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Thornton, Colorado, USA
UpdatedSun, 24-Mar-2019 9:20pm MDT 
 

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Cold front to cool things down, offer up a decent a bit of wind Wednesday

Wednesday, December 12th, 2018 5:07am MDT

An approaching cold front will mix things up for us a bit today. Temperatures will remain above normal, but a good bit cooler than yesterday, and blustery winds will be a big part of the day.

Skies start off partly clear then will see a steady increase in coverage. Mostly cloudy skies will be dominant from mid-morning on. High temperatures today will top out near the 50 degree mark.

As for the wind, look for them to begin picking up before noon then continue to increase into the evening. It won’t be until the pre-dawn hours tomorrow that they will settle down.

Tonight, skies will clear gradually with wind ongoing. Lows will be to near 20 degrees.

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December 9 to December 15: This week in Denver weather history

Wednesday, December 12th, 2018 3:40am MDT
This week in Denver weather history

December 9 to December 15: This week in Denver weather history

Heavy snow and damaging wind are at the forefront of our look back at this week in Denver weather history.

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.

7-9

In 1919…an apparent arctic cold front brought extreme cold and light snow to the city. Snowfall totaled only 2.5 inches on the 7th and 8th. Temperatures dipped to lows of 14 degrees below zero on the 8th and to 20 degrees below zero on the 9th. Both readings were daily record minimums. High temperatures were only 4 degrees on the 8th and 7 degrees on the 9th.

In 1923…a major storm dumped 13.5 inches of snowfall on downtown Denver. The apparent post-frontal snowfall started during the late afternoon of the 7th and continued through the evening of the 9th. Temperatures dipped from a high of 66 degrees on the 7th with west winds sustained to 35 mph to a low of only 14 degrees on the 9th…with north winds sustained to 25 mph.

8-9

In 1943…4.5 inches of snow fell in downtown Denver. This was the only measurable snow of the month. North winds were sustained to 26 mph on the 8th.

In 2003…snowfall totaled 3 to 6 inches across metro Denver. Snowfall was heavier in and near the foothills with 8.0 inches measured in Boulder and 10 miles southwest of Sedalia. Snowfall was 3.9 inches at the site of the former Stapleton International Airport. Most of the snow fell on the 8th…as the snow ended shortly after midnight. North winds gusted to 29 mph at Denver International Airport.

In 2008…an upslope snowstorm produced heavy snow in and near the foothills of Boulder…Jefferson and Douglas counties… And along the palmer divide south of Denver. Storm totals in the foothills ranged from 8 to 15 inches. In Boulder and in areas west and south of Denver…storm totals ranged from 6 to 13 inches. The snowfall measurement at Denver International Airport was 3.9 inches.

8-10

In 1985 a slow moving storm dumped 10 to 20 inches of snow over the northeast plains…closing schools and businesses in many areas along the Front Range north of Denver. At Stapleton International Airport…snowfall totaled 9.9 inches with a maximum snow depth of 7 inches on the ground. North winds gusted to 24 mph. The snow caused long air traffic delays at Stapleton International Airport on the 9th.

In 1997…persistent light to moderate snowfall combined with strong and gusty northerly winds to produce much blowing and drifting snow across metro Denver. The hardest hit areas were south of Denver where north winds at speeds of 20 to 35 mph with gusts to 45 mph caused near whiteout conditions. The strong winds produced drifts 2 to 4 feet deep and dropped wind chill temperatures well below zero. Sections of both I-25 and I-70 and other roads were closed as travel became impossible due to blowing snow. Numerous traffic accidents were reported and a handful of people were stranded during the snowstorm. Snowfall totals included: 22 inches at Conifer…13 inches at Castle Rock…12 inches at Parker…and 8 inches in southeast Aurora. Snowfall totaled 5.5 inches at the site of the former Stapleton International Airport. North winds gusted to 36 mph at Denver International Airport on the 10th.

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

In 1898…the very cold air mass that settled over the city behind an apparent cold front on the 7th plunged temperatures to a low of 20 degrees below zero. The high temperature climbed to only 5 degrees.

In 1910…Chinook west winds sustained to 46 mph warmed the temperature to 60 degrees…the warmest reading of the month that year.

In 1919…the minimum temperature dipped to 20 degrees below zero in downtown Denver…setting a record low for the date.

