Thornton, Colorado, USA
UpdatedSun, 24-Mar-2019 10:00pm MDT 


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Daylight Saving Time to end as we ‘fall back’ on Sunday, November 4

Thursday, November 1st, 2018 4:32pm MDT
The United States returns to Standard Time at 2:00am Sunday as Daylight Saving Time comes to an end.

The United States returns to Standard Time at 2:00am Sunday as Daylight Saving Time comes to an end.

The biannual ritual of changing our clocks to adjust for Daylight Saving Time occurs this weekend, providing yet another signal of the changing of seasons.  The United States will ‘fall back’ one hour at 2:00am Sunday morning as we return to Standard Time.

The ritual of changing our clocks twice a year can be met with some resistance as some people struggle to adjust their body’s internal clock.  Others actually like the return to standard time as they get to enjoy an extra hour of sleep.

The time change definitely has big effects on the dawning of daylight and how early it gets dark in the evening.

Sunrise on Saturday occurs at 7:30am but on Sunday it will be at 6:32am. Similarly, sunset will occur at 5:55pm on Saturday but on Sunday the sun will disappear over the horizon at 4:54pm.

For many this means that when they get home from work it will now be dark and outdoor activities will be significantly curtailed as a result.

Arizona and Hawaii are the only states that do not observe Daylight Saving Time and remain on Standard Time year round.    The U.S. territories of Puerto Rico, American Samoa, Guam, Northern Mariana Islands, and the United States Virgin Islands also do not observe the event.

It won’t be all that long though before Daylight Saving Time returns.  On March 11, 2018 we will ‘spring forward.’

Daylight Saving Time Schedule

The mandated beginning and end of Daylight Saving Time has changed in the United States over the years.

The most recent schedule was set by the Energy Policy Act of 2005 and took effect in 2007.  We now ‘spring forward’ to begin Daylight Saving Time on the second Sunday in March and ‘fall back’ with the return to Standard Time on the first Sunday in November.
Daylight Savings Time Schedule

Year DST Begins 2 a.m.
(Second Sunday in March)
DST Ends 2 a.m.
(First Sunday in November)
2018 11 March 2018 4 November 2018
2019 10 March 2019 3 November 2019
2020 8 March 2020 1 November 2020
2021 14 March 2021 7 November 2021
2022 13 March 2022 6 November 2022
2023 12 March 2023 5 November 2023
2024 10 March 2024 3 November 2024
2025 9 March 2025 2 November 2025
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Near normal temps, breezy winds for Thornton’s Thursday

Thursday, November 1st, 2018 4:53am MDT

The chill and wet of yesterday have moved out and in its wake we will warm back to near normal. A weak system though will keep some cloud cover and offer up breezy PM winds.

The day starts with partly clear skies and as the morning progresses, some of the clouds will clear before building back up in the afternoon. Temperatures will top out in the mid-50s, near but shy of the average high for the date of 59 degrees. Winds will become breezy and out of the northwest, particularly from mid-afternoon into the evening.

Tonight, skies will be partly clear with lows in the mid-30s.

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Thornton’s Halloween to see skies clear, conditions dry, remain cool

Wednesday, October 31st, 2018 4:59am MDT

Well, the snow didn’t quite pan out as planned but we did receive some much-needed moisture (nearly a quarter of an inch). Today we dry out and will see a return of the sun before things get a bit chilly for those trick-or-treaters.

The day starts out with mostly cloudy skies and the rain has ended. Gradual clearing will be seen this morning leading to mostly sunny skies by later this morning.

Temperatures start out cold but then will see some improvement with highs today in the upper 40s. This evening, a weak system leads to increased clouds. Look for temperatures in the lower 40s dropping to the upper 30s when the kids are knocking on doors.

Overnight lows tonight will be near the freezing mark.

Get real time weather conditions here.

