near normal and we will have lots of sun and no storms.

Sunny skies will be with us throughout the daytime hours. Winds will be calm this morning then become a bit breezy out of the east in the afternoon. Highs today will top out around the 90 degree mark, a couple degrees above normal for the date.

Tonight, mostly clear skies will be above with lows dipping to about 60 degrees. Enjoy!

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Thornton’s weekend to feature seasonal temperatures, chances for storms each day

Friday, August 9th, 2019 5:34am MST

Pretty typical weather for us over the three day period. Temperatures will be at or close to normal and PM thunderstorms will be seen.

For today, mostly sunny skies will be above this morning then an increase in clouds in the afternoon. Some scattered thunderstorm activity will be seen with gusty winds, some brief rain being possible. Highs today will be in the low 90s. Tonight, storms will end not long after sunset and we will have mostly cloudy skies with lows in the mid-60s.

Saturday will see partly cloudy skies above throughout the day. Highs will be in the upper 80s. Thunderstorms are possible from about noon until sunset or so. Saturday night into Sunday morning, lows will be in the low 60s.

Sunday offers more of the same. Partly cloudy skies will be above and highs will again top out in the upper 80s. We will have our best chance of storms for the weekend that afternoon.

Have a great weekend

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Thornton’s Thursday to offer cooler temperatures, better chance for storms

Thursday, August 8th, 2019 5:37am MST

A bit of a break from the hot, dry pattern of recent days. Moisture is increasing and will be coupled with cooler air leading to lower temps and better chances for storms.

The day starts with partly clear skies and we will see much of the same for most of the day. High temperatures today should top out in the very comfortable low 80s range.

Thunderstorms will begin to develop around noon, if not a bit before, with our best chances for activity coming after 4:00pm until 8:00pm. Some of the storms will have the potential to deliver a heavy dose of rain and will bear close watch.

Tonight, any storms should end after midnight. Lows tonight will be near the 60 degree mark.

Keep an eye out for the storms here.

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Above normal temps, another chance for a thunderstorm Wednesday

Wednesday, August 7th, 2019 5:36am MST

More of the same would be a good way to sum up today’s weather. Unseasonably warm mercury readings will continue and we may see a PM storm.

The day starts out with mostly sunny skies and those will be with us into the afternoon. After that, as is normal, clouds will increase.

After about 3:00pm we will see some scattered thunderstorm development that may last into the evening.

Highs today will be in the mid-90s, about five degrees above normal for the date.

Tonight, any lingering storms will wind down leaving partly cloudy skies. Overnight lows will be in the low to mid-60s.

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Tuesday’s temperatures climb, only a slight chance for thunderstorms

Tuesday, August 6th, 2019 5:08am MST

Things dry out a bit today in the atmosphere and that is going to give us a lesser chance for storms. We will also see more sun helping to drive temperatures higher.

Mostly sunny skies start us off and will be with us until this afternoon. The later hours will see an increase in cloud cover. We see just a slight chance for thunderstorms after about 2:00pm and into the evening.

Highs today will be in the mid-90s.

Tonight, any storm activity should end by about 11:00pm and we will then have partly clear skies. Overnight lows will dip to the low 60s.

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

Monday, August 5th, 2019 5:31am MST
This week in Denver weather history

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

The beginning of August typically continues our monsoon season. This leads to increased chances for thunderstorms with heavy rain and the associated hazards that come with it. Our look back at this week in Denver weather history highlights the dangers of flooding, hail and lightning and even includes reference to grasshopper swarms being blown into the city.

From the National Weather Service:


In 1988…two inches of rain fell in 3 hours at both Morrison and Wheat Ridge. Thunderstorm rainfall totaled 0.80 inch overnight at Stapleton International Airport.


In 1889…southwest winds were sustained to 42 mph with an extreme velocity to 52 mph.

In 1924…0.01 inch of rain fell over downtown Denver. This along with the 0.01 inch of rainfall on the 10th was the only rainfall of the month…the driest August on record.

In 1963…heavy rains in the foothills above Idaho Springs caused mud and rock slides which closed U.S. Highways 6 and 40 for a time.

In 1976…hail to 1 inch diameter was reported 12 miles southwest of Denver. Hail to 3/4 inch in diameter was reported in Lakewood. Small hail…1/4 to 1/2 inch in diameter…fell at Stapleton International Airport.

In 1982…heavy rain poured through the roof of a clothing store in Aurora…causing widespread water damage. The roof was being repaired when the storm hit.

In 1983…hail up to one inch in diameter fell in Aurora where heavy rain produced street flooding.

In 1984…a Colorado state trooper was struck and injured by lightning in Northglenn.

In 1989…a microburst wind gust to 52 mph was recorded at Stapleton International Airport.

In 1997…lightning sparked a small fire in a home in Arvada… Causing minor damage. Several intersections in both Arvada and Westminster were flooded by thunderstorms producing heavy rain. Several cars were damaged by the high waters… And a number of businesses were flooded.

