Thornton, Colorado, USA
UpdatedMon, 12-Nov-2018 5:10pm MST 


ThorntonWeather.com on Twitter

ThorntonWeather.com on Facebook


Weather Geek Stuff - weathergeekstuff.com

Rocky Mountain Weather Network

Tony's Takes Photography


Recent News and Posts

November 2018 top shots: Monthly photo slideshow

Monday, November 12th, 2018 1:51pm MST
Cool clouds over Thornton on an unsettled day. (LE Worley)

Cool clouds over Thornton on an unsettled day. (LE Worley)

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 12, 2018
  • 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!

Join the Discussion - Post your commentJoin the Discussion!

The snow moves out and blue skies return but temps remain cloudy for Thornton’s Monday

Monday, November 12th, 2018 5:14am MST

That is a wrap on our first snowfall of November with Thornton netting a total of 4.1 inches. Today, that system moves out and we will see skies clear but the cold is going to linger.

Partly sunny skies start things out with clouds easing through the morning leading to mostly sunny skies this afternoon. Temperatures in the teens are greeting you early then we warm up, some, to a high today right near the freezing mark.

Tonight, mostly clear skies will be above with lows again dipping to the teens.

Warmer weather lies in wait through as the balance of the workweek should be pretty nice. Check out the extended weather forecast here.

Join the Discussion - Post your commentJoin the Discussion!

November 11 to November 17: This week in Denver weather history

Monday, November 12th, 2018 3:28am MST
This week in Denver weather history

November 11 to November 17: This week in Denver weather history

Two conditions seem to dominate Denver weather this time of year – snow and wind. Both of those make numerous appearances in our look back at this week in Denver weather history.

From the National Weather Service:


In 1911…a strong cold front produced snow and a cold wave. The temperature dropped 68 degrees from a high of 66 degrees at 12:40 pm on the 10th to a low of 2 degrees below zero at 7:15 am on the 11th. The low temperature of 23 degrees at midnight on the 10th was also the high temperature on the 11th. Northeast winds were sustained to 42 mph with gusts to 51 mph. Snowfall was only 2.5 inches.

In 1982…up to 4 inches of snow fell over the higher terrain between Denver and Colorado springs. Winds gusted to 50 mph along the foothills. Rainfall totaled 0.27 inch with only 0.1 inch of snow on the 11th at Stapleton International Airport where north winds gusted to 39 mph. Dense fog with visibilities as low as zero persisted all day on the 10th.


In 2014…an Arctic cold front on the 10th…associated with a strong storm system over the northern Rockies blasted into northeast Colorado. The temperature in Denver plummeted from the high of 64 degrees at 4:37 pm to 34 degrees by 5:53 pm. The temperatures continued to fall and dropped into the teens by early evening. The Arctic airmass remained entrenched over the region through the morning of the 14th…with the high temperatures failing to reach the teens from the 11th through the 13th. This was the first time since records have been taken in Denver…dating back to 1872…that there were three consecutive days with the maximum temperatures remained below 20 degrees in the month of November. In addition to the frigid temperatures…0.1 inch of snowfall was observed on 11th at Denver International Airport…which marked the first measureable snowfall for the season. An additional 2.2 inches of snowfall was measured on the 12th. Several temperature records were broken. A record low max of 16 degrees on the 11th broke the previous record of 19 set back in 1916. A record low max of 6 degrees on the 12th broke the previous record of 9 degrees…also set in 1916. The record low of -13 on the 12th…shattered the previous record of -4 degrees set back in 1872. Even more impressive…the record low of -14 degrees on the 13th broke the previous record of -3 degrees set back in 1916. The sudden drop in temperatures on the 10th…followed by several days of sub-freezing temperatures chilled trees to the core. The record drop in temperatures…preceded by mild fall temperatures…damaged or killed scores of trees across the Urban Corridor and Northeast Plains. At the time…the trees were not finished with the hardening process that enables them to withstand winter weather. Many were instantly flash-frozen…and some would not show signs of damage until spring of 2015. Of the 2.2 million trees in the city of Denver alone…tens of thousands were killed from the November frost. Denver estimated a citywide loss of more than 10 million dollars.


