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Thornton, Colorado, USA
UpdatedMon, 23-Apr-2018 8:30pm MDT 
 

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Three-day period starts very warm then rest of weekend sees cooler, possibly wetter conditions

Friday, December 15th, 2017 4:31am MDT

Three-day period starts very warm then rest of weekend sees cooler, possibly wetter conditions. If you can, get out and enjoy the mild weather Friday because the rest of the weekend doesn’t look to be as nice. A cold front will be arriving Saturday bringing cooler temps and a chance for snow.

For today, look for mostly sunny to sunny skies to last throughout the day. Downslope winds out of the southwest should remain relatively light. Temps will climb toward a high close to the 60 degree mark.

Overnight tonight, partly cloudy skies will be above with lows near freezing.

Saturday sees things start to change. Mostly cloudy skies will be above and the mid to late morning sees a cold front push through the area. Highs tomorrow will be a good bit cooler, but still warmer than normal, and top out in the upper 40s.

Saturday night into Sunday morning, cloud cover remains pretty solid and temps drop a good bit with overnight lows in the mid-20s. We introduce a chance for snow, perhaps some freezing drizzle, from about 11:00pm Saturday night to 9:00am Sunday morning. Minimal accumulations are expected.

Sunday, once the precipitation ends, will see some clearing leading to partly sunny skies. Temperatures however will remain chilly with highs closing out the weekend only in the upper 30s.

Have a great weekend!

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Following the snow, conditions clear up, remain chilly

Thursday, December 14th, 2017 5:03am MDT

Snow. Finally. It didn’t amount to much but it had been 37 days since we last saw the white stuff but that streak finally came to an end for us. In its wake, Thursday will offer clearing skies but temperatures will remain chilly and winds breezy.

A few lingering flurries will be possible early but then quickly end. As they do, skies will begin to clear leading to mostly sunny skies for the balance of the day.

The afternoon is going to offer up some breezy winds that when coupled with the chilly temps will make it a bit uncomfortable. Look for a high temp today around 40 degrees.

Tonight, skies will be mostly clear and lows will did to the low to mid-20s.

You can keep an eye on current weather conditions here.

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A mild day Wednesday in Thornton then a decent chance for overnight snow

Wednesday, December 13th, 2017 4:58am MDT

It has been a long time since the “S word” has been in the forecast but here it comes. In fact, indications are that we are entering a period of active weather that will finally bring an end to the unseasonably warm weather of recent weeks.

For today, we start off with some cloud cover then will see that ease during the morning before building back up in the late afternoon and evening. Winds will be relatively light out of the southwest, then the west in the afternoon. We will once again see mild temperatures today with highs in the mid-50s.

As for the “S word”, a system working its way to us is holding together better than expected. Assuming that trend continues, this will bring big changes tonight. After about 9:00pm and lasting into tomorrow morning, we see decent chances for snow, enough so that we could see a quick inch or so out of it. The system is a fast mover so it won’t last long but we may finally get some much-needed precipitation.

Looking ahead, chilly temperatures linger tomorrow then we have a nice rebound Friday. That will be followed by another weather maker that may bring us snow over the weekend. Overall, indications point to a more seasonal weather pattern into next week and an end to the dry, very mild conditions of late.

More in our extended weather forecast.

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Denver ties the record high temperature for December 12

Tuesday, December 12th, 2017 4:37pm MDT

Record High TemperaturesOur very mild weather today led to another high temperature record, something we have seen a few time over the past month or so.

At 1:58pm, the high temperature in Denver reached 69 degrees as measured at Denver International Airport. This tied the record high for the date set in 1895.  The average high for the date is 43 degrees.

Today’s event is the fourth record high that has been set or tied in the last eight weeks (October 25, November 26, November 27).  The record high on November 27 of 81 degrees was also the warmest November reading ever recorded in Denver.

Here in Thornton we matched the Mile High City’s temperature with a reading of 69 degrees as well coming at 2:16pm.

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Lots of sun, very mild temperatures for Thornton’s Tuesday

Tuesday, December 12th, 2017 5:05am MDT

Another ‘copy and paste’ forecast from previous days. Very little change in the weather for today beyond bumping up temperatures a good bit.

Look for sunny skies throughout the day today with nary a cloud to be seen. Winds will be out of the southwest initially shifting to come from the west in the afternoon. As for temperatures, we will enjoy our warmest day of the week today. Highs will top out in the mid-60s, well above the average of 43 degrees for the date.

Tonight, skies remain clear with lows to right around freezing.

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December 10 to December 16: This week in Denver weather history

Monday, December 11th, 2017 6:24am MDT
This Week In Denver Weather History

December 10 to December 16: 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:

2-17

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.

3-15

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.

8-12

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.

9-13

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.

10

In 1953…snowfall totaled 3.8 inches at Stapleton Airport where northeast winds were sustained at speeds to 47 mph and gusted to 60 mph behind a cold front.

In 1969…sustained winds of 30 mph with gusts to 55 mph in downtown Boulder caused minor damage. Northwest winds gusted to 39 mph at Stapleton International Airport.

In 1980…winds to 60 mph whistled through Boulder.

In 1987…strong winds in the foothills spread over northern portions of metro Denver. Wind gusts of 60 to 75 mph were common in Boulder and southwestern weld counties. However… The highest reported wind gust…94 mph…occurred near Rollinsville. A northwest wind gust to 36 mph was recorded at Stapleton International Airport.