In 1984…high winds occurred in the foothills with a gust to 69 mph recorded at Golden Gate Canyon west of Denver. West winds gusted to 36 mph at Stapleton International Airport.

In 1992…high winds were recorded over most of the day in the Front Range foothills. Wind gusts to 95 mph were measured in the Table Mesa area of Boulder. Northwest winds gusted to 43 mph at Stapleton International Airport.

In 1993…a weather observer in Boulder recorded a wind gust to 73 mph. North winds gusted to 37 mph at Stapleton International Airport.

In 1998…metro Denver and areas in the foothills received the first significant snowfall in more than a month. The upslope snow event deposited up to 17 inches in the foothills with generally 4 to 8 inches across metro Denver west of I-25. Snowfall totals included 17 inches at crescent park and 16 inches in nearby Coal Creek Canyon. Other snow amounts included: 16 inches at Tiny Town; 14 inches at Chief Hosa…Evergreen…and Genesee; 13 inches in Conifer; 12 inches at Nederland; 11 inches in Eldorado Canyon; 9 inches just west of Boulder; 8 inches in Boulder; and 7 inches in Broomfield and Golden. Only 3.6 inches of snow fell at the site of the former Stapleton International Airport. Northeast winds gusted to 26 mph at Denver International Airport.

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.

» Click here to read the rest of December 9 to December 15: This week in Denver weather history

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Mild temperatures, breezy winds for Thornton’s Tuesday

Tuesday, December 11th, 2018 5:10am MDT

A passing front today will not affect our temperatures but it will offer us up some breezy winds.

The day starts with some cloud cover but that will ease this morning leading to mostly sunny skies in the afternoon. Temperatures will again be warmer than normal with highs in the mid-50s.

Look for the winds to start picking up by mid-morning, peaking by mid-afternoon before tapering off quickly. At their height, gusts to 30mph may be possible Tonight, partly clear skies will be above with lows to the upper 20s.

Keep an eye on the temps and wind with our live gauges here.

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Thornton’s workweek starts off with unseasonably warm temps, increasing clouds

Monday, December 10th, 2018 5:05am MDT

Overall temperatures thus far this month have tended to be below normal. Today we see a change that will bring warmer than normal mercury readings that should last through the week and into the weekend.

Today starts out with clear skies but high clouds will develop by mid-morning and increase in coverage. By late afternoon, skies will be partly clear.

Temperatures start out on the cold side but then will warm quickly and head toward a high in the mid-50s before cooling down in the mid-afternoon.

Tonight, skies will be mostly cloudy with lows a bit below freezing.

Looking ahead, high pressure is going to reign and should keep us mild and dry for the foreseeable future. Have a look at the entended weather forecast for more.

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Thornton to enjoy a weekend with near normal temps, calm and dry conditions

Friday, December 7th, 2018 5:04am MDT

High pressure is going to be dominant over the three-day period. That will lead to days with lots of sun and temperatures staying relatively close to normal.

For Friday, a few clouds will be around but not a tremendous amount. Temperatures will top out around 41 degrees, a couple short of average for the date. Tonight, partly clear skies will be above with lows near 20 degrees.

Saturday will be the warmest day of the period with highs in the mid to upper 40s. Look for sunny skies with calm conditions. Saturday night into Sunday morning, skies will be mostly clear with lows dipping to the low 20s.

Sunday closes out the weekend in fine fashion with lots of sun and conditions remaining calm. Highs will be the mid-40s.

Have a great weekend!

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Thornton’s Thursday to offer cold temps, a good bit of cloud cover

Thursday, December 6th, 2018 5:09am MDT

Cold air filtering down from the northwest will be a driving factor in our weather today. That will keep things chilly and moisture aloft will give us some clouds throughout the day.

We start off with mostly cloudy skies then should see some easing in the coverage before it builds again in mid to late afternoon. Temperatures today will struggle to even reach the freezing mark.

Tonight, skies will be mostly cloudy with lows near 20 degrees.

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Increased moisture above leads to more clouds Wednesday, temps remain chilly

Wednesday, December 5th, 2018 5:18am MDT

With a good bit of upper level moisture streaming in from the west, clouds will be more present today than yesterday. Temperatures will be similar, remaining chilly and a bit below normal.

Partly clear skies start things off but cloud cover will increase steadily throughout the day. Overall, mostly cloudy will be rule.

Temperatures start out quite cold then will warm toward an early afternoon high in the low 40s before starting their descent.

