Thornton, Colorado, USA
UpdatedWed, 25-Apr-2018 5:40pm MDT 


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Saturday cools down but will still offer warmer than normal temps

Saturday, November 25th, 2017 5:32am MDT

Following the passage of the cold front yesterday, we see high temperatures cool down about 10 degrees today. However, even then the mercury will be well above average for the date.

We start off with some cloud cover early but then will see that erode and by late morning sunny skies will be the rule. Winds will be light and out of the west.

In terms of temperatures, highs today will top out in the low 60s. Average for the date is 48 degrees.

Tonight, skies will be partly clear and overnight low temperatures dip to the mid to upper 30s.

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Weather Geek Stuff for the weather enthusiast on your shopping list

Friday, November 24th, 2017 3:39pm MDT

Weather Geek Stuff is a great place to shop for gifts for weather enthusiasts, weather geeks and weather lovers.

Not everyone gets excited about blizzards, tornadoes, hurricanes and other types of extreme weather but many folks out there are passionate about Mother Nature.  Weather Geek Stuff is an online shop just for those whose hearts race with the thrill of severe weather and they are offering special deals through the holiday season.

Weather Geek Stuff is an online store that provides a host of clothing items and novelties just for weather buffs.  From the store’s custom ‘Weather Geek’ and ‘Weather Diva’ logoed merchandise to items imprinted with amusing weather warnings signs as well as Skywarn storm spotter logos, there is something there sure to please any weather lover.

Weather Geek Stuff’s merchandise was shown on the Weather Channel as a recommended gift so you know the quality is good.  Stu Ostro, Weather Channel’s Senior Director of Weather Communications even sports a ‘Weather Geek’ t-shirt on his Twitter profile.

Kids and dogs aren’t left out of the weather fun either.  There is a wide variety of clothing items sized just right for the little ones from babies to bigger kids.  Canine companions as well can get shirts and bowls emblazoned with a weather-related logo.

The selection goes far beyond clothing too.  Water bottles, clocks, mugs, bags and other novelties are part of the store’s offerings.  For the tech types, cases for iPhones and iPads are available.  Recently added products include laptop skins, clipboards and throw blankets.

Be sure to head over to WeatherGeekStuff.com and get that holiday gift today for your favorite weather geek. 

Support ThorntonWeather .com

Weather Geek Stuff is owned and operated by the same folks that run ThorntonWeather.com.  We provide ThorntonWeather.com as a no-cost service to the community and use the minimal amount of money made from Weather Geek Stuff to support the costs of running this website and the associated equipment.  So remember, if you have a weather buff on your shopping list, by buying from Weather Geek Stuff you are supporting ThorntonWeather.com!  You can also donate directly to fund the site here.

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Black Friday to offer unseasonably warm temps, breezy winds

Friday, November 24th, 2017 5:12am MDT

If you are heading out to brave the shopping crowds today, you won’t have any problems from Mother Nature. She has given us another day with temps well above normal although we will see some breezy winds.

The day starts under mostly sunny skies then by late morning into the afternoon a few more clouds arrive. We will see downslope winds out of the northwest that are breezy at times, particularly in the afternoon. Temperatures will be quite mild with highs in the mid to upper 60s.

Tonight, winds will ease and skies clear some. The mercury will dip to overnight lows in the mid-30s.

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Potentially record-setting warmth for Thornton’s Thanksgiving

Thursday, November 23rd, 2017 6:12am MDT

A very mild day ahead for our holiday. We will enjoy mostly sunny skies, calm and dry conditions and mercury readings that may set records.

The day starts with mostly sunny skies and those will stick with us until late afternoon when a few more clouds will arrive. Winds will be out of the west and relatively light until the overnight hours.

In terms of temperatures, we are expecting a high temperature this afternoon of 73 degrees. That is also the record high temperature for November 23rd set in 1915. Additionally, Denver’s warmest Thanksgiving Day (1909) saw a high reading of 73 degrees as well. It is quite possible those records will be tied or even fall. Much will depend on the impact of any cloud cover.

Tonight, winds will be a bit breezy under partly cloudy skies. Lows will dip to the low 40s.

We wish you a very happy Thanksgiving! You can keep an eye on current temperatures here.

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Wednesday warms up with a good bit of cloud cover, some wind

Wednesday, November 22nd, 2017 5:05am MDT

We are going to close out the workweek in pretty decent fashion today. Temperatures bounce right back to well above normal levels but we will see some clouds and some breezy winds.

The day starts off with partly sunny skies and we expect to see similar, high cloud cover throughout the day. Temperatures should top out in the mid-60s although those clouds may inhibit the forecast highs by a couple of degrees. Winds will be light initially then pick up a bit in the afternoon.

Tonight, skies will clear after midnight and overnight lows dip to the upper 30s.

Looking ahead to the Thanksgiving holiday, it looks to be a very mild one with plenty of sun and highs over 70 degrees. Details in the extended forecast.

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Cold front to usher in cooler temperatures, slight chance for showers

Tuesday, November 21st, 2017 4:59am MDT

A bit of a change Tuesday in the weather pattern of recent days. A cold front will be moving through that will offer up a slight chance for a few drops of rain and bring temperatures down close to normal.

