Thornton, Colorado, USA
UpdatedFri, 20-Oct-2017 3:25pm MDT 


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Near normal temps, chance for PM storms for Thornton’s Thursday

Thursday, October 5th, 2017 5:31am MDT

Following a foggy start, our day today looks to be a pretty decent one with largely seasonal temps and then a chance for storms. The main focus in our weather future though is a system set to arrive Monday that may bring our first accumulating snow of the season.

For today, areas of fog will be seen, dense in spots, and as such a Dense Fog Advisory is in effect until 9:00am. Be sure to be careful as you encounter these areas on the road. Not long after sunrise the fog will begin to burn off and we will see partly sunny skies for most of the morning. That will be followed by some easing of cover in the late morning / early afternoon then an increase again in the evening.

Temperatures today will be topping out in the mid to upper 60s. Late afternoon brings slight chances for some showers and thunderstorms with the best opportunity coming after 6:00pm.

Some shower activity may persist in the overnight hours. Look for nighttime lows tonight to dip to around 50 degrees.

Looking ahead, Friday will be cooler with chances for showers. Then we are set to enjoy a mild, dry weekend.

The biggest thing we are watching is a deep trough and associated cold front set to arrive sometime in the late Sunday / Monday timeframe. Models are in pretty good agreement on this system and should they hold true, it is likely we will see our first shot of snow for the season here along the Front Range.

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Thornton’s October weather preview: Fall arrives in earnest, tastes of winter

Wednesday, October 4th, 2017 5:07am MDT

Thornton, Colorado October weather preview.With the first full month of fall here, October usually brings one of the quietest weather months in the Denver area with plenty of mild, sunny days and clear, cool nights.

October is historically the second sunniest month and conditions are generally calm.

However we also will usually see our first taste of winter during the month with the first freeze and first snowfall of the season.

Temperatures as well will start to drop and by the end of the month the average nighttime lows are below freezing.

For complete details on our historical October weather and what we can expect in the coming month, read our complete October weather preview here.

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Wednesday offers seasonal temperatures, slight chance for storms

Wednesday, October 4th, 2017 5:00am MDT

A welcome bit of warmer temperatures on tap for Thornton today. Highs will be near normal and we see just a slight chance for a PM thunderstorm.

Partly cloudy skies start of the day and will be with us this morning. Late morning and early afternoon should bring a bit of clearing. We see just a slight chance for an isolated thunderstorm or two after about 3:00pm lasting into the evening. Highs today will top out in the upper 60s, close the average for the date of 70 degrees. Looks for skies to clear some tonight with overnight lows around 48 degrees.

Keep an eye out for any storms here.

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Cool but dry conditions for Thornton’s Tuesday

Tuesday, October 3rd, 2017 5:14am MDT

Definitely a chill in the air to start the day today as we saw our first Frost Advisory of the season. We will warm up today but with temps remaining a good ways below normal.

Mostly sunny skies will be the general rule of thumb today with varying degrees of cloud coverage. We are starting out quite chilly and the Frost Advisory remains in effect until 9:00am. Look for the mercury to climb to a high in the mid to upper 50s. Overall conditions will be calm.

Tonight clouds will increase and we will see lows in the low to mid-40s.

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Thornton’s workweek starts with a return to cool, wet conditions

Monday, October 2nd, 2017 5:04am MDT

This weekend brought us a break from the unsettled weather but that has ended and today we get right back to weather like we had much of last week.

The day starts off with cloudy skies and areas of light rain. Look for that to generally continue throughout the day and into the evening. The afternoon periods may see a bit of an increase in activity, perhaps with a bit of thunder to go with it.

Winds will become breezy in the afternoon and out of the north. Temperatures will be much cooler than normal today with highs around the 50 degree mark.

Look for the rain to end by around midnight tonight to be followed by some clearing. Overnight lows will be around 40 degrees.

Keep an eye on the showers with our interactive radar here.

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October 1 to October 7: This week in Denver weather history

Sunday, October 1st, 2017 6:07pm MDT
This Week In Denver Weather History

October 1 to October 7: This week in Denver weather history

October is usually a relatively calm weather month in Denver but can see some interesting events. In our look back at this week in Denver weather history we see tornadoes, damaging wind and of course snow.

From the National Weather Service:


In 1959…heavy snowfall totaled 5.9 inches at Stapleton Airport. Winds were light.


In 1892…the highest temperature ever recorded in October… 90 degrees…occurred. This is also the latest 90 degree reading of the season.

In 1898…southwest winds were sustained to 40 mph with gusts to 49 mph in the city.

In 1927…a trace of snow was the only snow of the month… Ranking the year…amongst several other years…the second least snowiest on record.