Tonight, mostly cloudy skies will be above and lows will dip into the teens.

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Lots of sun, chilly temps for Thornton’s Tuesday

Tuesday, December 4th, 2018 5:00am MDT

A pretty nice, late fall day ahead for us. Sunny skies above will be the rule but temps will be a bit below normal.

Clear skies start us off this morning and will continue through the day with nary a cloud to be seen throughout. Overall conditions will be calm and dry. Temperatures will top out near the 40 degree mark, a few degrees below normal.

Tonight, skies will be mostly clear with lows down to the mid-teens.

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December 2 to December 8: This week in Denver weather history

Tuesday, December 4th, 2018 4:02am MDT
This Week In Denver Weather History

December 2 to December 8: This Week in Denver Weather History

This week has historically been an extremely eventful one in Denver with many notable weather events, most of which are snow or wind related.  The most significant event occurred 99 years ago when the city received its biggest snowstorm on record – an astonishing 45.7 inches.  Details on that event and many others are below.

From the National Weather Service:

30-2

In 1975…very strong Chinook winds up to 100 mph caused damage to homes…aircraft…aircraft hangars…mobile homes… Cars…and power lines along the eastern foothills. Strong northwest winds gusted to 39 mph at Stapleton International Airport on both the 30th and the 1st.

1-2

In 1933…apparent post-frontal heavy snowfall totaled 8.0 inches across downtown Denver. North winds were sustained to 17 mph with an extreme velocity to 18 mph on the 1st.

In 1981 strong winds gusted to over 70 mph along the foothills. A peak gust to 100 mph was recorded at Wondervu. A gust to 94 mph was recorded just west of Boulder. Roofs on houses were damaged in the Evergreen area…and some mobile homes also were damaged. At Stapleton International Airport…northwest winds gusted 44 mph on the 1st and 37 mph on the 2nd.

1-5

In 1913…the 1st marked the start of the heaviest 5-day total snowfall in the city’s history. During this period snowfall totaled 45.7 inches. Starting on the 1st…snow fell intermittently for 3 days and accumulated a little over 8 inches. On the 4th and 5th…an additional 37.4 inches of snow fell. At Georgetown in the foothills west of Denver even more snow fell…86 inches over the 5 days with the most…63 inches…on the 4th.  In Colorado…snowfall was heavy along the eastern slopes of the mountains from the palmer divide north. High winds during the storm caused heavy drifting…which blocked all transportation. Snow cover of an inch or more from the storm persisted for 60 consecutive days from the 1st through January 29…1914. Additional snowfall in December and January prolonged the number of days. This is the third longest period of snow cover on record in the city.

2

In 1893…northwest winds were sustained to 42 mph with gusts to 46 mph. Snowfall was only 1.4 inches in the city.

In 1895…0.01 inch of melted snow from 0.7 inch of snowfall was the only measurable precipitation of the month in downtown Denver…ranking the month the 3rd driest December on record.

In 1899…post-frontal northeast winds sustained to 44 mph with gusts to 59 mph caused the temperature to plunge from a high of 55 degrees to a low of 15 degrees. Snowfall was only 1.0 inch.

In 1902…apparent post-frontal northwest winds were sustained to 45 mph with gusts to 53 mph. A trace of snow fell.

In 1905…only a trace of snow fell in downtown Denver. This was the only snow and precipitation for the month… Ranking the month the second driest and the second least snowiest December on record.

In 1921…snowfall was 5.5 inches in downtown Denver. Northwest winds were sustained to 24 mph with an extreme velocity of 25 mph.

In 1951…a vigorous pacific cold front produced a northwest wind gust to 51 mph at Stapleton Airport where brief blowing dust was observed.

In 1957…a strong pacific cold front produced northwest wind gusts to 54 mph at Stapleton Airport where the surface visibility was briefly reduced to 1 1/2 miles in blowing dust.

In 1977…high winds in Boulder lifted a warehouse from its foundation and ripped it apart. Wind gusts from 60 to 103 mph toppled and injured a man while walking. Winds were clocked to 104 mph at Nederland…100 mph at Morrison…and 62 mph at Rocky Flats. Northwest winds gusted to 41 mph at Stapleton International Airport.

In 1996…for the second day in a row high winds ripped the Front Range foothills. Winds gusted to 81 mph in Golden Gate Canyon. West-northwest winds gusted to 37 mph at Denver International Airport.