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October 2018 top shots: Monthly photo slideshow

Wednesday, October 31st, 2018 3:45am MDT
A gorgeous sunrise as seen at the Rocky Mountain Arsenal kicks off the second day of the month. (Bill Hutchinson)

A gorgeous sunrise as seen at the Rocky Mountain Arsenal kicks off the second day of the month. (Bill Hutchinson)

October in Thornton can bring a wide variety of weather conditions, perfect for the photographer in all of us.

The month brings the changing of the colors at Colorado’s lower elevations and it is also is typically when we see our first freeze and first snow.

Couple those facts with our usual widely varying landscapes and wildlife and we have a month that is sure to bring in plenty of photo opportunities.

  • Slideshow updated October 31, 2018
  • To learn more about how to send your photo to us for inclusion in the slideshow, see below the slideshow.

Showcasing images captured by ThorntonWeather.com readers as well as some of our own, our monthly slideshow covers the entire gamut of weather-related imagery.

Sunsets, sunrises, wildlife and of course every type of weather condition are vividly depicted in images captured from yours and our cameras.

What is missing in the slideshow above?  Your photo!

Our monthly photo slideshow is going to feature images that we have taken but more importantly images that you have captured.  The photos can be of anything even remotely weather-related.

Landscapes, current conditions, wildlife, pets, kids.  Whimsical, newsy, artsy.  Taken at the zoo, some other area attraction, a local park, a national park or your backyard.  You name it, we want to see and share it!

Images can be taken in Thornton, Denver or anywhere across the extraordinary Centennial State.  We’ll even take some from out of state if we can tie it to Colorado somehow.

We’ll keep the criteria very open to interpretation with just about any image eligible to be shown in our slideshows.

What do you win for having your image in our slideshow?  We are just a ‘mom and pop’ outfit and make no money from our site so we really don’t have the means to provide prizes.  However you will have our undying gratitude and the satisfaction that your images are shared on the most popular website in Thornton.

To share you images with us and get them included in the slideshow just email them to us or share them with ThorntonWeather.com on any of the various social media outlets.  Links are provided below.

So come on, get those camera’s rolling!

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Tuesday gets much colder, will bring rain and snow

Tuesday, October 30th, 2018 5:00am MDT

A big change from the unseasonably warm weather we have seen in recent days. A storm system will be pushing through that will send temps plunging and offer our first chance at precipitation in weeks.

Cloudy skies will be the rule today throughout. Temperatures are going to remain relatively stable with a high only in the lower 40s.

A few sprinkles of rain may pop up this morning with them becoming more likely in the afternoon. As we approach the evening and temperatures cool, a transition to snow should occur. We could see an inch or so between 6:00pm and midnight, then maybe just a bit more on top of that before dawn tomorrow.

Lows tonight will dip to around freezing.

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Thornton’s workweek starts with one more mild day, breezy PM winds

Monday, October 29th, 2018 4:59am MDT

Hopefully you took advantage of that warm weather this past weekend. If not, be sure you do so today because much colder and possibly wetter weather arrives tomorrow.

For today, mostly sunny skies will be above throughout. Temperatures will be topping out in the upper 70s, well above the normal for the date of 60 degrees. Conditions will be calm this morning then this afternoon winds will be picking up as a front approaches.

Tonight, clouds will be increasing and the wind will continue until the pre-dawn hours. Lows will be in the mid to upper 30s.

Looking ahead, Tuesday will be the coldest day of the week with highs only in the low 40s and a decent chance to snow. Unfortunately, little accumulation is expected for us. We will then see a gradual warm up into the latter half of the week. Get more details in the extended weather forecast here.

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October 28 to November 3: This week in Denver weather history

Sunday, October 28th, 2018 5:22am MDT
This week in Denver weather history

October 28 to November 3: This week in Denver weather history

As we move further into fall, we see the predominant significant weather in our history during the period involves snowstorms.

From the National Weather Service:


In 1874…strong west winds in Boulder along with a reported tornado produced 150 dollars in damage.

In 1913…a strong cold front produced sustained northeast winds to 35 mph with gusts as high as 38 mph on the 27th. Overnight snowfall totaled 5.8 inches. Temperatures plunged to a low of 17 degrees on the morning of the 28th after a high of 60 degrees on the 27th.


