Thornton, Colorado, USA
UpdatedFri, 24-Mar-2017 9:55am MDT 


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Much colder temperatures, snow, arrive for Thornton’s weekend

Friday, December 16th, 2016 5:02am MDT

Following what was a very mild day yesterday, significant changes arrive today that will affect the entire weekend. The mercury will be dropping today to be followed by snow overnight and then bone-chilling cold Saturday. While Sunday will warm back up, it will remain quite cold.

For Friday we saw our high temperature of the day soon after midnight and it is going to be pretty much all downhill from there. Temperatures in the 30s early will be giving way to readings in the 20s by late afternoon as cold air pushes through. Skies above will be mostly cloudy.

We may see a flurry or two by mid to late afternoon today but most of the snow will hold off until after midnight and fall between then and dawn on Saturday. An inch or two of the white stuff will be possible. Overnight tonight the temperatures will plunge to lows right at, possibly a bit below, zero.

Saturday morning brings a few lingering flakes of snow but then clearing will occur quite quickly by mid to late morning. Despite the sun, it is going to remain very cold with high temperatures tomorrow only in the single digits. Saturday night into Sunday morning the clear skies are going to help facilitate bone-chilling low temperatures below zero.

Sunday will offer a warmer day but mercury readings will remain well below normal. Look for sunny skies and highs coming close to the freezing mark. Have a great weekend and stay warm and safe! For all the latest, head over to our Winter Weather Briefing Page.

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Thursday to bring Thornton’s warmest temperatures of the week

Thursday, December 15th, 2016 5:13am MDT

A brief respite from the cold for us today and tomorrow as we enjoy above normal high temperatures. It will be short-lived as our next system arrives late Friday ushering in our next blast of cold air.

For today look for partly sunny skies to kick things off and similar sky conditions to remain through the day. Winds will be out of the southwest, possibly becoming a bit breezy this afternoon. Temperatures will be climbing toward a high right near the 50 degree mark, a good bit above the average for the date of 42 degrees.

Looking ahead, tomorrow will be somewhat similar to do but then a cold front moves in during the evening and overnight hours. This is going to send the mercury plunging, possibly to below zero Friday night / Saturday morning. Saturday highs will only be in the single digits. We do have a chance for some light snow accumulations Saturday night into Saturday morning.

Until the cold arrives, enjoy the relative warmth.

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Weather Geek Stuff is your one-stop-shop for the weather enthusiast on your gift list

Thursday, December 15th, 2016 3:02am MDT

Weather Geek Stuff is a great place to shop for gifts for weather enthusiasts, weather geeks and weather lovers.

Not everyone gets excited about blizzards, tornadoes, hurricanes and other types of extreme weather but many folks out there are passionate about Mother Nature.  Weather enthusiasts are certainly a different breed and they would welcome a gift that shows their enthusiasm for everything the weather offers.  Weather Geek Stuff is an online shop just for those whose hearts race with the thrill of severe weather.

Weather Geek Stuff is an online store that provides a host of clothing items and novelties just for weather buffs.  From the store’s custom ‘Weather Geek’ and ‘Weather Diva’ logoed merchandise to items imprinted with amusing weather warnings signs as well as Skywarn storm spotter logos, there is something there sure to please any weather lover.

Weather Geek Stuff’s merchandise was shown on the Weather Channel as a recommended gift so you know the quality is good.  Stu Ostro, Weather Channel’s Senior Director of Weather Communications even sports a ‘Weather Geek’ t-shirt on his Twitter profile.

Kids and dogs aren’t left out of the weather fun either.  There is a wide variety of clothing items sized just right for the little ones from babies to bigger kids.  Canine companions as well can get shirts and bowls emblazoned with a weather-related logo.

The selection goes far beyond clothing too.  Water bottles, clocks, mugs, bags and other novelties are part of the store’s offerings.  For the tech types, cases for iPhones and iPads are available.  Recently added products include laptop skins, clipboards and throw blankets.