In 1901…a trace of rain fell in the morning…and a trace of snow fell in the afternoon. This was the only snowfall and precipitation for the month…ranking it the driest November on record…along with November of 1899 and 1949. The month also ranks as the second least snowiest November…along with Novembers in other years.

In 1903…northwest winds sustained to 45 mph with gusts to 56 mph warmed the temperature to a high of 56 degrees.

In 1912…rain changed to snow…which became heavy…and totaled 6.5 inches over downtown Denver. Precipitation was 1.02 inches…the greatest calendar day precipitation ever recorded in November. Northeast winds were sustained to 27 mph with gusts to 29 mph.

In 1919…light snow fell from an apparent clear sky during the early afternoon. The first snow was observed at about 12:40 pm and continued at least 30 minutes before clouds could be seen forming…followed by the sky becoming totally cloudy. During this time the temperature fell from 50 degrees at noon to only 18 degrees at 100 pm and plunged to 6 degrees at 5:45 pm. A low temperature of 2 degrees was recorded overnight. Northeast winds were sustained to 33 mph with gusts to 36 mph between noon and 1:00 pm behind an apparent arctic cold front. Snowfall was only 0.1 inch.

In 1949…north winds gusted to 50 mph at Stapleton Airport. A trace of rain fell. Another trace of rain on the 15th was the only precipitation of the month…making the month one of the driest Novembers on record and the least snowiest with no snow. This was the first November since 1882 without snow.

In 1959…strong northwest winds struck Boulder and the foothills causing some damage. West winds gusted to 37 mph at Stapleton Airport.

In 1995…strong downslope winds gusting to 84 mph blew out a few car windows in Boulder County. Winds gusted to 69 mph at Golden…Lakewood…and Table Mesa in Boulder. West-northwest winds gusted to 43 mph at Denver International Airport.

In 2000…heavy snow occurred in the foothills southwest of Denver and over Monument Ridge south of Denver. Snowfall totals included: 6.5 inches near Parker… 6 inches near Bergen Park…5 inches at Genesee and near Sedalia…and 4 inches at Coal Creek Canyon and St. Mary’s glacier. Snowfall totaled 1.6 inches at the site of the former Stapleton International Airport.

In 2003…strong downslope winds developed along the Front Range. Peak wind reports included 91 mph atop Blue Mountain near Wondervu and 75 mph in Boulder. Damaging winds downed power lines in Boulder County. North of Golden…a semi-truck was blown over by the winds near the intersection of State Highways 72 and 93 atop Rocky Flats. At the same location…blowing rocks shattered several car windows at an RTD Park and Ride. West winds gusted to 40 mph at Denver International Airport.


In 1922…a major storm dumped 14.1 inches of snowfall over downtown Denver. The most snow on the ground was 10.5 inches at 6:00 pm on the 12th. North winds were sustained to 21 mph on the 11th. Temperatures were generally in the teens and 20’s.

In 1964…strong winds in Boulder caused power outages and minor damage. Winds gusted to 42 mph in downtown Boulder. At Stapleton International Airport west winds gusted to 36 mph on the 11th and 35 mph on the 12th.

In 1976…snow and freezing drizzle caused icing on bridges… Overpasses and some main roads. The elevated portion of I-70 was closed for a time during the afternoon of the 11th. Snowfall totaled only 0.8 inch at Stapleton International Airport…where northeast winds gusted to 20 mph on the 11th.

In 1989…the temperature climbed to a maximum of 76 degrees on both days…setting new record highs for each day.

In 1995…hurricane force downslope winds whipped across the Front Range foothills overnight. The National Center for Atmospheric Research in Boulder registered a peak wind gust to 124 mph with several more wind gusts over 100 mph. Utility poles and power lines were downed…leaving several hundred homes in Boulder without power. Windows were blown out of cars in Boulder. Other reports of strong wind gusts included: 108 mph atop Squaw Mountain west of Denver…104 mph at Table Mesa in Boulder…99 mph at Golden Gate Canyon… 85 mph at the Rocky Flats Environmental Technology site… 69 mph at Jefferson County Airport near Broomfield…and 62 mph in Lakewood. West-northwest wind gusts to 40 mph were recorded at Denver International Airport on the 12th.

