Thornton, Colorado, USA
UpdatedFri, 31-Oct-2014 1:45pm MDT 


ThorntonWeather.com on Twitter

ThorntonWeather.com on Facebook


Weather Geek Stuff - weathergeekstuff.com

Rocky Mountain Weather Network

Denver Weather Examiner
Climate Change Examiner
Natural Disasters Examiner


Recent News and Posts

Thornton’s workweek starts out much cooler

Monday, October 27th, 2014 5:15am MDT

With the passing of a cold front last night, we usher in a big change in temperatures from what we have seen for the week or so and possibly a freeze overnight tonight.  The rest of the week will feature temperatures near or above normal and dry conditions.

For today, a few showers were seen early on radar but they were to the north of our area so it looks like we will be missing out on any precipitation.  We will start the day with a good bit of cloud cover but that will be decreasing as the day progresses.  Winds will be gusty this afternoon.  Temperatures will top out in the mid-50s, about 20 degrees cooler than yesterday’s high temperature.

A Freeze Watch is in effect for tonight and tomorrow morning with temperatures possibly dipping below freezing.  However, latest models point to some downslope winds and possible cloud cover that could keep the mercury from dipping that low.

Looking ahead, Tuesday will be a couple of degrees warmer that today and Wednesday will see highs back near 70 degrees.  A weak cold front returns us to near normal temperatures Thursday and then Friday and Saturday we rebound to temperatures near or above 70.

See the image for today’s outlook and get the latest extended forecast here: http://www.thorntonweather.com/forecast.php

Join the Discussion - Post your commentJoin the Discussion!

October 26 to November 1: This Week in Denver Weather History

Sunday, October 26th, 2014 4:22am MDT
This Week In Denver Weather History

October 26 to November 1: This Week in Denver Weather History

Wind can be one of the most frustrating weather conditions to experience and our look back at this week in Denver weather history shows the period has seen more than its fair share. Also notable are many significant snow events that have occurred in the Mile High City over the seven day period.

From the National Weather Service:


In 2010…very strong winds during the day knocked down power lines in parts of Boulder. The downed electrical lines sparked a small brush fire near Columbine Elementary School. Strong wind gusts also damaged the tennis bubble at the Millennium Harvest House. In Northglenn, a tree was knocked down and caused minor damage to a mini-van parked nearby. Peak wind gusts included: 70 mph at Berthoud…67 mph at Rocky Mountain Metropolitan Airport in Broomfield… 63 mph at the Rocky Flats National Wind Technology Center and 59 mph at the NCAR Mesa Laboratory…3 miles southwest of Boulder. West winds gusted to 43 mph at Denver International Airport.

In 2011…a powerful early season storm brought heavy snow to the Front Range and adjacent plains. The heavy…wet snow caused extensive downed large branches and in some cases…entire trees. Massive power outages occurred from Fort Collins and Greeley south to Denver and the surrounding metro area. Most of the trees still had their leaves…which helped to catch snow and down trees under the weight of the moisture laden snow. Nearly two hundred thousand utility customers along the Front Range were without heat and electricity for several hours. The Red Cross opened four temporary shelters overnight until the power could be restored. The outages also forced the closure of the Boulder Criminal Justice Center the following day. The fallen trees and branches also caused extensive property damage to roofs and automobiles. In the Front Range mountains and foothills…storm totals included 19.8 inches…3 miles west of Jamestown; 18 inches…5 miles west of copper; 13 inches…3 miles north of Blackhawk and 3 miles south of Evergreen…4 miles east-northeast of Nederland and Lake Eldora; 12 inches at Berthoud SNOTEL. Across the urban corridor storm totals included: 11.5 inches in Boulder; 9.5 inches at the national weather service in Boulder; 9 inches…1 mile southwest of Westminster; 8.5 inches in Broomfield… Denver International Airport…Frederick and Louisville; 8 inches in Aurora…7 inches in Watkins; with 6 inches in Arvada.


In 1996…4 to 6 inches of snow fell in the foothills west of Denver. Only 1.5 inches of snowfall were measured at the site of the former Stapleton International Airport on the 26th. This was the only measurable snow of the month at the site. The snowfall produced icy and snowpacked highways…which resulted in a 50-to 60-car pileup on I-25 south of metro Denver. West winds gusted to 33 mph at Denver International Airport.

