Average Weather in October in Thornton Colorado, United States
Daily high temperatures decrease by 12°F, from 72°F to 60°F, rarely falling below 44°F or exceeding 84°F.
Daily low temperatures decrease by 10°F, from 45°F to 35°F, rarely falling below 24°F or exceeding 54°F.
For reference, on July 13, the hottest day of the year, temperatures in Thornton typically range from 61°F to 88°F, while on December 30, the coldest day of the year, they range from 22°F to 43°F.
Average High and Low Temperature in October
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on October. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in October
The month of October in Thornton experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 27% to 36%.
The clearest day of the month is October 1, with clear, mostly clear, or partly cloudy conditions 73% of the time.
For reference, on March 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 47%, while on September 13, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 75%.
Cloud Cover Categories in October
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Thornton, the chance of a wet day over the course of October is essentially constant, remaining around 13% throughout.
For reference, the year's highest daily chance of a wet day is 30% on July 23, and its lowest chance is 6% on December 19.
Over the course of October in Thornton, the chance of a day with only rain decreases from 12% to 8%, the chance of a day with mixed snow and rain increases from 1% to 3%, and the chance of a day with only snow remains an essentially constant 1% throughout.
Probability of Precipitation in October
The average sliding 31-day rainfall during October in Thornton is gradually decreasing, starting the month at 0.8 inches, when it rarely exceeds 1.7 inches or falls below 0.1 inches, and ending the month at 0.5 inches, when it rarely exceeds 1.1 inches or falls below 0.1 inches.
Average Monthly Rainfall in October
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during October in Thornton is essentially constant, remaining about 0.1 inches throughout, and rarely exceeding 0.6 inches or falling below -0.0 inches.
Average Monthly Liquid-Equivalent Snowfall in October
Over the course of October in Thornton, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 15 minutes, implying an average daily decrease of 2 minutes, 30 seconds, and weekly decrease of 17 minutes, 28 seconds.
The shortest day of the month is October 31, with 10 hours, 31 minutes of daylight and the longest day is October 1, with 11 hours, 46 minutes of daylight.
Hours of Daylight and Twilight in October
The earliest sunrise of the month in Thornton is 6:56 AM on October 1 and the latest sunrise is 32 minutes later at 7:27 AM on October 31.
The latest sunset is 6:42 PM on October 1 and the earliest sunset is 43 minutes earlier at 5:58 PM on October 31.
Daylight saving time is observed in Thornton during 2018, but it neither starts nor ends during October, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:31 AM and sets 15 hours, 0 minutes later, at 8:31 PM, while on December 21, the shortest day of the year, it rises at 7:17 AM and sets 9 hours, 20 minutes later, at 4:38 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in October
The chance that a given day will be muggy in Thornton is essentially constant during October, remaining around 0% throughout.
For reference, on July 16, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in October
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Thornton is essentially constant during October, remaining within 0.2 miles per hour of 7.5 miles per hour throughout.
For reference, on January 17, the windiest day of the year, the daily average wind speed is 9.8 miles per hour, while on August 19, the calmest day of the year, the daily average wind speed is 6.9 miles per hour.
Average Wind Speed in October
Wind Direction in October
The growing season in Thornton typically lasts for 5.5 months (166 days), from around April 28 to around October 11, rarely starting before April 7 or after May 16, and rarely ending before September 19 or after November 2.
During October in Thornton, the chance that a given day is within the growing season is very rapidly decreasing falling from 71% to 13% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in October
The average accumulated growing degree days in Thornton are increasing during October, increasing by 185°F, from 2,914°F to 3,100°F, over the course of the month.
Growing Degree Days in October
The average daily incident shortwave solar energy in Thornton is decreasing during October, falling by 1.5 kWh, from 5.1 kWh to 3.6 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in October
For the purposes of this report, the geographical coordinates of Thornton are 39.868 deg latitude, -104.972 deg longitude, and 5,266 ft elevation.
The topography within 2 miles of Thornton contains only modest variations in elevation, with a maximum elevation change of 446 feet and an average elevation above sea level of 5,273 feet. Within 10 miles contains only modest variations in elevation (830 feet). Within 50 miles contains very significant variations in elevation (9,806 feet).
The area within 2 miles of Thornton is covered by artificial surfaces (73%) and shrubs (27%), within 10 miles by shrubs (48%) and artificial surfaces (35%), and within 50 miles by grassland (32%) and trees (26%).
This report illustrates the typical weather in Thornton year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Thornton.
For each station, the records are corrected for the elevation difference between that station and Thornton according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Thornton is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Thornton and a given station.
The stations contributing to this reconstruction are: Rocky Mountain Metropolitan Airport (35%, 13 kilometers, west); Denver / Stapleton International, Co. (36%, 16 kilometers, southeast); and Erie Municipal (29%, 18 kilometers, north).
Time zones for aiports and weather stations are provided by AskGeo.com .