In 2009…a powerful early season storm brought heavy snow to the Front Range. The combination of a deep northeasterly upslope flow coupled with abundant moisture and lift with the developing storm system produced an extended period of moderate to heavy snowfall. The heavy wet snow accumulated on trees and resulted in broken branches and scattered electrical outages. Interstates 70 and 76 were closed east of Denver. Numerous other roads and highways were shut down. The Red Cross set up numerous emergency shelters for stranded travelers. The blowing snow at Denver International Airport forced the cancellation of hundreds of flights. Schools were also closed. In the foothills storm totals included: 46 inches… 3 miles southeast of Pinecliffe; 42 inches…3 miles southwest of conifer; 34 inches…3 miles north of Blackhawk; 30 inches at Aspen Springs and near Evergreen… 23 inches at Roxborough Park…and 20 inches…3 miles south-southeast of Morrison. Across the urban corridor storm totals included: 25 inches in Highlands Ranch; 21.5 inches near Louisville…20.5 inches in Broomfield… 20 inches at Lafayette…17.5 inches in Boulder…17 inches in Westminster…16.5 inches in Erie; 15.5 inches in Arvada and 5 miles west-northwest of Littleton…15 inches in Littleton…14 inches in Englewood…13.5 inches in Lakewood and 6 miles north of Thornton; 13.3 inches at Denver International Airport…11 inches…4 miles south of Denver; 10.5 inches…2 miles north of Cherry Hills Village and Niwot.


In 1917…post-frontal snowfall totaled 6.5 inches in the city. North winds sustained to 30 mph with gusts to 33 mph caused the temperature to plunge from a high of 58 degrees to a low of 9 degrees by midnight.

In 1967…winds gusted to 65 mph in downtown Boulder…causing minor damage. South winds gusted to 32 mph at Stapleton International Airport.

In 1991…the first major snow of the season hit metro Denver as a cold arctic air mass moved over the area. Snowfall amounts across northeast Colorado ranged from 3 to 10 inches with 4.4 inches of snowfall recorded at Stapleton International Airport where north winds gusted to 22 mph. The low temperature dipped to 13 degrees.

In 1993…high winds buffeted the Front Range foothills. A wind gust to 83 mph was recorded atop Squaw Mountain…35 miles west of Denver…and a gust to 76 mph occurred near Rollinsville southwest of Boulder.


In 1993…an upper level disturbance combined with a moist upslope flow to bring heavy snow to portions of metro Denver. Snowfall amounts ranged from 5.4 inches at Stapleton International Airport to 14 inches in Boulder. New snowfall totaled 8 inches at Gross Reservoir in the foothills 5 miles southwest of Boulder. On the 28th…north winds gusted to 30 mph at Stapleton International Airport where the temperature climbed to only 25 degrees on the 29th…equaling the record low maximum for the date.


In 1971…a vigorous cold front plunged temperatures from a high of 70 degrees on the 27th to record low levels on the 29th and 30th. Snowfall totaled 3.1 inches at Stapleton International Airport where north winds gusted to 23 mph. Some freezing drizzle also fell on the 28th. Record daily low maximum temperatures of 32 degrees on the 28th and 25 degrees on the 29th were established along with a daily record minimum of 13 degrees on the 30th.


In 1929…rain changed to snow on the afternoon of the 28th and continued until midday on the 30th followed by intermittent light snow which continued through the 31st. Snowfall over the four days totaled 16.2 inches in the city. Most of the snow…8.5 inches…fell on the 29th with 6.1 inches on the 30th. Temperatures hovered in 20’s during most of the storm.


In 1917…the all-time lowest recorded temperature in October…2 degrees below zero…occurred. This is also the earliest below zero reading of the season.

In 1939…the first measurable snow of the season totaled 5.6 inches in downtown Denver. Post-frontal northeast winds were sustained to 28 mph.

In 1961…heavy snowfall measured 6.0 inches at Stapleton Airport where northeast winds gusted to 30 mph.