In 1971…a wind gust to 90 mph was recorded at Buckley Field in Aurora. The severe winds caused damage in northeast metro Denver. A brick wall of a bowling alley was blown down…the roof was blown off a garage…and some business signs were damaged. A man in the bowling alley was injured by flying glass. Northwest winds gusted to 43 mph at Stapleton International Airport.

In 1994…unusually strong thunderstorms for so late in the season pummeled metro Denver with large hail. The largest hail…2 inches in diameter…fell at Buckley Field. Hail 1 3/4 inches in diameter fell 7 miles northeast of Boulder and at Niwot. Hail 3/4 to 1 1/2 inches in diameter fell in Boulder…Arvada…Wheat Ridge…Edgewater…capitol hill and northwest Denver…Bennett…and Strasburg. Hail of unknown size damaged a Boeing 737 aircraft and injured both pilots at Stapleton International Airport when the windshield was broken out on takeoff. Half inch diameter hail fell at Stapleton International Airport where northwest winds gusted to 40 mph and rainfall totaled 0.82 inch.

In 2014…severe thunderstorms produced wind gusts to 60 mph across parts of Arapahoe and Denver Counties.  The intense wind gusts downed trees and power lines which caused a power outage near the Denver Technology Center.  At Denver International Airport…a peak wind gust to 37 mph was measured from the northwest.


In 1903…southwest winds were sustained to 42 mph with gusts as high as 60 mph. The strong Chinook winds warmed the temperature to a high of 78 degrees.

In 1910…an apparent dry microburst produced sustained northeast winds to 43 mph.

In 1934…a trace of rain was the only precipitation of the month. This was the driest October on record.


In 1875…very dense haze hid the mountains from view as observed from the city.

In 1933…rainfall of just 0.01 inch was the only precipitation of the month. This was the second driest October on record.

In 1954…the low temperature cooled to only 60 degrees…the all-time record high minimum for the month October.


In 1969…the first snowfall of the season totaled 16.0 inches at Stapleton International Airport. There was a thunder snow shower on the evening of the 3rd…but otherwise little wind with the storm. The greatest snow depth on the ground was 8 inches due to melting. Heavy wet snow accumulated on trees…which were still in full leaf…and caused widespread damage from broken limbs and downed utility lines.


In 1984…the remnants of pacific hurricane Polo produced heavy rain over northeastern Colorado. Most locations received between 1.00 to 2.50 inches of rain…but 3.45 inches fell in Littleton. Rainfall totaled 1.73 inches at Stapleton International Airport…where north winds gusted to 24 mph.

4 » Click here to read the rest of October 1 to October 7: This week in Denver weather history

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Weekend to bring drier and warmer weather conditions

Friday, September 29th, 2017 5:04am MDT

Just in time for the weekend, Mother Nature offers us a reprieve from the cool, damp weather of recent days. We will still have some chances for storms but they should be less dominate and temperatures will warm.

For Friday, partly sunny skies will be above throughout the day. A few light showers will still be possible, perhaps with some thunder in the mix later this afternoon and evening. Temperatures will top out in the mid-60s. Tonight, partly clear skies will be above with overnight lows in the mid-40s.

Saturday looks to be a pleasant fall day. Mostly sunny skies will be above with a slight chance for some PM thunderstorms. Highs will be at or just above the 70 degree mark. Saturday night into Sunday morning, skies will be partly clear with lows in the mid to upper 40s.

We close out the weekend on Sunday with a good dose of sun and calm conditions. Mostly sunny skies will be above with highs right near 70 degrees.

Have a great weekend!

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More than 120,000 flee rumbling Bali volcano

Thursday, September 28th, 2017 5:43pm MDT

More than 122,000 people have fled their homes on the resort island of Bali, fearful that a rumbling volcano could erupt at any time, disaster officials said. Mount Agung, 75 kilometres (47 miles) from the resort hub of Kuta, has been shaking since August and threatening to erupt for the first time since 1963 — a… » Click here to read the rest of More than 120,000 flee rumbling Bali volcano

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September 24 to September 30: This week in Denver weather history

Thursday, September 28th, 2017 9:14am MDT
This Week In Denver Weather History

September 24 to September 30: This week in Denver weather history

Colorado’s famously inconsistent weather can be seen in our look back at this week in Denver weather history. Not only do we see damaging thunderstorms and winds but even major snowstorms that deposited more than a foot of the white stuff on the city.

