Thornton, Colorado, USA
UpdatedWed, 22-May-2019 10:40pm MDT 


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

Thornton’s workweek starts out with cool temps, a good bit of sun

Monday, November 19th, 2018 4:38am MDT

A pleasant, fall day lies ahead for us. Temps will be just a touch below normal with mostly sunny skies above.

Mostly sunny skies start us off with a bit of a wave cloud above. That should ease early leaving us mostly sunny to sunny skies for the balance of the day. Overall conditions will calm and dry. Temperatures will top out in the upper 40s. Tonight, skies will be clear with overnight lows to the mid-20s.

As for the rest of the week, temperatures will be warmer through Friday and conditions dry and calm. We do still see our next storm system arriving early Saturday bringing a chance for snow. More in the extended forecast here.

Join the Discussion - Post your commentJoin the Discussion!

Thornton’s weekend weather to offer a mixed bag of mild and cold

Friday, November 16th, 2018 5:15am MDT

There’s a little bit of everything in the three-day outlook. We start unseasonably warm, then chill out considerably with some light snow and cold temps and follow that up with a nice rebound to sun and warmer temps.

Friday will be the warmest day of the period with highs in the low 60s. We start out mostly clear then will see clouds increase leading to partly sunny skies for much of the day.

This evening after dark, winds will pick up and become quite breezy as our next front pushes through. Mostly cloudy skies will be above tonight and, after midnight, we begin to see a chance for some freezing drizzle. We’re not expecting much accumulation of ice but if you head out early tomorrow you will want to be careful.

Saturday is going to be quite cold with highs only in the mid-20s. Cloudy skies will be above and light snow will be possible throughout the day. The evening will see the snow ease and come to an end. Total accumulations should remain less than an inch.

Overnight Saturday night into Sunday morning, skies will begin to clear and temps will get quite cold.

Sunday will close out the weekend pretty nicely. Overall sunny skies will be above and temperatures should rebound to the mid-40s.

Have a great weekend!

Join the Discussion - Post your commentJoin the Discussion!

Cold front to cool things down Thursday, bring a bit of wind with it

Thursday, November 15th, 2018 5:05am MDT

A cold front is working its way south toward us and while it isn’t particularly strong, it will have a bit of an impact. Cooler temperatures and some breezy winds will be the main features as a result.

The day starts with clear skies then by mid to late morning we will see a few clouds arrive but the afternoon should remain mostly clear. When the front arrives around mid-morning, winds will become breezy, then settle down in the late afternoon and evening.

Temperatures today will top out in the mid-50s, cooler than yesterday but still warmer than normal for the date.

Tonight, mostly clear skies will be above with lows dropping to around freezing.

Join the Discussion - Post your commentJoin the Discussion!

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

Thursday, November 15th, 2018 3:28am MDT
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!

Wednesday to offer calm, pleasant weather for Thornton

Wednesday, November 14th, 2018 4:59am MDT

The last of the chill wears off today and will make short work of any lingering snow. Aided by downslope flow, temps today will climb to above normal with lots of sun above.

Clear skies start things off and will continue through the day with few clouds. Winds will be relatively light out of the southwest and then south later. Temperatures start out below freezing but then will warm and push toward a high near the 60 degree mark.

Tonight, skies remain mostly clear with lows dipping to near freezing.

Join the Discussion - Post your commentJoin the Discussion!

Thornton’s Tuesday weather to offer calm conditions, cool temperatures

Tuesday, November 13th, 2018 5:01am MDT

A quiet fall day for us with plenty of blue sky and mercury readings getting close to normal.

The day starts out with some cloud cover but that will ease and for much of the day mostly sunny skies will be above. Winds will be light and out of the southwest. Temperatures start out cold but then will warm to a high near the 50 degree mark.

Tonight, skies will remain mostly clear with lows in the mid-20s.

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 MDT

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!

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

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

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 MDT

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 MDT

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!