Thornton, Colorado, USA
UpdatedSun, 04-Dec-2016 11:15am MST 


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Thornton’s weekend starts cold with chance for snow then will warm up

Friday, December 2nd, 2016 5:02am MST

The three day period offers a little bit of a mixed bag of weather. A disturbance moving through today will keep things chilly and may drop just a little bit of snow. After that however, we see improving conditions and warming temperatures Saturday and Sunday.

For Friday look for mostly cloudy skies to be above. Some light snow / flurries will be possible with the best opportunity coming this afternoon. Temperatures will be cold with highs topping out in the mid-30s today. Overnight tonight skies will be begin to clear and temperatures drop to the teens.

Saturday will still have a few clouds but offer up mostly sunny skies overall. Conditions will be calm and dry as we head to a high in the mid-40s.

We close out the weekend with the most pleasant day of the period. Look for a healthy dose of sun Sunday with temperatures climbing to highs right near the 50 degree mark.

All eyes remain on the Arctic air mass that is working its way down to us and will bring big changes starting Tuesday. We’ll see temperatures plunge for a few days but are not currently expecting much in the way of snow. More in our extended forecast.

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November 2016 weather recap: Month was much warmer than normal, offered little precip

Thursday, December 1st, 2016 2:18pm MST

The month of November 2016 was certainly an unusual one for Thornton.  Despite a turn toward colder weather at the end, the extraordinary warmth at the start was the dominating feature. We did finally receive our first snow of the season although we are far behind normal for the season.

Dominating high pressure was a recurring theme for the first half of the month.  This kept storm systems and colder temperatures at bay bringing unseasonably warm mercury readings.  Every one of the first 16 days of the month saw temperatures in excess of 60 degrees, five saw readings warmer than 70 degrees and one even hit over 80 degrees.

A series of troughs and cold fronts finally brought an end to the record-setting warmth.  After recording 81.5 degrees of the 16th, we followed with a 40.9 degree high on the 17th.  The 17th also brought our first, and thus far only, snowfall of the season.  The balance of the month saw things return to a more typical November weather pattern.

Thornton’s average monthly temperature for November 2016 came in at 43.9 degrees.  This was far above Denver’s historical average for the month of 38.3 degrees.  Out at the airport where the Mile High City’s official measurements are kept, the average came in warmer still at 45.1 degrees.  That put November 2016 into the books at the 10th warmest November in Denver weather history.

Temperatures in Thornton ranged from the aforementioned high of 81.5 degrees on the 16th down to a low of 13 degrees on the morning of the 30th.  DIA’s high was 80 degrees and its low 10 degrees, each on the same day as Thornton’s maximum and minimum.  The 80 degree reading on the 16th was not only a record for the date but also the latest 80 degree temperature ever recorded in Denver.

In terms of precipitation, Denver averages 0.61 inches during the month of November.  Thornton fell far short of that with a mere 0.24 inches of precip in the bucket. Out at the airport, Denver fared better with 0.52 inches.

Thornton recorded 2.2 inches of snow for the month while Denver ended with 1.7 inches.  Both were far below the November average of 8.7 inches and comprise the only snowfall we have seen this season.  The snow on the 17th was the third latest first seasonal snowfall on record in Denver.

Click here to view Thornton’s November 2016 climate report.

Thornton, Colorado's November 2016 temperature summary. (ThorntonWeather.com)

Thornton, Colorado’s November 2016 temperature summary. (ThorntonWeather.com)

Thornton, Colorado's November 2016 precipitation summary. (ThorntonWeather.com)

Thornton, Colorado’s November 2016 precipitation summary. (ThorntonWeather.com)

From the National Weather Service:

638 AM MST THU DEC 1 2016




                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
 HIGH              80   11/16/2016
 LOW              -18   11/29/1877
HIGHEST            80R  11/16        73       7       75  11/03
LOWEST             10   11/30         6       4        3  11/27
AVG. MAXIMUM     59.9              52.1     7.8     51.2
AVG. MINIMUM     30.4              24.5     5.9     25.7
MEAN             45.1              38.3     6.8     38.5
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      1               2.3    -1.3        5
DAYS MIN <= 32     15              23.4    -8.4       24
DAYS MIN <= 0       0               0.6    -0.6        0

 MAXIMUM         3.21   1946
 MINIMUM            T   1899
TOTALS           0.52              0.61   -0.09     2.13
DAILY AVG.       0.02              0.02    0.00     0.07
DAYS >= .01         2               4.7    -2.7       11
DAYS >= .10         2               1.6     0.4        6
DAYS >= .50         0               0.0     0.0        1
DAYS >= 1.00        0               0.0     0.0        0
 24 HR. TOTAL    0.30   11/22 TO 11/22           11/04 TO 11/05