From the National Weather Service:


In 2000…the first snowstorm of the season brought heavy snow to areas in and near the foothills. While the heaviest snow fell north of metro Denver…6 inches were measured in Boulder…4 inches at both Castle Rock and Morrison…but only 0.2 inch at the site of the former Stapleton International Airport where most of the precipitation fell as rain. At Denver International Airport where drizzle and rain fell on the 23rd… Snowfall during the early morning of the 24th was estimated at 2.1 inches due to melting. The foothills west of Denver received more snow with 10 inches measured at conifer…9 inches 11 miles southwest of Morrison… 8 inches atop Crow Hill…7 inches at Chief Hosa…and 5 inches at Ralston Reservoir.


In 1901…northwest winds were sustained to 50 mph with gusts as high as 57 mph in the city.

In 1932…thunderstorm rainfall of only 0.11 inch was the only measurable precipitation for the month that year in the city.

In 1986…a very strong wind storm roared across metro Denver. Boulder was hit hardest. Winds peaked to 131 mph at the National Center for Atmospheric Research. This is thought to be the highest wind gust ever recorded in Boulder during September. A wind gust to 118 mph was clocked on Davidson Mesa and to 92 mph near Niwot. Gusts of 70 to 80 mph were common over all of Boulder where an estimated 70 to 90 large trees were uprooted. About a dozen of them hit cars. Two walls of a building under construction were toppled and solar panels were blown off a house. Traffic lights and power lines were downed. Damage to power equipment alone was estimated at 100 thousand dollars. Wind gusts to 87 mph at Jefferson County Airport damaged two planes. A woman was seriously injured in Boulder. She suffered a fractured skull when struck by a falling tree limb. Trees were also downed in Louisville and Lafayette. West wind gusts to 45 mph were recorded at Stapleton International Airport.


In 1873…a fire was sighted in the woods near Platte Canyon… Probably caused by high winds blowing sparks among the timber.

In 1896…an apparent cold front produced northeast sustained winds to 40 mph with gusts to 48 mph.

In 1910…a thunderstorm produced sustained north winds to 51 mph. This was the highest recorded wind speed in the city in September at the time.

In 1936…a vigorous cold front produced a deadly dust storm in the city. North winds sustained to 36 mph with gusts to 38 mph produced much blowing dense dust…greatly restricting the visibility. The temperature plunged from a high of 84 degrees to a low of 38 degrees by midnight. The weather observer described the event with the following. “at 6:00 pm the temperature was 82 degrees and the wind velocity was only 4 mph; but with the wind shifting to the north and the barometer rising quite rapidly…the temperature fell sharply. By 6:30 pm…the wind velocity increased rapidly and by 7:00 pm had reached a maximum sustained velocity of 36 mph…bringing with it clouds of dust which had been picked up by gale force winds in southern Wyoming and northern Colorado…covering the city. The visibility was generally reduced to about 1/4 mile; however…the whirling of the dust down the streets and alleys…the visibility was at times somewhat less. Airplanes were grounded…traffic was halted at times…and homes filled with dust. The strong winds damaged electric power and telephone lines…leaving homes in darkness for a few hours in the city and for 18 hours in suburban towns and putting 2500 telephones out of service because of broken lines. An electric lineman was killed while repairing damage by the high winds. The dust storm was followed by rain that began falling at 10:55 pm…which turned to snow during the early morning hours of the 26th. A major snow storm followed on the 27th through the 29th.”

In 1999…high winds developed in the foothills of Boulder County. Winds gusted to 90 mph at Wondervu.


In 1908…apparent post-frontal rain changed to snow overnight and totaled 6.5 inches in downtown Denver. This was the first snow of the season. Precipitation totaled 0.76 inch. North winds were sustained to 39 mph on the 25th.


In 1996…an early season snowstorm brought heavy snow to the Front Range eastern foothills. Snowfall totals included: 8 to 12 inches around conifer…7 inches on Floyd Hill…and 6 inches at both Bailey and Chief Hosa. Snowfall totaled only 4.7 inches at the site of the former Stapleton International Airport. This was the first measurable snow of the season. After the passage of a strong cold front…north winds gusted to 38 mph at Denver International Airport on the 25th.

» Click here to read the rest of September 24 to September 30: This week in Denver weather history

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Thornton’s Thursday starts wet, showers then to ease, temps remain cool

Thursday, September 28th, 2017 5:03am MDT

A very wet morning out there as rain has been falling since midnight. We will see that start to come to an end this morning but it will remain cloudy and cool.

Cloudy skies start off the day and are expected to remain with us throughout the daytime hours. The rain will continue through mid-morning or so then begin to ease this morning as shower activity shifts to the northeast. Temperatures will again be much cooler than normal with highs in the mid to upper 50s.

Tonight there may be a few drops of rain but otherwise we will see some clearing begin. Lows tonight will be in the mid-40s.

Keep an eye on the showers here.

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