The day starts off with some breezy winds and mostly cloudy skies. We will see a good bit of cloud cover until mid-morning when coverage will then begin to gradually ease. As the front pushes toward us early this morning, a few sprinkles of rain will be possible through the morning hours.

In terms of temperatures, it will remain cool this morning until the front passes then we should warm up some with highs today topping out right near the average high for the date of 49 degrees.

Tonight, partly cloudy skies will be above and lows dip to within a couple of degrees of freezing.

Looking ahead, unseasonably warm temperatures return for the balance of the week. Get a look at the extended forecast here.

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Pacific Northwest May Be at Most Risk for the ‘Big One’

Tuesday, November 21st, 2017 3:15am MDT

The next big earthquake is due in the Pacific Northwest—but now scientists have pinpointed where along the coast a large earthquake is most likely to happen, according to a study published Monday. “We observed very compact sediments offshore of Washington and northern Oregon that could support earthquake rupture over a long distance and close to the trench, which increases both earthquake and tsunami hazards,” lead author of the study Shuoshuo Han,… » Click here to read the rest of Pacific Northwest May Be at Most Risk for the ‘Big One’

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Solar System’s First Interstellar Visitor Dazzles Scientists

Monday, November 20th, 2017 6:22pm MDT

Artist’s concept of interstellar asteroid 1I/2017 U1 (‘Oumuamua) as it passed through the solar system after its discovery in October 2017. The aspect ratio of up to 10:1 is unlike that of any object seen in our own solar system. » Click here to read the rest of Solar System’s First Interstellar Visitor Dazzles Scientists

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November 19 to November 25: This week in Denver weather history

Monday, November 20th, 2017 5:22am MDT
This Week In Denver Weather History

November 19 to November 25: This week in Denver weather history

With the Thanksgiving holiday approaching, travelers cast a wary eye on Denver’s weather and in our look back at this week in Denver weather history we see they have had cause for concern in the past. Snowstorms and wind have caused their share of problems. Also notable, it was 140 years ago that Denver’s first official weather observation occurred.

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From the National Weather Service:


In 1975…snowfall totaled only 5.5 inches and north winds gusted to 35 mph causing some blowing snow at Stapleton International Airport…while a major blizzard struck southeastern Colorado.

In 1985…4 to 7 inches of snow fell across metro Denver. Snowfall totaled 4.4 inches at Stapleton International Airport where north winds gusted to 23 mph.

In 1991…another strong winter storm produced heavy snow over metro Denver. Snowfall totaled 9.5 inches at Stapleton International Airport with 9 inches at Parker… And 8 inches in southeast Denver…Morrison…and Wheat Ridge. This second storm brought the 5 day (15th-19th) snowfall total at Stapleton International Airport to 21.1 inches. The greatest depth of snow on the ground was 13 inches on the morning of the 19th. The adverse effects of the two storms were diminished by the lack of significant winds.


In 1930…a major storm dumped a total of 13.6 inches of snowfall over downtown Denver. Most of the snow…9.4 inches…fell on the 19th when north winds were sustained to 23 mph. This was the only measurable snow of the month. Temperatures hovered in the 20’s and lower 30’s.

In 1956…an intense winter storm dumped 12.8 inches of snowfall on metro Denver. Strong north-northeast winds gusting to 33 mph at Stapleton Airport frequently reduced the visibility to 1/2 mile in snow and blowing snow on the 19th. Most of the snowfall…10.7 inches…occurred on the 19th.


In 1931…the first measurable snow of the season totaled only 1.0 inch in the city.

In 1977…near-blizzard conditions caused some traffic accident injuries across metro Denver. Only 1.3 inches of snow fell at Stapleton International Airport where northeast winds gusted to 28 mph.


In 1979…a heavy snowstorm buried most of Colorado under at least a foot of snow. Snowfall at Stapleton International Airport totaled 17.7 inches…the greatest snow depth since 1946. Winds to 60 mph produced 5-foot drifts paralyzing the city as temperatures hovered in the 20’s. While small airports closed…Stapleton remained open…but with long delays that snarled thanksgiving holiday traffic. Schools and businesses closed and postal deliveries were delayed. Almost all major highways leading out of Denver were closed to traffic for periods of time on the 20th and 21st. Most of the snow…13.5 inches…fell on the 20th. At Stapleton International Airport…north winds gusted to 35 mph on the 20th and to 38 mph on the 21st.


In 1871…the first official weather observation in Denver… Was taken by Henry Fenton…observer sergeant of the united states army signal service at 5:43 am. The office was located on the 2nd floor of a building at the corner of Larimer and g streets…now 16th street. The daily weather journal hand written entry for the day follows: “Snow fell heavily during past night. At 5:43 am it was snowing light and continued until 8 am. Wind during snow storm gentle and a little west of south…and continued there during the remainder of the day. Sky clear after 8 am. Very cold weather prevailed all day and night. Thermometer at 9:43 pm 14 degrees. Rain gauge and self-registering thermometer not in position owing to severe storm last week. Barometer falling during the morning and rising rapidly at night.”