» Click here to read the rest of November 11 to November 17: This week in Denver weather history

Join the Discussion - Post your commentJoin the Discussion!

Thornton’s weekend weather to start off warmer, end colder with snow

Friday, November 9th, 2018 5:05am MST

Looking at the forecast for the next three days, on the plus side, we will see warmer, dry conditions Friday and Saturday. Veterans Day however turns much colder and brings a decent chance for snow.

For today, sunny skies will be the rule throughout the day. Temperatures start out quite cold but should warm up nicely with a high in the mid-40s. Tonight partly cloudy skies will be above with lows dipping to around 20 degrees.

Saturday will be the warmest day of the period with highs in the mid-50s. We will have some clouds above but should still be clear enough to call for mostly sunny skies. The next storm system arrives Saturday night.

Temperatures overnight Saturday into Sunday will dip to the mid-20s under mostly cloudy skies. By dawn Sunday, we could be seeing a few flakes of snow.

Cloudy skies will be the rule on Veterans Day with a high temperature only near freezing. Light snow will be possible throughout the day with the best chances coming in the afternoon. Right now, an inch or so seems to be possible. Snow will end overnight Sunday night and skies will begin to clear.

Have a great weekend and thank you all our nation’s veterans – we are forever in your debt!

Join the Discussion - Post your commentJoin the Discussion!

Thornton’s Thursday weather to offer up chilly temperatures, some breezy winds

Thursday, November 8th, 2018 5:05am MST

Our latest disturbance has moved through and with it ushered in some chilly temperatures. We will be dry today but do expect a bit of wind.

The day starts off with a good bit of cloud cover but that will begin to ease early leading to mostly sunny skies by late morning and lasting through the rest of the day.

High temperatures today will be topping out only around 40 degrees. Some breezy winds can be expected from late morning through the first part of the afternoon making it feeler colder than what the thermometer might say.

Tonight, skies will be mostly clear with temperatures dropping to the upper teens.

Want a sneak peek at the coming weekend’s weather? See here.

Join the Discussion - Post your commentJoin the Discussion!

Colder temperatures, less wind for Thornton’s Wednesday

Wednesday, November 7th, 2018 4:56am MST

With the passing of a cold front late yesterday, we cool down quite a bit today. There will, thankfully, be less wind though.

Partly cloudy skies will be above throughout the day, perhaps a bit easing in coverage for a few hours later this morning before increasing again. Temperatures today will top out in the low to mid-40s, well below the average for the date of 56 degrees.

From this evening through the early morning tomorrow we do have just a slight chance to see some snow. However, even if some does fall, it isn’t expect to amount to anything appreciable. Overnight lows tonight will drop to the mid-20s.

Join the Discussion - Post your commentJoin the Discussion!

November 4 to November 10: This week in Denver weather history

Tuesday, November 6th, 2018 6:02am MST
This week in Denver weather history

November 4 to November 10: This week in Denver weather history

Our look back at this week in Denver weather history is shorter than what we often see which shows the normally quiet weather we see in November. However there are still significant weather events in the past, most of which involved heavy snow and powerful winds.

From the National Weather Service:


In 1946…a major snow storm dumped 30.4 inches of heavy snowfall downtown and 31.0 inches at Stapleton Airport. The winter storm closed schools and disrupted all forms of transportation in the city. The greatest depth of snow on the ground was 28 inches at the airport. The duration of the snowfall…from 4:22 am on the 2nd to 3:08 am on the 5th… A total of 70 hours and 46 minutes…is the second longest period of continuous precipitation on record and the second heaviest snowfall of record at the time in Denver. The 17.7 inches of snowfall on the 2nd and 3rd was the greatest 24- hour snowfall ever recorded during the month of November. Buses and street cars had a difficult time…and many cars were abandoned along roadsides and streets for several days. Secondary roads in rural areas were blocked for 2 to 3 weeks. Several buildings in the city collapsed or were damaged from the weight of the heavy snow. Football games were canceled. Livestock losses were high over eastern Colorado. The precipitation from this storm alone exceeded the greatest amount ever recorded in Denver during the entire month of November previously. The precipitation recorded downtown was 2.03 inches…and the previous record for the entire month of November was 1.95 inches in 1922. North winds were sustained to 26 mph on the 2nd.