 TOTAL            1.7               8.7
RECORD NOVEMBER  42.5                      1946

HEATING TOTAL     586               801    -215      789
 SINCE 7/1        896              1382    -486     1090
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        878               769     109      877

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

AVERAGE WIND SPEED              9.8

AVERAGE SKY COVER           0.40
NUMBER OF DAYS FAIR           14
NUMBER OF DAYS PC             12


THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN                1     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                1     SNOW                       1
LIGHT SNOW                2     SLEET                      0
FOG                       2     FOG W/VIS <= 1/4 MILE      1
HAZE                      1

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Thornton’s December preview: With arrival of winter, cold and snow increase

Thursday, December 1st, 2016 11:32am MST

The month of December brings with it the official start of winter and oftentimes, colder and snowier weather conditions. It however can also offer unseasonably warm temperatures and bone dry conditions.  Given our recent mild and dry weather, we are certainly hoping for a change in the coming month.

Overall December’s monthly mean temperature of 30.0 degrees (1981 – 2010 averages) makes it our coldest month.  Snow is always on everyone’s mind this time of year but December is only our 3rd snowiest month behind March and November with an average of 8.5 inches of the white stuff.

We closed out November quite wet and chilly and that is expected to continue into the first part of December.  Long term models then point to a continuation of above normal precipitation but near normal temperatures.

Get all the details on Thornton’s December weather including a look back at historical events and a look at the long range forecast in our December weather preview here.

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Chilly temperatures, a good bit of clouds for Thornton’s Thursday

Thursday, December 1st, 2016 5:01am MST

The biggest difference between today’s weather and yesterday’s will be the increased cloud cover. Temperatures will be similar and remain below normal but with overall calm conditions.

We start out the day with perhaps a bit of sun then will have mostly cloudy skies above for the balance. Temperatures today will be topping out right near the 40 degree mark, about 5 degrees below normal for the date.

Live weather gauges here.

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November 27 to December 3: This Week in Denver Weather History

Thursday, December 1st, 2016 4:18am MST
This Week In Denver Weather History

November 27 to December 3: This Week in Denver Weather History

Cold, snow and wind are the dominant conditions we see in our look back at this week in Denver weather history. All three are common this time of year and extremes with those conditions seem to be unusually common as well.

Among the highlights are numerous high wind events that not only caused damage but also injury to unprepared residents. Significant snowfall also appears many times including a storm in 1983 that shut down the city for the Thanksgiving weekend and left snow on the ground for 63 days.

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From the National Weather Service:


In 1978…heavy snowfall of 6.0 inches was measured at Stapleton International Airport where north winds gusted to 20 mph. Most of the snow…4.8 inches…fell on the 25th. The greatest amount of snow measured on the ground was 5 inches due to settling and melting.


In 1952…the average coldest 4-day period in November in the previous 81 years of record occurred. Maximum temperatures of 19…15…21…and 25 degrees were recorded. Minimum temperatures were below zero each day with readings of 7 below…6 below…5 below…and 6 below.


In 1985…dense fog with visibilities as low as 1/8 mile occurred on five consecutive days at Stapleton International Airport. The fog was at times accompanied by light snow… Light freezing drizzle…or ice crystals. Fog occurred all day on both the 26th and 29th.


In 1876…heavy snowfall totaled 9.0 inches over the city from 5:00 pm on the 26th through 5:00 p.m. on the 27th. Precipitation was 0.30 inch on the 25th and 0.60 inch on the 27th.

In 1919…an incursion of cold arctic air produced snowfall of 4.6 inches over downtown Denver. Temperatures dipped to 5 degrees below zero on the evening of the 26th and recovered to a high of only 1 degree below zero on the 27th…the all-time record low maximum for the month of November and the record for the date. Northwest winds were sustained to 25 mph with gusts to 26 mph on the 26th.

In 1923…snowfall of 2.0 inches was the only snow of the month. North winds were sustained to 22 mph on the 26th.

In 1972…heavy snowfall totaled 7.5 inches at Stapleton International Airport where north winds gusted to only 18 mph on the 27th.

In 1983…a Thanksgiving blizzard dumped 21.5 inches of snowfall in 37 hours with a maximum of 18 inches on the ground at Stapleton International Airport. The storm produced howling winds…which paralyzed Thanksgiving weekend transportation across all of eastern Colorado. On the 27th…Stapleton International Airport closed… Opening 24 hours later. Interstate highways were closed in all directions…but west…from Denver. At Stapleton International Airport…north winds gusted to 36 mph on the 26th and to 29 mph on the 27th. However…most wind speeds across metro Denver were 15 to 30 mph. Temperatures hovered in the teens and lower 20’s. Many stores and businesses closed. Several high school football games were postponed. Across metro Denver…snow depth varied from 15 inches in Commerce City to 28 inches near Chatfield Reservoir. Snow removal in Denver was estimated at 1.5 million dollars. Following the storm… An inch or more of snow remained on the ground for 63 consecutive days through January 27…1984. This is the longest period of continuous snow cover ever recorded in Denver.