Be sure to head over to WeatherGeekStuff.com and get that holiday gift today for your favorite weather geek. 

Support ThorntonWeather .com

Weather Geek Stuff is owned and operated by the same folks that run ThorntonWeather.com.  We provide ThorntonWeather.com as a no-cost service to the community and use the minimal amount of money made from Weather Geek Stuff to support the costs of running this website and the associated equipment.  So remember, if you have a weather buff on your shopping list, by buying from Weather Geek Stuff you are supporting ThorntonWeather.com!  You can also donate directly to fund the site here.

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Wednesday to see colder temperatures, less sun

Wednesday, December 14th, 2016 5:04am MDT

A cold front is moving through this morning and that is going to keep the mercury down today. While the high country will once again see snow, we will remain dry.

Look for mostly cloudy skies to start the day and similar sky conditions to be with us throughout the day. Winds will be out of the northeast and just a bit breezy at times. In terms of temperatures, we start out in the teens and will then warm to a high in the mid to upper 20s.

After today, we bounce right back with warmer weather tomorrow and Friday then the next system arrives Friday bringing a chance for snow into Saturday morning and cold temperatures through the weekend. More details in our extended forecast.

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Passing cold front brings chilly temps to Thornton

Tuesday, December 13th, 2016 5:17am MDT

The first in a series of two fronts is going to serve to cool things down a good bit today. A second moves through tonight leading to even colder readings tomorrow.

For today we start out with mostly sunny skies and expect the same to stick around all day. Some occasionally breezy winds can be expected. In terms of temps, look for highs today to top out in the mid to upper 30s.

The second front that moves through tonight will keep mercury readings below freezing tomorrow. We will be dry throughout.

Live weather gauges.

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Thornton’s workweek starts with a seasonal, pleasant day

Monday, December 12th, 2016 5:36am MDT

As we head back to work for the week we are going to enjoy a nice, late fall day. Temps will be a bit above normal, there will be plenty of sun and the only potential hiccup will come in the form of some breezy winds this afternoon.

We start out the day under mostly clear skies and similar conditions above will remain. A few spots may be seeing some fog early but those will burn off quickly once the sun comes up. Temperatures will be climbing toward a high in the mid-40s, a bit above the average for the date of 42 degrees. This afternoon will bring some gusty winds.

Have a great Monday!

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December 11 to December 17: This Week in Denver Weather History

Sunday, December 11th, 2016 6:00pm MDT
This Week In Denver Weather History

December 11 to December 17: This Week in Denver Weather History

This time of year snow is a common occurrence but in our look back at this week in Denver weather history we are struck by the lack of significant snow events in the history books for the period. What we do see instead are a number of high wind events, many of which caused widespread damage.

From the National Weather Service:


In 1939…more than 2 weeks of unseasonably warm weather made the month the 3rd warmest on record. Seven daily temperature records were set…including the all time record high temperature for the month of 79 degrees on the 5th. Daytime highs were balmy with 14 days in the 60’s and 70’s. Low temperatures dipped to freezing or below on only 5 days. The period was dry with only a trace of snow on the 12th.


In 1972…a protracted cold spell held an icy grip on metro Denver when maximum temperatures never reached above freezing for 10 consecutive days from the 3rd through the 12th and minimum temperatures dipped below zero on eleven consecutive days from the 5th through the 15th. Daily low temperature records were set with 15 degrees below zero on the 5th…17 degrees below zero on the 6th… And 18 degrees below zero on the 10th. Daily record low maximum readings were set with 3 degrees on the 6th and 6 degrees on the 9th. The very cold temperatures were caused by 3 to 5 inches of snow cover and a Canadian air mass.


In 1932…the second longest sub-zero period on record in Denver occurred. The temperature fell below zero shortly after 1:00 pm on the 8th and remained below zero for 92 hours until 9:00 am on the 12th. The lowest temperature recorded during this period was 13 degrees below zero on both the 9th and 11th. That temperature on the 11th was a record low for the date. High temperatures of 4 on the 8th…5 below zero on the 9th…1 below zero on the 10th… And 6 below zero on the 11th were record low maximum temperatures for those dates. Light north winds at 5 to 10 mph were accompanied by occasional light snow…which totaled only 2.2 inches.