In 1994…a fast moving snow storm dumped 8 to 9 inches of snow on Boulder…Broomfield…and Lafayette. Snowfall totaled only 1.8 inches at Stapleton International Airport where on the 3rd east winds gusted to 20 mph and some freezing drizzle fell.


In 1940…a trace of snow fell in downtown Denver. This marked the start of the shortest snow season on record… 167 days…through April 19…1941…when 0.4 inch of snow fell.

In 1959…high winds caused damage in many areas of the eastern plains.

In Denver…winds averaged 40 mph with gusts to 70 mph. Some damage was reported to utility lines…signs…and vehicles. Northeast winds were sustained to 30 mph at Stapleton Airport.


In 1933…the first measurable snow of the season totaled only 2.5 inches. This was the only measurable snow of the month. Northwest winds were sustained to 27 mph on the 4th.

In 1951…heavy snowfall of 5.7 inches was measured at Stapleton Airport where northwest winds gusted to 32 mph.


In 1896…west Chinook winds sustained to 44 mph with gusts to 46 mph warmed the temperature to a high of 56 degrees in the city.

In 1919…a rare November thunderstorm produced a mixture of rain and snow during the evening. Precipitation totaled only 0.14 inch with only a trace of snow. Northeast winds were sustained to 39 mph with gusts to 44 mph.

In 1948…a west-northwest wind gust to 50 mph was recorded at Stapleton Airport.

In 1994…winds gusted to 76 mph on the summit of Squaw Mountain…5 miles south of Idaho Springs.

In 2000…snow fell in the foothills west of Denver and across the southern suburbs. Snow totals included 6 inches near Evergreen…11 miles southwest of Morrison… And 7 miles south of tiny town and 5 inches in Aurora and Parker. Snowfall totaled 5.5 inches at the site of the former Stapleton International Airport. Northeast winds gusted to 26 mph at Denver International Airport where the visibility was reduced to 1/4 mile in heavy snow at times.

5-6 » Click here to read the rest of November 4 to November 10: This week in Denver weather history

Join the Discussion - Post your commentJoin the Discussion!

Tuesday to offer a nice bit of sun, cooler than normal temps

Tuesday, November 6th, 2018 5:07am MST

Not too bad of a day ahead for Thornton but one with some cool mercury readings. There will be plenty of sun though but with some breezy winds.

Clear skies start things off then we will see a few clouds arrive. Mostly sunny skies should be the general rule though. Temperatures will top out around 50 degrees, about 7 degrees below normal for the date. We do expect some breezy winds from late morning into the early afternoon.

Tonight, partly clear skies will be above with lows dipping to the mid-20s. Keep an eye on current conditions here.

Join the Discussion - Post your commentJoin the Discussion!

Thornton’s workweek starts with a continuation of the cool temps, breezy winds

Monday, November 5th, 2018 5:01am MST

Not a lot of variance in today’s weather from what we have been seeing of late. Temperatures will remain cooler than normal with some breezy PM winds but we should see more sun.

The day starts out with partly clear skies but will see gradual clearing from the start. By this afternoon, mostly sunny skies will be above.

Temperatures will top out in the mid-50s, close to, but just shy of the average for today’s date of 57 degrees. As for the winds, look for them to pick up the pace after noon then settle down after sunset.

Tonight, mostly clear skies will be above with lows near freezing.

Join the Discussion - Post your commentJoin the Discussion!