In 2006…a winter storm brought heavy snowfall to metro Denver and the eastern foothills. Total snowfall ranged from 12 to 22 inches over the higher terrain and 6 to 12 inches across metro Denver. Northerly winds at sustained speeds of 20 to 30 mph with gusts as high as 47 mph at Denver International Airport whipped the snow into drifts 3 to 4 feet deep. Many tree limbs snapped under the weight of the heavy…wet snow which also downed power lines… Leaving thousands of residents without power. Storm total snowfall included: 25 inches near Aspen Springs…Conifer… And Evergreen; 23.5 inches near Rollinsville; 23 inches in Idaho Springs; 22.5 inches near Blackhawk; 21.5 inches near Bailey; 19 inches near Bergen Park; 18 inches near Aspen Springs…Genesee…and Jamestown; 17 inches southwest of Boulder; 16 inches in Evergreen; and 15 inches near Georgetown and Perry Park. Snowfall totaled 5.3 inches in the Denver Stapleton area. At Denver International Aiport…rain…including a thunderstorm…changed to snow on the evening of the 25th after a high temperature of 70 degrees.

In 2010…a storm system brought heavy snow to the mountains west of Denver. Storm totals included: 24 inches at the Eisenhower Tunnel…18 inches at Loveland Ski Area; with 16 inches at Arapahoe basin.


In 1897…a major storm dumped 13.5 inches of snowfall over downtown Denver. Rain changed to snow during the evening of the 25th and continued through mid-morning of the 27th. Most of the snow…12.0 inches…fell on the 26th when north winds were sustained to 36 mph and gusts were as high as 46 mph. Temperatures during the storm were in the 20’s and lower 30’s. Precipitation (rain and melted snow) totaled 1.21 inches.

» Click here to read the rest of October 26 to November 1: This Week in Denver Weather History

Join the Discussion - Post your commentJoin the Discussion!

Denver ties record high temperature for October 25, becomes third record this month

Saturday, October 25th, 2014 4:05pm MDT

Record setting high temperatures in Thornton.With a record-tying high temperature reading today, Denver recorded its third high temperature record of October 2014.

At 3:24pm Denver International Airport reported a reading of 80 degrees.  This tied the record high mark for the date last set in 2007.

Thornton matched the Denver reading with 80 degrees as well.

Today’s record follows a record-breaking day yesterday and another back on the 15th of the month.

The unseasonably warm weather of the past week will begin coming to an end soon.  Slightly cooler weather is on tap tomorrow and then with a cold front moving in Sunday night, temperatures close to normal are expected for much of the week.

  • Stay up to date with Thornton’s weather: Be sure to ‘like’ us on Facebook, follow us on Twitter and add us to your Google+ circles.
Join the Discussion - Post your commentJoin the Discussion!

Winter Weather Preparedness Week recap

Saturday, October 25th, 2014 5:48am MDT
Winter Weather Preparedness Week concludes.  Are you ready for winter?

Winter Weather Preparedness Week concludes. Are you ready for winter?

As we have talked about this week, winter weather can be dangerous and downright deadly.  However, being prepared helps to ensure that you and your family remain safe when the snow starts to fly or other winter weather conditions occur.

It is very easy to ignore the dangers of weather – no matter the season – and find yourself saying, “I wish I would have….” Now is the time to think about how you can prepare for these conditions, before it is too late and you find yourself wishing you had.

In this sixth and final message in a series on Winter Weather Preparedness from the National Weather Service, ThorntonWeather.com reviews the topics we covered this week and directs you to the previous articles and other resources to help you get ready.

600 AM MDT SAT OCT 25 2014

Enjoy the great outdoors in Colorado this winter season, but watch the weather.

The National Weather Service issues a variety of winter weather, outlooks, watches, warnings, and advisories, covered earlier during this Winter Weather Preparedness Week.  Safety tips were also passed along.

» Click here to read the rest of Winter Weather Preparedness Week recap

Join the Discussion - Post your commentJoin the Discussion!

