Thornton, Colorado, USA
UpdatedSun, 16-May-2021 2:35pm MDT 


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Somewhat unsettled weather for Thornton’s weekend

Friday, May 14th, 2021 4:55am MDT

A relatively typical bit of weather for this time of year over the next few days. Temperatures will be comfortable but we will have some good chances for showers and thunderstorms.

Friday will be the warmest day of the period with highs in the mid-70s. Mostly sunny skies will be above and then this afternoon some scattered thunderstorm activity is expected. Tonight, any storms will be done by midnight and we will have partly clear skies above. Overnight lows will be in the mid-40s.

Saturday sees an increase in cloud cover with partly sunny skies. High temperatures will be around the 70 degree mark. The afternoon and evening bring some showers. Saturday night, showers will be ending and lows will be in the upper 40s.

Sunday brings our best chance for precipitation, mainly in the afternoon. Highs will be in the mid to upper 70s with partly sunny skies.

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Beautiful weather conditions on tap for Thornton’s Thursday

Thursday, May 13th, 2021 4:51am MDT

A fine-looking spring day ahead for us, finally. We will enjoy a good dose of sun today with temps a bit above normal.

Mostly sunny skies will be above throughout the day. Overall conditions will be calm and dry other than some breezy winds in the afternoon. High temperatures will top out in the mid-70s.

Tonight, partly cloudy skies will be above and lows will drop to the mid-40s. Enjoy!

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May 2021 top shots: Monthly photo slideshow

Thursday, May 13th, 2021 4:24am MDT
Ominous skies and a bolt of lightning as storms roll through. (Jessica Fey)

Ominous skies and a bolt of lightning as storms roll through. (Jessica Fey)

Colorado’s famously highly variable weather seems to showcase itself during the month of May when a variety of weather conditions can be seen.  This provides a prime opportunity for photos of everything weather to flora to fauna.

The month of May can bring extremes.  Snow is not entirely uncommon during the month but more common is severe weather, particularly in the latter half of the month.  Thunderstorms become more frequent and their associated hazards – lightning, wind, hail and tornadoes – are usual visitors.  Providing additional subjects for pictures are the emerging spring flowers and our abundant wildlife.

  • Slideshow updated May 9, 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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Calm, cool, dry conditions for Thornton’s Wednesday

Wednesday, May 12th, 2021 4:58am MDT

After a couple of days of wet, chilly weather, we begin to turn the corner today. Temperatures will warm, although remain cooler than normal, but conditions will be calm and dry.

Partly sunny skies and some areas of fog start us off. Cloud cover will quickly ease leading to mostly sunny skies for most of the day. High temperatures will top out around the 60 degree mark, about 10 degrees below normal.

Tonight, skies remain mostly clear with overnight lows dropping to the upper 30s.

Warmer weather more on par with what we expect this time of year lies ahead. Have a look at the extended forecast here.

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May 9 to May 15: This week in Denver weather history

Wednesday, May 12th, 2021 4:46am MDT

This Week in Denver Weather History

As we get further into spring our look back at Denver weather history begins to show more typical severe weather.  This week in Denver weather history we see plenty of hail, heavy rainfall, a tornado or two and lightning that caused serious injuries.


In 1957…intense heavy rain caused flash flooding on toll gate creek in Aurora where 3 people were killed in a car. Up to 4 inches of rain fell in 5 hours in the Toll Gate Creek basin.  The rain also caused flash flooding on Sand Creek in Aurora and Denver.  Rainfall totaled 3.29 inches at Stapleton Airport with most of the rain…2.34 inches… Occurring on the 9th.


In 1979…4.3 inches of snow fell at Stapleton International Airport where northwest winds gusted to 30 mph on the 8th. Most of the snowfall…2.3 inches…occurred on the 9th. High temperature of only 35 degrees on the 9th equaled the record low maximum for the date.


In 1875…a heavy windstorm swept across the city for most of the day.  West-northwest winds averaged a sustained speed of 31 mph between 6:00 am and 3:00 pm.  The peak wind was sustained to 45 mph at 9:50 am.

In 1918…post-frontal winds were sustained to 40 mph with gusts as high as 43 mph.  Only a trace of rain fell.

In 1941…a tornado was noted at 2:20 pm to the northeast of downtown and was followed by another similar shaped cloud or dust roll estimated 3 miles behind.  Thick dust followed with heavy gusts of wind.  The temperature fell 15 degrees in 10 minutes following the twister.  The mild tornado did little damage except to unprotected frame structures.  Winds were sustained to 50 mph with the passing of the tornado at Stapleton Airport.  It was visible to observers for 10 minutes and was lost from sight as it traveled east into huge rolls of dust.  Hail and rain followed with a few hailstones as large as 1/2 inch in diameter downtown.  No damage was reported from the hail.  Thunderstorm winds sustained to 31 mph produced blowing dust downtown.  Precipitation was only 0.07 inch.