In 1999…flooding and flash flooding problems developed over metro Denver as slow moving thunderstorms dumped from 2 to 3.5 inches of rainfall in about 3 hours. Near the junction of I-25 and U.S. Highway 36…up to 4 feet of water flooded an auto dealership. About 45 cars were ruined. Damage estimates to the dealership alone totaled nearly a half million dollars. Sections of I-25 and U.S. 36 near the interchange were closed due to floodwaters. Floodwaters… Up to 5 feet deep…forced the evacuation of two mobile home parks in federal heights. Railroad tracks were washed out near Federal Blvd. and 64th avenue. Numerous power outages caused widespread blackouts in Thornton and Littleton. Along Massey Draw near Carr St. and Chatfield Reservoir…4 homes were flood damaged and portions of their backyards washed out. Widespread street flooding was also reported in Boulder where several buildings were flood damaged…including the University of Colorado Memorial Center.

In 2004…two golfers were shocked when lightning struck the eighth green of the golf course at Castle Pines north of Castle Rock. The two men suffered only minor injuries. Heavy thunderstorm rain from the same storm caused flash flooding. Floodwaters rushed across parts of U.S. Highway 85 near the entrance to the Castle Pines Golf Club. The traffic lanes were covered with up to 6 inches of running water.

In 2008…lightning sparked a grassfire that consumed 300 acres on the northern edge of Green Mountain…in Jefferson County. Gusty winds and very dry conditions allowed the wildfire to quickly spread and threaten several houses. Fortunately…only minor damage was reported to homes due to smoke and melted siding.


In 1881…the low temperature cooled to only 76 degrees…the record high minimum temperature for the month.

In 1889…southwest winds were sustained to 42 mph.

In 1918…hail pelted the city…but was light and caused no damage. Precipitation totaled 0.25 inch. Northwest winds were sustained to 31 mph.

In 1964…lightning struck two boys in Denver while playing ball. One was treated and released from the hospital…but the other boy suffered second degree electrical shock and cardiac arrest and was hospitalized in critical condition for several days.

In 1969…two tornadoes touched down briefly in an open field southeast of Buckley Field in Aurora. No damage was reported.

In 1970…heavy rain in the Indian Hills area in the foothills west of Denver caused flash flooding…which washed out roads and damaged other property. Hail accumulated to a 3 inch depth with stones up to golf ball size; however…most of the damage was from flooding.

In 1982…2.38 inches of rain fell in an hour in Arvada… Causing minor flooding on Ralston Creek. In Westminster… 1 1/2 inches of rain fell…causing damage to streets and culverts. In addition…lightning caused some minor power outages across metro Denver.

In 1983…very heavy thunderstorms hit the southern portion of metro Denver. Heavy rainfall…as much as 2.89 inches in 38 minutes…caused widespread street flooding in southeast Denver. Two feet of water covered a section of I-25. Hail up to golf ball size accompanied the storm in Littleton and Englewood…along with 60 mph winds.

In 1984…a heavy thunderstorm drenched Littleton with up to 2.35 inches of rain in an hour…along with small hail that piled up to 2 inches deep. Flood waters were up to 4 feet deep in parts of town with many basements flooded. There were some power outages caused by lightning.

In 1990…a thunderstorm dumped 1.25 inches of rain in 12 minutes near tower and smoky hill roads in southeast Aurora. Minor street flooding was reported in the area.

In 1992…a pilot reported two funnel clouds near Cheery Creek Reservoir. Both dissipated quickly. Dime size hail fell near Franktown.

In 1994…one inch diameter hail fell near Strasburg. No damage was reported.

In 1999…a dog kennel east of Denver International Airport… Was flooded when a small dam…upstream in Elbert County… Was breached. The floodwaters…up to 4 feet deep…washed away some 6-foot fences and other small buildings. Ten of the 70 dogs boarded at the kennel drowned.

In 2002…a mail carrier was struck by lightning as he inserted a key into a multi-unit mailbox in Bailey. The shock knocked the man back against the mail truck. He suffered minor injuries. Lightning struck a residence in Commerce City. The resulting fire destroyed the roof of a detached garage and damaged much of its contents. Hail as large as 1 3/4 inches in diameter pelted Pine. One inch diameter hail fell in Arvada and southwest Denver. Heavy rain triggered a mudslide along U.S. Highway 285 near Bailey. Both lanes of traffic had to be closed until debris could be removed from the highway. Several residences in the Bailey and Glenisle areas were also flooded.

In 2004…heavy thunderstorm rainfall caused localized flash flooding in Virginia Canyon near Idaho Springs. Sections of the Virginia Canyon Road had to be closed due to the floodwaters.

In 2008…a severe thunderstorm produced large hail…up to 1 1/4 inches in diameter…northeast of Parker. Several automobiles were damaged.