In 1973…strong winds caused some damage to homes…stores… And utility lines along the foothills from metro Denver south.

In 1981…high winds buffeted the Front Range foothills with gusts to 55 mph in south Boulder.

In 1996…high winds gusting from 70 to around 100 mph blasted metro Denver. One man was killed when a strong wind gust overturned a pop-up camper onto him while he was trying to secure it. In addition…five people at the Rocky Flats Environmental Test Facility received minor injuries when several windshields were blown out of their cars…spraying glass onto the occupants. Several trees and power lines were also downed. Two 75-foot high pine trees were uprooted at the Mt. Olivet Cemetery in Arvada. Property damage from the windstorm ran into the millions of dollars. The highest recorded wind gusts included: 101 mph at Jefferson County Airport near Broomfield…100 mph in Golden Gate Canyon…96 mph in Coal Creek Canyon…and 87 mph at upper Table Mesa in Boulder. West-northwest winds gusted to 43 mph at Denver International Airport. Insured damage from the wind storm totaled 5.2 million dollars…the third most costly storm of record in Colorado at the time.

In 2003…strong Chinook winds developed in and near the Front Range foothills. Winds gusting to 80 mph in Boulder downed several trees and power lines…causing damage and triggering scattered electrical outages. The combination of strong winds…very dry fuel conditions…and downed power lines sparked two large wildfires. The overland wildfire in Boulder County…near Jamestown…consumed nearly 3900 acres and destroyed 12 structures…including homes…trailers…and out-buildings. Preliminary damage estimates for the value of lost property was nearly one million dollars. In Douglas County…the Cherokee Ranch wildfire consumed 1200 acres and destroyed 4 structures. The large smoke plumes from both fires were highly visible across metro Denver. West winds gusted to 45 mph at Denver International Airport.

» Click here to read the rest of October 28 to November 3: This week in Denver weather history

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Thornton to enjoy a pleasant fall weekend with unseasonably warm temps, calm conditions

Friday, October 26th, 2018 5:00am MDT

If you like your weekends with lots of sun and mild temperatures, then you will be pleased with this one. Other than some breezy winds Saturday afternoon, it will be a good one to spend some time outdoors.

Things get started on Friday with mostly sunny skies above throughout the day. Highs will be topping out in the upper 60s with overall calm conditions. Friday night, partly cloudy skies will be above with lows in the low 40s.

Saturday will be the warmest of the three day period with highs in the low to mid-70s under mostly sunny skies. There will be some breezy winds in the afternoon and early evening as a weak cold front moves through. Saturday night into Sunday morning, partly sunny skies will be above with a low temp reading around 40 degrees.

We close out the weekend on Sunday with a healthy dose of sun, calm conditions and highs in the mid to upper 60s.

Enjoy the weekend weather!

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Thornton’s Thursday to offer temps a bit above normal, increasing clouds

Thursday, October 25th, 2018 4:58am MDT

A pretty decent day ahead for us as mercury readings will come in a bit above normal. We will see an increase in cloud cover though as a system pushes through.

Mostly sunny skies start things off. By late morning / early afternoon clouds will increase. However, we are not expecting any moisture in our area as that should stay to our west.

Winds will be a touch breezy in the afternoon but not too intrusive. Highs today will top out in the mid-60s.

Tonight, clouds will decrease with lows near the 40 degree mark.

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A few sprinkles early then seasonal conditions for the rest of Thornton’s Wednesday

Wednesday, October 24th, 2018 5:04am MDT

We’re seeing a few sprinkles of rain early but those have not amounted to much and will be ending soon. The balance of the day will see skies clear a bit and temps top out near normal.

Mostly cloudy skies start things off with a few of the aforementioned sprinkles of rain. Those will be ending by 8:00am then the rest of the day will remain dry. Skies will see some clearing with partly sunny skies arriving for the afternoon. Temperatures today will top out right near the average high for the date of 62 degrees.

Tonight, skies will be partly clear with lows around 40 degrees.

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