October 2018 weather recap: Cooler than normal temps, near normal precipitation

Sunday, November 4th, 2018 1:32pm MST

Fall arrived in earnest during the month of October 2018 as temperatures cooled considerably and we saw our first snowfall of the season.

The first two weeks of the month were notable for seeing 12 of 17 days with below normal temperatures. Five days in a row with measurable rain came from the 4th to the 9th and then on the 14th we saw that first snowfall.

The latter half of the month warmed up with above normal mercury readings being seen on all but the last two days of the October.  That same stretch of mild days also was one in which we saw no precipitation.

While the overall warm end of the month helped, we still saw overall monthly temperature readings well below normal.

Thornton’s average monthly temperature came in at 47.0 degrees. This is in comparison to Denver’s long term October average of 50.9 degrees, a near 4 degree difference.  Out at Denver International Airport where the Mile High City’s official readings are taken, it was a bit warmer with an average for the month of 49.2 degrees.

Here, we ranged from a high of 85.7 degrees on the 3rd down to a low of 18.1 degrees on the morning of the 15th. Denver saw a max of 86 degrees and a low of 18 degrees, each on the same days as our max and min.

Denver set two temperature records during the month.  The high temperature of only 27 degrees on the 14th set a new record low maximum for the date. This easily bested the old record of 36 degrees set in 1969. A record low temperature reading of 18 degrees on the 15th topped the previous record low for the date of 20 degrees set in 1970.

In terms of precipitation, Thornton recorded 1.01 inches between rain and snow melt.  Denver was very similar with a total of 0.99 inches.  Both measurements were close to the long term Denver average of 1.02 inches for the month.

Thornton saw a relatively minimal 2.8 inches of snowfall, all on the 14th. Denver recorded a bit more of the white stuff with 3.2 inches. Both were short of the October average of 4.0 inches.

Click here to view Thornton’s October 2018 climate report.

Thornton, Colorado's October 2018 temperature summary. (ThorntonWeather.com)

Thornton, Colorado’s October 2018 temperature summary. (ThorntonWeather.com)

Thornton, Colorado's October 2018 precipitation summary. (ThorntonWeather.com)

Thornton, Colorado’s October 2018 precipitation summary. (ThorntonWeather.com)



                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
 HIGH              90   10/01/1892
 LOW               -2   10/29/1917
HIGHEST            86   10/03        83       3       84  10/25
LOWEST             18   10/15        22      -4       13  10/27
AVG. MAXIMUM     61.6              65.3    -3.7     64.5
AVG. MINIMUM     36.8              36.6     0.2     35.7
MEAN             49.2              50.9    -1.7     50.1
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      1               0.4     0.6        0
DAYS MIN <= 32      7               8.5    -1.5       11
DAYS MIN <= 0       0               0.0     0.0        0

 MAXIMUM         4.17   1969
 MINIMUM            T   1934
TOTALS           0.99              1.02   -0.03     0.96
DAILY AVG.       0.03              0.03    0.00     0.03
DAYS >= .01         9               5.3     3.7        5
DAYS >= .10         3               2.4     0.6        4
DAYS >= .50         0               0.5    -0.5        0
DAYS >= 1.00        0               0.1    -0.1        0
 24 HR. TOTAL    0.31   10/07 TO 10/07           10/09 TO 10/09

TOTAL             3.2               4.0

HEATING TOTAL     487               440      47      455
 SINCE 7/1        565               581     -16      585
COOLING TOTAL       4                 5      -1        1
 SINCE 1/1       1026               769     257      881

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

AVERAGE WIND SPEED              9.7

AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            7
NUMBER OF DAYS PC             16


THUNDERSTORMS             5      MIXED PRECIP       2
HEAVY RAIN                0      RAIN               3
LIGHT RAIN               12      FREEZING RAIN      0
LIGHT FREEZING RAIN       0      HAIL               0
HEAVY SNOW                0      SNOW               3
LIGHT SNOW                6      SLEET              0
FOG                      11      DENSE FOG          4
HAZE                      2

Join the Discussion - Post your commentJoin the Discussion!