In 1961…cold arctic air produced a protracted cold period. The temperature plunged to 16 degrees below zero on the 10th…establishing a new record for the date and the coldest reading since 25 degrees below zero on February 1… 1951. Low temperatures dipped below zero on 5 consecutive days with 9 degrees below zero on the 9th…16 below on the 10th…10 below on the 11th…and 12 below on both the 12th and 13th. High temperatures reached only 3 degrees on the 10th and 6 degrees on the 11th.


In 1933…downslope winds produced warm temperatures…resulting in record high minimums of 46 degrees on the 10th and 44 degrees on the 11th. High temperatures of 66 degrees on the 10th and 62 degrees on the 11th were not records. Southwest winds were sustained to 16 mph on the 10th.

In 1939…high temperatures of 70 degrees on the 10th and 74 degrees on the 11th were record maximums for the dates. The low temperatures of 39 degrees on the 10th and 41 degrees on the 11th were not records.

In 1948…high winds in Boulder and Louisville caused 1750 dollars in damage. Wind gusts in excess of 70 mph were reported at Valmont and Boulder airport. Chinook wind gusts to 60 mph briefly reduced the visibility to 1/4 mile in blowing dust at Stapleton Airport.

In 1989…the season’s greatest snowfall to date hit metro Denver with 6 to 12 inches of snow. Flight delays at Stapleton International Airport reached 2 hours. Multiple wrecks snarled traffic on I-25 both north and south of the city. Snowfall totaled 7.0 inches at Stapleton International Airport where north winds gusted to 25 mph on the 10th.


In 1938…snowfall totaled 3.7 inches in downtown Denver. North winds were sustained to 21 mph with an extreme velocity to 22 mph.

In 1967…wind gusts to 58 mph in downtown Boulder caused minor damage. Northwest winds gusted to 47 mph at Stapleton International Airport.

In 1980…winds to 60 mph were reported in Boulder. Northwest winds gusted to 23 mph at Stapleton International Airport. The Chinook winds warmed temperatures to a high of 67 degrees.

In 1994…strong gusty winds occurred along the Front Range eastern foothills. A wind gust to 67 mph was recorded in Boulder with a gust to 58 mph measured at Jefferson County Airport near Broomfield. No damage was reported. Northwest winds gusted to 31 mph at Stapleton International Airport.


In 1903…a sharp cold front on the 11th plunged temperatures from a high of 59 degrees to a low of 15 degrees…produced northeast winds sustained to 42 mph along with gusts as high as 60 mph…and produced 1.3 inches of snow overnight. The high temperature on the 12th was only 25 degrees.

In 1968…strong winds buffeted the eastern foothills and plains and caused light…but widespread property damage. Wind gusts of 50 to 75 mph were reported. West winds gusted to 52 mph at Stapleton International Airport.


In 1940…5.4 inches of snow fell across downtown Denver. This was the only snowfall of the month. Temperatures were quite cold on the 13th with a high of 6 degrees and a low of 2 degrees below zero.

In 1984…up to 6 inches of new snow fell over metro Denver… Hampering flight operations at Stapleton International Airport where snowfall totaled 3.8 inches and east winds gusted to 25 mph on the 11th.


In 1937…a thunderstorm…rare in December…produced 0.09 inch of rain in advance of a cold front.

In 1973…high winds occurred across all of metro Denver with the foothills area being hit the hardest. A wind gust to 120 mph was recorded in Boulder where damage to residences…mobile homes…fences…and buildings totaled 100 thousand dollars. A northwest wind gust to 66 mph occurred at Stapleton International Airport.

In 1988…strong winds were recorded in Boulder. Peak wind gusts reached 70 mph at Table Mesa and 61 mph in east Boulder. West winds gusted to 31 mph at Stapleton International Airport.