In 1894…northwest Chinook winds sustained to 40 mph with gusts to 45 mph warmed the temperature to a high of 58 degrees in the city.

In 1909…steady and very strong winds in Boulder caused 3 thousand dollars in damage.

In 1915…post-frontal northeast winds sustained to 40 mph with gusts as high as 42 mph produced only a trace of snow. It was windy most of the day.

In 1923…west winds were sustained to 42 mph with gusts to 44 mph before daybreak. The strong winds persisted in the city for only about 3 hours.

In 1993…a wind gust to 72 mph was recorded at Table Mesa in southwest Boulder.

In 1994…winds gusted to 77 mph atop Squaw Mountain west of Denver. West winds gusted to 40 mph at Stapleton International Airport.


In 1898…snowfall totaled 4.0 inches in downtown Denver. Northeast winds were sustained to 48 mph with gusts as high as 60 mph behind an apparent cold front on the 20th… When temperatures plunged from a high of 66 degrees to a low of 9 degrees. On the 21st the high was only 24 degrees and the low was 2 degrees.

In 1970…a wind gust to 94 mph was recorded at gold hill in the foothills west of Boulder. Strong winds also swept across metro Denver. Wind gusts reached 59 mph in downtown Boulder…while at Stapleton International Airport west- northwest winds gusted to 43 mph on the 21st. Damage was minor.

In 1992…a large Canadian air mass moved into the state at the same time an upper level storm system approached from the west. The combination of cold air at the surface and very moist air aloft produced heavy snow across the entire state. Snowfall totaled 6.3 inches at Stapleton International Airport…where north winds gusted to 23 mph on the 20th. Snow was heavier in the foothills…with 14 inches at Wondervu…13 inches at Aspen Springs…Conifer… Boulder…and Gross Reservoir…8 inches at Rollinsville… And 10 inches at Golden Gate Canyon and Morrison.

In 2007…a storm system brought moderate to heavy snowfall to portions of the urban corridor. Storm totals included: 7 inches…3 miles south-southeast of Fort Collins…with 6 inches in Boulder and at Horsetooth Inlet Bay. Elsewhere… Storm totals ranged from 2 to 5 inches. Snowfall totaled 2.0 inches at the site of the former Stapleton International Airport.


In 1891…northwest winds were sustained to 50 mph with gusts to 60 mph.

In 1899…a trace of snow fell in the city. This…together with a trace of precipitation on the 16th and 23rd…was the only precipitation of the month…making the month the driest on record. The record was equaled in November of 1901 and 1949. This trace of snow along with a trace of snow on the 23rd was the only snow of the month…ranking the month the 2nd least snowiest on record. This record was equaled in November of 1884…1901…1905…1917…and 1939.

In 1900…west winds were sustained to 46 mph with gusts to 54 mph. The Chinook winds warmed the temperature to a high of 64 degrees.

In 1934…the latest date for the first measurable snow of the season occurred. This was not the first snow of the season… Because traces of snow had fallen earlier in September. Snowfall totaled only 1.0 inch over downtown Denver.

In 1962…strong west-northwest Chinook winds gusted to 53 mph at Stapleton Airport.

In 1998…an intense mountain wave allowed for high winds to develop in the foothills of Boulder County. Wind gusts as high as 77 mph were measured 3 miles east- northeast of Nederland.


In 1905…a trace of snow fell on both days in downtown Denver. This was the only snow of the month…ranking the month along with other Novembers…the 2nd least snowiest on record.

In 1999…the first significant snowfall of the season struck metro Denver. Snowfall totals included: 16 inches near Bailey; 13 inches near Evergreen; 12 inches at north turkey creek…Genesee…near Morrison…and near Sedalia; 11 inches near Conifer and in Evergreen; 10 inches in Louisville; 9 inches in Brighton…Broomfield…and Denver; and 8 inches at Arvada…Castle Rock…and Eldorado Springs. Snowfall totaled 8.4 inches at the site of the former Stapleton International Airport.

In 2003…heavy snow fell in and near the foothills of Boulder County. Snowfall totaled 10.5 inches in Eldorado Springs. Across the city…snowfall was lighter with 2.8 inches measured at the site of the former Stapleton International Airport on the 22nd. North winds gusted to 32 mph at Denver International Airport on the 22nd.

» Click here to read the rest of November 19 to November 25: This week in Denver weather history

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Mild temperatures, breezy winds start Thornton’s short workweek

Monday, November 20th, 2017 5:06am MDT

Monday will offer up unseasonably warm temperatures. However, those temperatures will be driven by warming, downslope winds that will put a bit of a damper on things.

The day starts with mostly sunny skies to be followed by an increase in cloud coverage later this morning leading to partly sunny skies. The pre-dawn hours saw winds pick up and already drive the thermometer higher. That gives us a head start on our expected high temperature today of 66 degrees. Winds will be breezy in the morning then gain some steam in the afternoon and last into the evening before tapering off overnight.

Tonight look for partly clear skies with lows in the mid-30s.

Keep an eye on those windspeeds here.

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