Record high temperature set for October 24

Friday, October 24th, 2014 4:00pm MDT

Record setting high temperatures in Thornton.Forecasts held true and our unseasonably warm weather pushed the mercury into record-setting territory today.

At 3:24pm the temperature at Denver International Airport reached 82 degrees.  This easily bests the record high temperature for the date of 80 degrees set in 2011.

Here in Thornton we were just ever-so-slightly cooler with a high of 81.0 degrees.

This was the second high temperature record set this month.  The first came on the 15th.

Today’s high temperature record is likely the first of two in a row.  High pressure will continue to dominate and likely bring another record-breaker tomorrow.

  • Stay up to date with Thornton’s weather: Be sure to ‘like’ us on Facebook, follow us on Twitter and add us to your Google+ circles.
Join the Discussion - Post your commentJoin the Discussion!

October 2014 top shots: Monthly photo slideshow

Friday, October 24th, 2014 5:55am MDT
October 1, 2014 - Sunrise at the Rocky Mountain Arsenal. (Ed Dalton)

October 1, 2014 – Sunrise at the Rocky Mountain Arsenal. (Ed Dalton)

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 24, 2014
  • 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!

Join the Discussion - Post your commentJoin the Discussion!

Avalanche safety – Be prepared or die

Friday, October 24th, 2014 5:16am MDT
Avalanches claim lives every year in Colorado. Before you head to the mountains, be sure you are prepared! (Wikimedia Commons)

Avalanches claim lives every year in Colorado. Before you head to the mountains, be sure you are prepared! (Wikimedia Commons)

As snow starts to fall, many Coloradoans and out of state visitors will take advantage of it and head to the mountains for a variety of outdoor activities.  Whether skiing, snowshoeing, or hiking, anyone who spends time outdoors in the high country needs to be aware of the danger avalanches present.  On average six people die in Colorado every year from avalanches and being prepared is an essential survival skill.

In this fifth in a series on Winter Weather Preparedness from the National Weather Service, ThorntonWeather.com helps you understand avalanches, where they occur, how to protect yourself and where to go for more information.  If you are headed to the high country, be sure to check out our Avalanche Information & Forecast page.

600 AM MDT FRI OCT 24 2014

Avalanches – Are you prepared?

Thousands of avalanches occur each winter in the mountains of Colorado.  With the enormous popularity of winter sports in Colorado, this poses a risk to skiers, snowboarders, hikers and snowmobilers.  On average 6 people die in avalanches in the state of Colorado every year.  Anyone who travels into the high country in the winter should be prepared for avalanches and know how to avoid them.

The first thing to know is most avalanches occur during or just after snowstorms and most occur on a slope of 30 to 45 degrees. A significant snowfall may result in an unstable snowpack.  By waiting 36 hours after a big snowstorm you may allow the snow to become more stable.  If you stay in valleys away from avalanche chutes, in stands of dense trees, or on gentle slopes you can minimize your avalanche risk.

» Click here to read the rest of Avalanche safety – Be prepared or die

Join the Discussion - Post your commentJoin the Discussion!

Back to back record-setting high temperatures expected Friday and Saturday

Friday, October 24th, 2014 5:14am MDT

Our unseasonably warm October continues today and through the weekend.  Friday and Saturday are likely to see high temperatures that break the records for those dates.

For today we will start out with a bit of cloud cover but that will be moving out.  We will be warming up quickly with high temperatures expected in the low 80s.  The record high for today’s date is 80 degrees set in 2011 and it certainly is in jeopardy.

Saturday looks to be the warmest day of the three.  Sunny skies will be above and temperatures will be pushing toward the mid-80s.  The record high temperature for October 25 is also 80 degrees (last set in 2007) so that record may fall as well.

On Sunday things cool down some but temperatures remain well above normal.  Look for highs in the mid-70s.

A front will be moving in Sunday night and that is expected to bring temperatures down to more normal levels next week.  In fact, Monday night may bring our first hard freeze of the season.

Stay tuned to http://www.thorntonweather.com/ for the latest news and conditions through the weekend.

Join the Discussion - Post your commentJoin the Discussion!