6 » Click here to read the rest of August 4 to August 10: This Week in Denver Weather History

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Thornton’s workweek starts with seasonal temps, chance for thunderstorms

Monday, August 5th, 2019 5:30am MST

A largely typical early August day ahead for us. Temperatures will be near normal and we expect the usual chance for PM storms.

Partly to mostly cloudy skies start us of, perhaps with a few sprinkles of rain but nothing that will amount to anything. The rest of the day should see a bit of sun with partly sunny skies.

The afternoon will see some scattered thunderstorm activity with the best opportunity coming from 2:00pm into the evening. Highs today will be right near the 90 degree mark.

Tonight, any lingering storms will end by midnight leaving partly clear skies. Overnight lows will be in the low 60s.

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July 2019 weather recap: Thornton comes in a bit hotter than normal with average precipitation

Saturday, August 3rd, 2019 3:31pm MST

Following a cool June, summer heated up in earnest in July. Temperatures warmed as they always do in July and were a bit warmer than normal and were coupled with typical PM thunderstorms.

The first eight days of the month saw a few warmer than normal readings but nothing too extraordinary. We did also enjoy three days with some nice, wetting thunderstorms.

After that, the heat kicked on and we registered nine straight days of 90+ degree readings from the 11th to the 18th. The last two days of the period also saw our first two 100+ degree days.

We then had a bit of a break from the heat for a few days before stringing together another nine 90+ degree readings.

Thornton’s overall average temperature for the month came in at 74.7 degrees. This was above the long term Denver average of 74.2 degrees for July. Out at DIA where Denver’s official measurements are taken, it was a good bit warmer with an average of 75.7 degrees.

Thornton’s highs ranged from a maximum of 101 degrees on the 19th down to a low of 54.5 degrees on the 9th. Denver also saw its maximum of 101 degrees on the same day and its coolest reading of 52 degrees on the 10th.

Denver tied record high temperatures on the 18th and 19th of 99 degrees and 101 degrees (set in 1998 and 2005 respectively).

In terms of precipitation, Thornton saw 2.18 inches fall in its bucket while Denver notched a bit more at 2.42 inches. The Denver average for July is 2.16 inches.

Click here to view Thornton’s July 2019 climate report.

Thornton, Colorado's July 2019 temperature summary.

Thornton, Colorado’s July 2019 temperature summary.

Thornton, Colorado's July 2019 precipitation summary.

Thornton, Colorado’s July 2019 precipitation summary.

724 AM MDT THU AUG 1 2019




                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
 HIGH             105   07/20/2005
 LOW               42   07/04/1903
HIGHEST           101   07/19
LOWEST             52   07/10

AVG. MAXIMUM     91.1              89.4     1.7     90.2
AVG. MINIMUM     60.4              58.9     1.5     60.3
MEAN             75.7              74.2     1.5     75.3
DAYS MAX >= 90     20              16.0     4.0       19
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.0     0.0        0
DAYS MIN <= 0       0               0.0     0.0        0

 MAXIMUM         6.41   1965
 MINIMUM         0.01   1901
TOTALS           2.42              2.16    0.26     1.03
DAILY AVG.       0.08              0.07    0.01     0.03
DAYS >= .01         9               8.3     0.7        8
DAYS >= .10         5               4.3     0.7        3
DAYS >= .50         2               1.4     0.6        0
DAYS >= 1.00        1               0.7     0.3        0
 24 HR. TOTAL    1.10   07/22 TO 07/22           07/23 TO 07/23

TOTALS 0.0               0.0

HEATING TOTAL       0                 6      -6        0
 SINCE 7/1          0                 6      -6        0
COOLING TOTAL     339               289      50      326
 SINCE 1/1        431               444     -13      615

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

AVERAGE WIND SPEED              9.7

AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR            5
NUMBER OF DAYS PC             24


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Thornton’s August 2019 preview: Temperatures begin to cool, fewer storms intrude

Saturday, August 3rd, 2019 2:42am MST

As summer vacations wind down and families prepare to send their kids back to school in August, Colorado weather also starts to settle down. The chances for severe weather decrease markedly during August and by the end of the month daytime temperatures are dropping quite a bit as well.

Find out more about what lies ahead with Thornton’s August weather here.

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July 2019 top shots: Monthly photo slideshow

Wednesday, July 31st, 2019 4:14am MST
After the Independence Day storms, a beautiful scene. (David Canfield)

After the Independence Day storms, a beautiful scene. (David Canfield)

Colorado offers outdoor opportunities unlike any other state and while the summer heat settles in, photos of the amazing scenes across our state provide a view into why we love it here so much.

The weather this time of year has a pretty standard pattern of quickly warming temperatures followed by afternoon thunderstorms that can cool things down.  These storms sometimes provide a good bit of ‘excitement’ and are a prime photo subject.

  • Slideshow updated July 31, 2019

Recreationalists head outdoors and take advantage of urban, suburban and rural opportunities.  As they do, our abundant wildlife that is found just about anywhere comes into focus.

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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