In 1916…snowfall totaled 5.7 inches in downtown Denver. Northeast winds were sustained to 27 mph with gusts to 28 mph on the 12th.

In 1992…an upslope snowstorm whitened metro Denver. While snowfall totaled only 4.1 inches at Stapleton International Airport…7 inches of new snow fell in Morrison…with 12 inches measured in Castle Rock. North winds gusted to 23 mph at Stapleton International Airport on the 13th.

In 1995…strong winds gusting to nearly 100 mph whipped across the foothills west of Denver. The strongest wind gusts included 98 mph atop squaw mountain and 75 mph at the Eldora Ski Area. West-northwest winds gusted to 41 mph at Denver International Airport on the 13th.


In 1921…downslope Chinook winds produced warm temperatures in the city…which resulted in 4 temperature records. High temperatures of 72 degrees on the 13th and 68 degrees on the 15th were record maximums for the dates. Low temperatures of 47 degrees on both the 12th and 13th were record high minimums for the dates. West winds were sustained to 38 mph on the 12th and to 25 mph on the 13th.

» Click here to read the rest of December 11 to December 17: This Week in Denver Weather History

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Thornton breaks out of the chill for Friday and the weekend

Friday, December 9th, 2016 5:25am MDT

Following a few days of Arctic cold, we see a return to more seasonal type temperatures and conditions for the three-day period. Overall warmer mercury readings and calmer weather conditions can be expected but a weak disturbance may mix things up just a bit Saturday. All-in-all, it should be a decent weekend for the city’s annual Winterfest.

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For Friday we start out quite cold and in the single digits. However we will be warming up nicely with highs right around 40 degrees – as long as the lingering snow cover doesn’t inhibit temperatures too much. Look for mostly sunny skies above throughout the day. Tonight we’ll be dipping down with lows in the low 20s.

On Saturday we will see mostly to partly sunny skies for most of the day with some increase in cloud cover in the afternoon and evening as a disturbance pushes through. Look for high temperatures in the upper 40s. As that system moves in, we stand just a slight chance to see a sprinkle of rain in the afternoon then a few snowflakes overnight and into Sunday morning. Lows Saturday night will be down to the mid to upper 20s.

Sunday starts out with the potential for a few lingering flurries and mostly cloudy skies. However as we get later into the morning cloud cover will decrease leaving partly to mostly sunny skies for the rest of the day. Temperatures will be topping out right near the average of 43 degrees.

Looking into next week, Monday should be somewhat similar to this weekend with dry conditions and temperatures close to normal. After that, we are watching another blast of cold air set to impact us starting Tuesday. Right now it doesn’t look like the cold with it will be extreme as the last blast but it will have a definite impact toward the colder side of things.

Have a great weekend!

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John Glenn, First US Astronaut to Orbit the Earth, Dies at 95

Friday, December 9th, 2016 4:17am MDT

John Glenn, the first U.S. astronaut to orbit the earth, has died at age 95, officials said. Glenn passed away Thursday, more than a week after being admitted to the Ohio State University’s James Cancer Hospital. The John Glenn College of Public Affairs at OSU made the announcement. U.S. President Barack Obama issued a statement saying… » Click here to read the rest of John Glenn, First US Astronaut to Orbit the Earth, Dies at 95

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The sun and dry conditions return but the Arctic cold remains

Thursday, December 8th, 2016 5:13am MDT

Our latest storm system has moved out and as long as you are looking out a window from the inside, today won’t seem too bad. Step outside though and you will be hit with the realization that we are seeing some extremely cold temperatures.

We start out the day with mercury readings well below zero, the first time we have gone negative since January 5, 2015. This type of cold is certainly not unusual but it doesn’t make it any more tolerable. Early on there will be some fog in low-lying areas, particularly along the Platte, so be careful. After that we’ll see mostly sunny skies throughout.

Despite the sun, temperatures are going to struggle to recover and we expect to see a high only in the mid to upper teens. Bundle up if you head out! How cold is it right now? Check our live gauges.

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