10-11

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.

11

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.

11-12

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.

11-13

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.

12

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.

12-13

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.

12-15

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.

13

In 1955…strong winds raked the foothills. A wind gust to 72 mph was recorded at Rocky Flats northwest of Denver. Some damage occurred in Boulder. Northwest winds were sustained to speeds of 23 mph at Stapleton Airport.

In 1988…high winds again occurred in Boulder where winds were clocked to 66 mph. West winds gusted to 43 mph at Stapleton International Airport.

13-14

In 1902…heavy snowfall totaled 6.4 inches in the city overnight. North winds were sustained to 18 mph with gusts to 20 mph on the 13th.

In 1925…heavy apparent post-frontal snowfall totaled 7.8 inches across downtown Denver. Northwest winds were sustained to 34 mph with gusts to 42 on the 13th… And north winds were sustained to 33 mph with gusts to 38 mph on the 14th.

In 1951…heavy snowfall totaled 5.9 inches at Stapleton Airport.

In 1987…a snowstorm dropped 2 to 8 inches of snow along the Front Range foothills. Eight to 12 inches fell just south of Denver. Icy streets and highways contributed to many traffic accidents across metro Denver and flights were delayed at Stapleton International Airport where 2.7 inches of snow fell and northeast winds gusted to 17 mph.

In 1991…high winds pummeled metro Denver. Wind gusts to 93 mph were recorded at Rollinsville. Wind speeds across metro Denver were generally 35 to 50 mph. Northwest winds gusted to 48 mph at Stapleton International Airport on the 13th.

14

In 1926…an intrusion of cold air resulted in temperatures remaining below zero. The high temperature of one degree below zero was a record low maximum for the date. The low temperature was 11 degrees below zero. North winds were sustained to 17 mph.

In 1985…a wind gust to 61 mph was recorded at Table Mesa in Boulder.

In 1996…high winds gusting from 60 to nearly 80 mph moved off the Front Range foothills and over the northeast Colorado plains in the wake of a fast moving cold front. The strongest wind gusts included 79 mph at Golden Gate Canyon and 70 mph near Table Mesa in southwest Boulder. At Denver International Airport…west-northwest winds gusted to only 39 mph.

» Click here to read the rest of December 10 to December 16: This week in Denver weather history

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Unseasonably warm weather continues into the workweek

Monday, December 11th, 2017 5:02am MDT

One thing about this weather pattern we are in, it makes creating our morning forecasts really easy. The narrative on the graphics remains pretty much the same and we just tweak the details. That looks to continue not only today but for much of the week ahead.

For today we start out with clear skies and will have overall sunny conditions throughout the day. Winds will be light and out of the southwest shifting to come from the southeast later this morning. Once again, the mercury will climb to well above normal with highs pushing close to the 60 degree mark.

Tonight, mostly clear skies will be above with lows in the upper 20s.

We see little change over the coming week in the high pressure ridge that has us stuck in this pattern. Thursday will offer some cooling behind a trough but otherwise, look for more of the same through the weekend. Get the details in the extended forecast here.

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California Wildfire One Of The Worst in State’s History

Monday, December 11th, 2017 3:29am MDT

Fire officials in the western U.S. state of California are focusing efforts on battling a wildfire northwest of Los Angeles that is already one of the largest and most destructive in the state’s history. » Click here to read the rest of California Wildfire One Of The Worst in State’s History

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Thornton’s weekend to start off with some wind but then become quite pleasant

Friday, December 8th, 2017 5:07am MDT

Following the chilly weather of the past week, we begin a nice warm-up today. While wind will be a bit of a factor on Friday, the rest of the period will be calm and pleasant.

For today, look for some clouds to start things off but then gradual clearing will occur throughout the day. By this afternoon we should be seeing mostly sunny skies. Temperatures will warm to highs close to the 60 degree mark. Most notable today will be breezy winds that will peak in the early afternoon before settling down by the evening.

Overnight tonight, skies will clear and we will see lows in the upper 20s.

Saturday will offer up lots and mild temps. Cloud cover should be pretty much non-existent so look for sunny skies. Mercury readings will again be well above normal with highs around 60 degrees.

Saturday night into Sunday morning, skies remain clear and the temperature drops to the upper 20s. T

he weekend closes out on Sunday with another nice day. Temperatures push to just above the 60 degree mark. Above, look for sunny to mostly sunny skies.

While it certainly would be nice to have some moisture, the good thing about the mild weather is that Mother Nature should have no effect on the city’s annual Winterfest celebration. Have a great weekend!

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Thornton’s Thursday offers cold temps, maybe a few snowflakes

Thursday, December 7th, 2017 5:10am MDT

Another chilly day today for us with some breezy winds to go with. While there is a slight chance for snow, we aren’t holding our breath.

The day starts with mostly clear skies but cloud cover will build through the morning leading to cloudy skies in the afternoon and evening. Winds will initially be light but then become breezy out of the north by mid-morning into the afternoon.

After a cold start we will warm up, but not a whole lot. Look for highs in the mid-30s. As for that possible snow, we really see the white stuff staying to the south of us. But, we can’t rule out a random snowflake or two from mid-afternoon into the evening. There just isn’t much moisture to work with so we may very well get nothing.

Tonight, skies remain pretty cloudy with temperatures dropping to the mid-20s.

We’ll enjoy a nice warmup starting tomorrow that will last through the weekend. More details on that in the extended forecast here.

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