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Thornton, Colorado, USA
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Tuesday to offer mild temperatures, some breezy winds

Tuesday, December 21st, 2021 5:32am MST

These forecasts have gone beyond being repetitive and are quite boring at this point. Once again Thornton will see mild temperatures, dry conditions and some breezy winds.

The day starts off with some cloud cover but that will ease quickly this morning leading to mostly sunny skies for the majority of the day. West winds will be picking up by mid-morning with breezy conditions expected into the evening. High temperatures will top out around 60 degrees.

Tonight, lows will dip to a bit below freezing under mostly clear skies.

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Mild temperatures, lots of sun start Thornton’s workweek

Monday, December 20th, 2021 5:06am MST

We are set to continue the mild, dry conditions of recent weeks not only for today but through much of the week.

For today, mostly clear skies start us off then most cloud cover will be done by mid to late morning leading to sunny skies. Overall conditions will be calm but with some slightly breezy winds in the afternoon. High temperatures will top out near the 60 degree mark, almost 20 degrees above normal.

Tonight, we will see some clouds late and overnight temperatures will dip to below freezing.

For the rest of the week, more of the same will be in store through Thursday. Friday a system gives us a glancing blow and just the slightest chance for some precipitation. Next weekend should be dry and warmer than normal. Have a look at the extended forecast here.

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Cool temps, some breezy winds for Thornton’s weekend weather

Friday, December 17th, 2021 4:58am MST

Largely typical weather for this time of year is in store for us this weekend. The three day period offers up a couple days with temps right near normal then a bit of a warm up.

For Friday, sunny skies will be above with highs in the low to mid-40s. There will be some breezy winds from late morning into the evening making it feel a bit chilly. Tonight, skies will be mostly clear and lows will be dropping into the low teens.

Saturday will offer calmer but cool conditions. Expect sunny skies with highs again in the low to mid-40s but with less wind. Saturday night, lows will be around 20 degrees under mostly clear skies.

Sunday will close things out with the warmest day of the three-day period. Highs will climb to the mid-50s under mostly sunny skies.

Have a great weekend!

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Thursday in Thornton to offer lots of sun, cool temps

Thursday, December 16th, 2021 4:53am MST

Following yesterday’s dramatic wind, today will be far calmer. Temps will remain cool but there will be plenty of blue skies above with just some breezy winds later in the day.

Clear skies start us off then a few clouds arrive later in the morning but nothing too intrusive. Overall, conditions will be calm and dry. Some breezy winds will be seen in the mid to late afternoon. High temperatures today will top out near the 50-degree mark.

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

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Very windy Wednesday ahead, cooler temps, chance for precipitation

Wednesday, December 15th, 2021 5:05am MST

Today we see temps cool down to near normal and might see just a little bit of rain or snow. Most notable however will be the wind that will have the potential to be damaging.

Mostly cloudy skies start us off and we will have just a chance to see some drops or rain, perhaps a few snowflakes until about 10:00am. Unfortunately, any precipitation is not expected to amount to much. Cloud cover will begin to ease after 10:00am. Temps today will top out in the mid-40s, right near average.

Most notable will be strong winds that will begin to develop after sunrise and peak around noon. They will then slowly taper off in the afternoon. The potential is there for winds of 40+ mph with gusts exceeding 60 mph. Those speeds that may cause damage and result in power outages, downed trees and fences, overturned vehicles, etc. Extreme caution is advised.

Additionally, with the wind and low humidity, fire danger will be elevated. A High Wind Warning and Red Flag Warning are in effect from 8:00am to 5:00pm. You can read the full text of the warnings here.

Tonight, it will remain breezy until midnight. Mostly clear skies will then be seen with overnight lows around 20 degrees.

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Tuesday starts cloudy, will see some clearing with highs above normal

Tuesday, December 14th, 2021 5:03am MST

Another mild day in Thornton although we will have a good bit of cloud cover above. Primary focus is on tomorrow’s potential for strong, damaging winds.

For today, the day starts out cloudy. Mid-morning should see the over start to break up leading to partly sunny skies this afternoon. High temperatures today will again top out in the mid to upper 50s.

Tonight, lows will dip to the mid-30s under partly sunny skies.

Looking ahead to tomorrow’s wind event, a strong pressure gradient and front will bring the potential for damaging winds with gusts to 60mph. It would be wise to spend today ensuring everything in your yard is secure.

The National Weather Service has issued a High Wind Warning that will be in effect from 8:00am to 5:00pm Wednesday. You can read the full text of the warning here.

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Mild temps, calm and dry conditions for Thornton’s Monday

Monday, December 13th, 2021 5:07am MST

More of the same as our forecast narrative largely repeats what has been said many times in recent months. Monday will bring temps well above normal with dry conditions, as has been the norm.

We will see a few clouds today but overall mostly sunny conditions will prevail. Winds will be relatively light, conditions calm and dry. High temperatures will top out about 15 degrees above normal and in the upper 50s.

Tonight, lows dip to just below freezing under partly cloudy skies.

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December 12 to December 18: This week in Denver weather history

Monday, December 13th, 2021 4:53am MST

This Week in Denver Weather History

We all know weather can be dangerous but usually we don’t associate that with winter weather conditions.  However, our look in Denver weather history for this week shows that the common winter conditions of wind and cold can not only cause injure, it can lead to death.

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.

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.

» Click here to read the rest of December 12 to December 18: This week in Denver weather history

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Thornton’s weekend starts with cold, light snow; will end with dry, mild conditions

Friday, December 10th, 2021 4:00am MST

As of this writing at 4:00am, a few flakes of snow are falling and may lead to our first measurable snowfall of the season. It won’t amount to much and the balance of the weekend will be dry with above normal temps.

For today, there just is not much moisture for the system to work with. Snow accumulations, if any, are going to be very light. Any snow should be done by about 10:00am and then we will see clearing skies. Highs today will only be in the mid-30s. Tonight, skies will be mostly clear and it will be quite cold with lows in the teens.

Saturday sees things rebound nicely with mostly sunny skies and calm, dry conditions. Highs will be in the mid to upper 40s. Saturday night, lows will be in the mid-20s under partly cloudy skies.

Sunday will be the warmest day of the three-day period. Look for highs near 60 degrees under sunny skies.

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Cool temperatures and a chance for our first measurable snow of the season Thursday

Thursday, December 9th, 2021 5:07am MST

The much-anticipated storm system is working its way to us and will arrive this evening. We do have a chance to receive our first snow of the season but it won’t amount to much and it isn’t a sure thing.

The day starts off with a mix of clouds and sun then cloud cover will be increasing. Mostly cloudy skies will settle in this afternoon. Conditions this morning will be calm then the afternoon brings some breezy winds as the front approaches. Highs today will top out in the low 50s.

Late afternoon and early evening we begin to see a chance for some rain / snow with likely only flurries until midnight. Pre-dawn tomorrow chances for snow increase and then improve around dawn Friday until mid-morning. At this time, if we receive any accumulations, they look to be quite minimal (less than a half inch).

Keep your fingers crossed!

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