In 1983…streams swollen by recent rain and snowmelt caused an earthen dam to collapse…washing out portions of State Highway 67 near Deckers in southern Douglas County.

In 1992…three boys…ages 11…12…and 16…were struck by lightning while taking cover under a large tree during a thunderstorm in Jefferson County…just 7 miles northwest of Denver.  The three were seriously injured.


In 1889…heavy rainfall totaled 2.15 inches in downtown Denver.  The cold rain was mixed with snow at times overnight.  Temperatures on the 10th ranged from a high of 38 degrees to a low of 32 degrees with north winds sustained to 22 mph.

In 2003…a late spring snowstorm hammered the mountains… Eastern foothills…and urban corridor.  The heaviest snowfall occurred north of interstate 70.  The heavy wet snow caused damage to trees throughout metro Denver and downed power lines.  About 40 thousand people along the urban corridor were without power.  Storm total snowfall amounts included:  11.5 inches in Louisville… 8 inches in Boulder and Broomfield; 7 inches in Thornton…Broomfield…at Denver International Airport… And at the site of the former Stapleton International Airport; and 6 inches 4 miles east of Denver.  Snowfall ranged from 4 to 9 inches across extreme southern weld County.  In the foothills…15 inches of snow fell near Jamestown…9 inches at Rollinsville and Rawah…with 8 inches at Chief Hosa and atop Lookout Mountain. The snow was accompanied by thunder on the afternoon of the 9th at Denver International Airport where west winds gusted to 25 mph on the 9th and north winds gusted to 22 mph on the 10th.

In 2015…from the 9th to the 10th…a strong storm system brought heavy snow to areas in and around Denver. Moderate to heavy rain showers transitioned over to snow by early in the evening on the 9th. Heavy wet snow overnight caused many trees to break under the pressure of the sudden weight. Tree damage ranged from minor to significant…with old growth trees losing large limbs and new trees sustaining fatal damage. Power outages affected about 43350 Xcel Energy customers in metro Denver. The Intermountain Rural Electric Association also reported about 1000 power outages in the Strasburg areas. In the high country…CDOT shut down Interstate 70 between the Eisenhower Tunnel and Silverthorne due to multiple crashes.


In 1875…a windstorm sand-blasted the city from 10:00 am until midnight.  Northwest winds sustained to 60 mph brought clouds of sand…which caused high damage to unfinished buildings.

In 1912…a vigorous cold front produced strong north winds and rain.  North winds were sustained to 48 mph with gusts as high as 60 mph.  Rainfall totaled 1.10 inch.

In 1935…no precipitation occurred…making this one of only two days without precipitation during the entire month.  The other day was the 21st.  Precipitation totaled 4.95 inches for the month.

In 1956…northwest winds gusted to 53 mph at Stapleton Airport where the visibility was briefly reduced to 1/2 mile in blowing dust.

In 1974…strong winds caused 30 thousand dollars in damage to a building under construction in Lakewood.  Microburst winds gusted to 46 mph at Stapleton International Airport.

In 1988…lightning struck a house in Boulder…setting it afire.  The house…valued at 170 thousand dollars…was a total loss.

In 1989…golf ball size hail fell over southeast Denver near the junction of I-25 and I-225.  Hail to 3/4 inch in diameter fell over southeast Aurora.  Only 3/8 inch hail fell at Stapleton International Airport.

In 1991…high winds up to 63 mph raked the eastern foothills. Winds estimated to 50 mph tore a roof from a home in Lafayette.  A tower at Jefferson County stadium in west metro Denver was blown over by the high winds.  No injuries were reported.  Southeast winds gusting to 48 mph at Stapleton International Airport produced some blowing dust.  The temperature climbed to a high of 86 degrees… Equaling the record maximum for the date.

In 2005…severe thunderstorms produced hail as large as 2 inches in diameter in and near Longmont.


In 1918…post-frontal snowfall totaled 4.7 inches in downtown Denver.  Northwest winds gusted to 19 mph on the 10th.

In 1923…winds were strong and gusty on both days.  Northwest winds were sustained to 40 mph with gusts to 44 mph on the 10th.  North winds were sustained to 39 mph with gusts to 46 mph behind an apparent cold front on the 11th.