In 2013…high winds developed ahead of an approaching storm system. The strong winds downed several trees around Evergreen. Peak wind gusts included: 79 mph…4 miles west-southwest of Eldorado Springs; 78 mph…3 miles south of Evergreen; 75 mph and the NCAR Mesa Lab; and 69 mph in Longmont.

» Click here to read the rest of December 2 to December 8: This week in Denver weather history

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November 2018 weather recap: Chilly temps, not much moisture

Tuesday, December 4th, 2018 1:59am MDT

Thornton’s month of November saw us get a real taste of what is to come for the next few months. Temperatures cooled considerably and we saw a decent bit of snow although not as much as normal.

The first five days of the month started out relatively mild but then we saw a series of systems interrupt the calm.  Temperatures turned colder and on the 11th and 12th we received a nice little snowfall. We briefly warmed up then saw some light rain on the 18th and 19th and then once again warmed back up. The month closed out with a chilly day and some light snow.

Thornton saw an overall average temperature for the month of 36.8 degrees. This was a good bit colder than Denver’s long term average for the month of 38.3 degrees. Out at DIA where Denver’s official measurements are taken, it was a good bit warmer with an average of 37.8 degrees.

Temperatures for us ranged from a high of 64.7 degrees on the 2nd of the month down to a cold low of 15.7 degrees on the morning of the 26th.  Denver’s high of 65 degrees on the 2nd matched ours but their coldest reading of 10 on the 12th was notably colder than our lowest reading.

November’s long term precipitation average in Denver is 0.61 inches.  Thornton managed about half that in our bucket with 0.31 inches with Denver close to us at 0.35 inches.

Snowfall was respectable but not notable. Thornton recorded 6.3 inches of the white stuff while Denver, as usual, lagged with 4.5 inches. Both measurements were below Denver’s long term November average of 8.7 inches.

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

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

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

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

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

CLIMATE REPORT
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
929 AM MST MON DEC 3 2018

...................................

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF NOVEMBER 2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2018

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              81   11/27/2017
 LOW              -18   11/29/1877
HIGHEST            65   11/02        73      -8       81  11/27
LOWEST             10   11/12        -6      16       22  11/15
                                                          11/12
AVG. MAXIMUM     50.6              52.1    -1.5     61.1
AVG. MINIMUM     25.0              24.5     0.5     29.4
MEAN             37.8              38.3    -0.5     45.3
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      2               2.3    -0.3        0
DAYS MIN <= 32     27              23.4     3.6       22
DAYS MIN <= 0       0               0.6    -0.6        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.21   1946
 MINIMUM            T   1899
                        1901
                        1949
TOTALS           0.35              0.61   -0.26     0.29
DAILY AVG.       0.01              0.02   -0.01     0.01
DAYS >= .01         6               4.7     1.3        3
DAYS >= .10         1               1.6    -0.6        1
DAYS >= .50         0               0.0     0.0        0
DAYS >= 1.00        0               0.0     0.0        0
GREATEST
 24 HR. TOTAL    0.17   11/11 TO 11/11           11/17 TO 11/17

SNOWFALL (INCHES)
RECORDS
TOTAL             4.5               8.7
RECORD NOVEMBER  42.5  1946

DEGREE_DAYS
HEATING TOTAL     808               801       7      586
 SINCE 7/1       1373              1382      -9     1171
COOLING TOTAL       0                 0       0        0
 SINCE 1/1       1026               769     257      881

FREEZE DATES
RECORD
 EARLIEST     09/08/1962
 LATEST       06/08/2007
EARLIEST                        10/07
LATEST                          05/05
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              9.8
RESULTANT WIND SPEED/DIRECTION   2/225
HIGHEST WIND SPEED/DIRECTION    48/330    DATE  11/24
HIGHEST GUST SPEED/DIRECTION    62/320    DATE  11/24

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR            8
NUMBER OF DAYS PC             16
NUMBER OF DAYS CLOUDY          6

AVERAGE RH (PERCENT)     56

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORMS             0      MIXED PRECIP       0
HEAVY RAIN                0      RAIN               0
LIGHT RAIN                2      FREEZING RAIN      0
LIGHT FREEZING RAIN       1      HAIL               0
HEAVY SNOW                0      SNOW               3
LIGHT SNOW                9      SLEET              0
FOG                       8      DENSE FOG          2
HAZE                      2

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.
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