In 1990…an early winter storm deposited 2 to 8 inches of wet snow across metro Denver. Snowfall totaled 3.4 inches at Stapleton International Airport where northeast winds gusted to 30 mph on the 26th.

In 1993…strong winds swept off the foothills across metro Denver. Sustained winds of 30 to 50 mph were common across the area. Wind gusts to 67 mph were recorded atop Squaw Mountain near Idaho Springs. West winds gusted to 36 mph at Stapleton International Airport on the 26th. The strong winds produced some blowing snow…reducing the visibility to less than one mile at times.

In 1995…snowfall totaled 3.7 inches at the former Stapleton International Airport site. The foothills west of Denver received 4 to 7 inches of snow. North-northeast winds gusted to 34 mph at Denver International Airport on the 26th.


In 1965…strong winds buffeted Boulder…causing 11 thousand dollars in damage. Wind gusts to 75 mph were recorded downtown. West winds gusted to 38 mph at Stapleton International Airport.

In 1994…winds gusted to 87 mph atop Squaw Mountain…5 miles south of Idaho Springs…and to 84 mph on Fritz Peak near Rollinsville in the foothills southwest of Boulder. Northwest winds gusted to 40 mph at Stapleton International Airport.


In 1884…a windstorm during the afternoon produced northwest sustained winds to 46 mph. Two wooden slats were blown out of the weather instrument shelter…and nearly all of the slats on the north and west sides were loosened.

In 1898…northwest winds were sustained to 50 mph with gusts as high as 80 mph.

In 1902…northwest winds were sustained to 40 mph with gusts to 48 mph. The strong apparent Bora winds warmed the temperature to a high of only 40 degrees.

In 1904…northwest winds sustained to 44 mph with gusts to 58 mph warmed the temperature to a high of 58 degrees.

In 1927…strong west winds occurred in Boulder…causing widespread minor damage. A wind gust to 65 mph was recorded at Valmont east of Boulder. The west winds possibly produced a cyclonic twist.

In 1928…heavy snowfall totaled 7.0 inches over downtown Denver.

In 1957…a vigorous cold front produced north-northeast wind gusts to 54 mph at Stapleton Airport. Light snow following the front totaled only 0.2 inch.

In 1970…strong Chinook winds reached 77 mph in downtown Boulder.

In 1978…wind gusts 60 to 90 mph were reported in and near the foothills.

In 1984…high winds of 60 to 80 mph occurred along the Front Range eastern foothills.

In Boulder…the high winds blew the roof off a service station. Several trees were felled… Damaging some cars. An elderly woman was injured when she was knocked down by a wind gust and blown 20 feet into some bushes. Northwest winds gusted to 36 mph at Stapleton International Airport.

In 1994…winds gusted to 72 mph in Boulder. No damage was reported. Northwest winds gusted to 35 mph at Stapleton International Airport.


In 1908…heavy snowfall overnight and for most of the day on the 29th totaled 12.5 inches. Precipitation was 1.09 inches. Northwest winds were sustained to 26 mph on the 29th.

In 1928…a major storm dumped 15.5 inches of snowfall on downtown Denver. North winds were sustained to 18 mph with gusts to 19 mph on the 28th.

In 1992…an upper level storm system moved across metro Denver…but left only a dusting of snow. Snowfall totaled only 1.6 inches at Stapleton International Airport where north winds gusted to 25 mph. Other snow amounts included: 8 inches at Conifer…6 inches at Lake Eldora…3 inches at Rollinsville and in southeast Denver.

In 1997…a storm system tracking across northern New Mexico produced strong north to northeast upslope flow against the eastern slopes of the Front Range and Palmer Ridge. Snowfall totals in Jefferson County included: 14 inches near Deckers; 12 inches at Castle Rock and Sedalia; 10 inches near Conifer…11 miles southwest of Morrison…and at Buffalo Creek. Elsewhere…snow accumulations were less. Snowfall totaled only 0.7 inch at the site of the former Stapleton International Airport on the 27th and 28th.

In 2004…heavy snow fell in the foothills and across metro Denver. In the foothills…snowfall totals included: 13 inches at Roxborough State Park and Eldorado Springs… 11.5 inches near Conifer…11.0 inches near Nederland…and 10 inches near Indian Hills. Across metro Denver snowfall totaled 14 inches near Sedalia…9 inches near Louisville… 8 inches at Ralston Reservoir…and 5.1 inches in the Stapleton area of Denver. Northeast winds gusted to 28 mph at Denver International Airport on the 28th.