Life threatening winter weather – Wind chill, frostbite and hypothermia

Thursday, October 23rd, 2014 5:45am MDT
Wind chill is a life threatening weather danger that is often ignored or underestimated. (AP Photo)

Wind chill is a life threatening weather danger that is often ignored or underestimated.

Winter weather can not only be trying on the mind and soul, it also presents very real dangers to the human body.  Extreme wind chills can be deadly and bring on the outset of frostbite and hypothermia.  Here in Colorado, all residents should be aware of these hazards and be prepared to deal with them.

In this fourth in a series on Winter Weather Preparedness from the National Weather Service, ThorntonWeather.com helps you understand wind chill and how to protect yourself from frostbite and hypothermia.

600 AM MDT THU OCT 23 2014

Extreme wind chill – Potentially life-threatening and often overlooked

The combination of wind and low temperature in winter can be deadly. The wind chill index helps you determine when dangerous conditions develop that could lead to frostbite or hypothermia.  It takes into account heat loss from the human body to its surroundings during cold and windy weather.  The calculation utilizes wind speed in miles per hour and temperature in degrees Fahrenheit.  For example, a temperature of minus 5 degrees occurring with a 20 mph wind gives a wind chill near minus 30 degrees.  This means that your body will lose heat at the same rate as it would if the air temperature were minus 30 degrees with no wind.  Wind chill values near minus 25 degrees mean that frostbite is possible within 15 minutes.

  • How does the wind affect wind chill?  See the chart below.

Frostbite is the freezing of skin and the body tissue just beneath it. It first affects exposed body tissue where blood circulation may be limited such as your fingers, toes, nose and ears. To minimize frostbite, make sure all body parts are well covered. When frostbite starts, feeling is lost in the affected area and the frozen tissue will take on a white or pale appearance. If you suspect you are experiencing frostbite, hold the frostbitten area closely against warm skin to return blood flow and warmth to the affected area.

Hypothermia is a dangerously low body temperature and is the most common winter weather killer. When you hear of a hiker, climber, hunter or a stranded traveler perishing from cold weather exposure, hypothermia was the cause. Most people are surprised to learn that hypothermia deaths can occur with temperatures between 30 and 50 degrees. If you or your clothing are wet, then hypothermia becomes even more likely.

Warning signs of hypothermia include uncontrollable shivering, memory loss, disorientation, slurred speech and drowsiness. Immediate medical attention should be given to victims suspected of suffering from hypothermia. If no help is available, the victim should be warmed slowly with warm liquids along with dry clothing and blankets.

The national weather service will issue wind chill advisories and warnings when a deadly combination of wind and cold air threaten. To learn more about wind chill, visit the national weather service internet site using lower case letters:

When cold weather threatens, follow these tips for survival:

Stay dry, wet clothing results in much faster heat loss from your body. Wear waterproof insulated boots.

Stay covered, wear mittens or gloves and wear a hat. At least half of your body heat is lost if your head is not covered.

Dress layered, trapped air between loose fitting clothing helps to insulate.

Stay informed, have a portable NOAA weather radio nearby to keep you up-to-date with the latest forecasts and warnings. Use wind chill temperatures to guide you in dressing properly for the outdoors. On very cold days, minimize your exposure to the outdoors if possible.

Wind Chill Chart

Join the Discussion - Post your commentJoin the Discussion!

Temperatures climb back up Thursday, record setters possibly ahead

Thursday, October 23rd, 2014 5:14am MDT

High pressure is once again building over the region and that is going to return very unseasonably warm temperatures through Sunday.  Tomorrow and Saturday we may be seeing record-setting warmth.

For today look for mostly sunny skies throughout the day.  That should allow for some good viewing of today’s solar eclipse.

The morning starts out a bit chilly but we will be warming up nicely and heading for a high in the mid to upper 70s.  This is well above the average for the date of 62 degrees.

Looking ahead, Friday and Saturday may very well see high temperature readings that break the record of 80 degrees on both days.

Keep an eye on the mercury today: http://www.thorntonweather.com/live-weather-2.php

Join the Discussion - Post your commentJoin the Discussion!