In 2011…from the 10th to the 12th…a spring snowstorm brought heavy snow to the Front Range Foothills and Palmer Divide. Storm totals included: 18 inches…4 miles south-southeast of Pinecliffe; 16 inches in Coal Creek Canyon; 15 inches…4 miles west-southwest of Eldorado Springs; 13 inches at Gold Hill…12 inches…4 miles west-southwest of Conifer and 4 miles northwest of Elizabeth; 11.5 inches…6 miles southwest of Evergreen and 4 miles east-northeast of Nederland; 11 inches…3 miles east of Jamestown and 10.5 inches…3 miles east of Franktown and 3 miles south of Golden and 10 inches…10 miles north of Elizabeth. At Denver International Airport… 1 inch of snowfall was observed.

» Click here to read the rest of May 9 to May 15: This week in Denver weather history

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Chilly temperatures, rain showers follow Thornton’s stronger-than-expected snow

Tuesday, May 11th, 2021 5:08am MDT

Well, okay, then. Mother Nature threw a bit of a curveball delivering more snow than expected as we received 2.9 inches as of 4:00am. The snow won’t be lasting long but today will remain chilly and wet.

Cloudy skies start us off and will be above throughout the day. There might be a few periods of lighter coverage but don’t expect to see much blue today.

A rain / snow mix will be possible until about 9:00am when showers will turn to all rain. The afternoon may see these increase a bit but we aren’t expecting anything extraordinary.

High temperatures will top out in the low to mid-40s.

Tonight, showers will taper off, ending by midnight. Skies will then clear some but fog can be expected in the early morning hours tomorrow. Overnight lows will again be near the freezing mark.

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Monday to offer cool temps and rain, snow possible overnight

Monday, May 10th, 2021 5:05am MDT

A relatively potent system moves through northern Colorado today. For us, that will mean a chilly, damp day and yes, the dreaded “s-word” (snow) may rear its head tonight.

Cloudy skies will be the rule throughout the day today. Temperatures will remain cool with highs only reaching the mid-40s. A few light sprinkles of rain may be seen this morning. This afternoon, shower coverage will become widespread and we should receive a nice dousing. Some thunder might be mixed in this afternoon.

Tonight, we will remain cloudy with overnight lows dropping to the mid-30s. Rain showers will continue and after midnight, precipitation will have the potential to turn to snow.

We may very well see an inch or so on grassy surfaces by tomorrow morning although best chances for the white stuff will be to our west and south. If you have recently planted or have sensitive vegetation, it might not be a bad idea to get it covered up.

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Thornton’s weekend starts quite warm, will end much cooler and wetter

Friday, May 7th, 2021 5:07am MDT

In a lot of ways, this weekend looks much like the previous one. Things will be starting out pleasant and mild but by the end it will be a good bit cooler and wetter.

For Friday, sunny skies start us off then a few clouds arrive in the afternoon. The afternoon brings some breezy winds and just a bit of a chance for a shower. Tonight, skies will be partly clear with lows in the upper 40s.

Saturday brings the first of a series of a fronts and that will bring chances. Partly sunny skies will be above and then the afternoon will see winds pick up and offer decent chances for thunderstorms and showers. Saturday night, some light showers will be possible with overnight lows around 40 degrees.

Mother’s Day continues the downward trend as another front reinforces the first. Mostly cloudy skies will be above and highs will only be in the mid-50s. Some light rain showers will be possible throughout the day, increasing in coverage and intensity Sunday evening.

Now, just want to throw this out there…  Monday and Tuesday are going to continue the unsettled weather. Most notably, we do see a chance for snow Monday night into Tuesday morning. It won’t amount to much but it is definitely a possibility.

Gotta love springtime in Colorado, eh? Have a great weekend!

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Pleasant spring weather conditions for Thornton’s Thursday

Thursday, May 6th, 2021 4:58am MDT

A break from the unsettled, cool conditions of recent days. Today sees one of those spring days we all love with lots of sun and mild temperatures.

Sunny skies start us off and will be with us throughout the daytime hours. Overall conditions will be calm and dry. High temperatures will be topping out in the low to mid-70s.

Tonight, temperatures will drop to the mid-40s under mostly clear skies. Enjoy!

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Wednesday brings another cool day, another chance for showers

Wednesday, May 5th, 2021 5:04am MDT

Today’s weather looks to be a good bit like we experienced yesterday. We will see some sun, temps will be on the cool side and the afternoon brings a chance for showers.

Partly sunny skies start us off in the morning and we will similar sky conditions for the majority of the day. A few sprinkles of rain may be seen by late morning then early afternoon brings some scattered thunderstorm activity. Any cells that move through should be relatively benign as there isn’t much instability to aid in their development. High temperatures will top out in the low 60s.

Tonight, skies will be clearing and overnight lows will drop to the upper 30s.

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