In 2006…a slow moving storm system brought heavy snow to the mountains and to the eastern foothills where snowfall ranged from 8 to 18 inches. Some of the more impressive snow totals included: 18 inches at Genesee…17.5 inches near Boulder…17 inches at Aspen Springs…16.5 inches 10 miles northwest of Golden…15 inches at Eldorado Springs… 14.5 inches in Idaho Springs and near Jamestown…12 inches in grant and near Indian Hills…11.5 inches near Blackhawk… 11 inches at Gross Reservoir and Eldora…and 10.5 inches in Conifer. Across metro Denver…storm total snowfall generally ranged from 5 to 9 inches with the heaviest amounts near the foothills in Boulder and Jefferson counties. The most impressive totals included: 15.5 inches at Ken Caryl…12 inches in Boulder…7.5 inches near Morrison…and 7 inches near both Chatfield and Ralston reservoirs. Snowfall totaled only 4.2 inches in the Denver Stapleton area. Northeast winds gusted to 31 mph at Denver International Airport on the 28th.

» Click here to read the rest of November 27 to December 3: This Week in Denver Weather History

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November 2016 top shots: Monthly photo slideshow

Wednesday, November 30th, 2016 7:30pm MST
An aerial view of sunset in Thornton on November 14, 2016. (Shannon Dizmang)

An aerial view of sunset in Thornton on November 14, 2016. (Shannon Dizmang)

Typically November is a quiet weather month with plenty of nice, fall days but it can also turn wet with healthy doses of snow and moisture.  The wide variety of conditions can create picturesque scenes ranging from blue skies and snow-capped mountains to a wintry wonderland in the metro area.

November is the second snowiest month of the year so winter conditions are not unusual.  Typically though, these bouts of cold are short-lived and normal daytime conditions are pleasant.

Outdoor activities continue to be quite popular during the month.  The cooling temperatures do oftentimes lead to an increase in wildlife activity.

All of the above help lead to a month in which a wide variety of scenes, flora and fauna can be captured.

  • Slideshow updated November 28, 2016
  • 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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Wednesday remains a bit chilly but with less wind

Wednesday, November 30th, 2016 5:06am MST

Weather conditions today become a bit more stable. Temperatures will remain below normal however we will enjoy a break from the wind.

We start out the day with mostly clear skies and that should continue throughout the day. Temperatures start out very cold but then will gradually warm toward a high in the low 40s. Average for the date is 46 degrees.

Looking ahead, we’ll be seeing a bit of a roller coaster over the next week or so as a series of systems impact us. We’ll be dry tomorrow but with more clouds and slightly cooler temps as the next weather-maker approaches. Friday will see much colder conditions with perhaps a shot of light snow.

We then warm back up a bit for the weekend and Monday before our next system comes through late Monday into Tuesday. Models are pointing to that system bringing the coldest readings of the season so far. Unfortunately we are not convinced there will be a lot of snow with it.

In the meantime, enjoy the calm, clear conditions today.

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Chilly temperatures, breezy winds for Thornton’s Tuesday

Tuesday, November 29th, 2016 5:16am MST

A diving jet stream will be pulling cooler air from the north today bringing cooler temperatures to the air. That will be coupled with wind caused by a strong pressure gradient making for what won’t be an overly pleasant day.

We start out the day with partly clear skies but will then see an increase in coverage with mostly cloudy skies for the balance. Temperatures today will start out quite chilly and below freezing then work toward a high of around 40 degrees.

The main weather feature will be the aforementioned wind. Speeds will increase this morning and by about noon be topping out with gusts to 30mph. Coupled with the chilly temperatures, it will be a bit uncomfortable outdoors.

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

Monday, November 28th, 2016 6:02pm MST

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. 

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Thornton’s workweek starts seasonal, then turns colder

Monday, November 28th, 2016 5:03am MST

Earlier in the month many were wanting an end to unseasonably warm weather. That certainly has happened and while today will be a typical day for this time of year, the rest of the week will see things cool considerably.

For today we will see partly sunny skies above throughout the day. Temperatures will be warming to a high in the mid-40s, right near the average for the date of 46 degrees. Winds will be lighter today than yesterday, just a bit breezy in the afternoon.

The next system will be moving through later today and that is going to bring colder temperatures and another healthy shot of wind on Tuesday. From there, a series of reinforcing cold fronts will drive high temperatures downward at least through Friday. One system late Thursday into Friday may bring a quick shot of snow but right now it doesn’t look like it will amount to much.

More details in the extended forecast.

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