Winter Weather in Westminster Colorado, United States
Daily high temperatures increase by 3°F, from 49°F to 52°F, rarely falling below 27°F or exceeding 66°F. The lowest daily average high temperature is 44°F on December 30.
Daily low temperatures are around 26°F, rarely falling below 7°F or exceeding 41°F. The lowest daily average low temperature is 23°F on December 30.
For reference, on July 10, the hottest day of the year, temperatures in Westminster typically range from 62°F to 88°F, while on December 30, the coldest day of the year, they range from 23°F to 44°F.
Average High and Low Temperature in the Winter in Westminster
The figure below shows you a compact characterization of the hourly average winter temperatures. 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 the Winter in Westminster
The winter in Westminster experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 41% to 45%.
The clearest day of the winter is January 13, with clear, mostly clear, or partly cloudy conditions 61% 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 the Winter in Westminster
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 Westminster, the chance of a wet day over the course of the winter is gradually increasing, starting the season at 8% and ending it at 10%.
For reference, the year's highest daily chance of a wet day is 30% on July 22, and its lowest chance is 6% on December 19.
Over the course of the winter in Westminster, the chance of a day with only rain increases from 2% to 5%, the chance of a day with mixed snow and rain remains an essentially constant 2% throughout, and the chance of a day with only snow remains an essentially constant 3% throughout.
Probability of Precipitation in the Winter in Westminster
To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during the winter in Westminster is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 1.1 inches.
The lowest average 31-day accumulation is 0.1 inches on December 29.
Average Monthly Rainfall in the Winter in Westminster
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 the winter in Westminster is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.5 inches or falling to 0.0 inches.
The highest average 31-day liquid-equivalent accumulation is 0.2 inches on December 21.
Average Monthly Liquid-Equivalent Snowfall in the Winter in Westminster
Over the course of the winter in Westminster, the length of the day is rapidly increasing. From the start to the end of the season, the length of the day increases by 1 hour, 43 minutes, implying an average daily increase of 1 minute, 10 seconds, and weekly increase of 8 minutes, 8 seconds.
The shortest day of the winter is December 21, with 9 hours, 21 minutes of daylight and the longest day is February 28, with 11 hours, 17 minutes of daylight.
Hours of Daylight and Twilight in the Winter in Westminster
The latest sunrise of the winter in Westminster is 7:21 AM on January 5 and the earliest sunrise is 47 minutes earlier at 6:34 AM on February 28.
The earliest sunset is 4:35 PM on December 7 and the latest sunset is 1 hour, 16 minutes later at 5:51 PM on February 28.
Daylight saving time is observed in Westminster during 2021, but it neither starts nor ends during the winter, so the entire season is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:32 AM and sets 15 hours, 0 minutes later, at 8:32 PM, while on December 21, the shortest day of the year, it rises at 7:18 AM and sets 9 hours, 21 minutes later, at 4:38 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in the Winter in Westminster
The figure below presents a compact representation of key lunar data for the winter of 2021. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
Moon Rise, Set & Phases in the Winter in Westminster
The chance that a given day will be muggy in Westminster is essentially constant during the winter, 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 the Winter in Westminster
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Westminster is essentially constant during the winter, remaining within 0.6 miles per hour of 9.2 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 6.7 miles per hour.
The highest daily average wind speed during the winter is 9.8 miles per hour on January 18.
Average Wind Speed in the Winter in Westminster
The hourly average wind direction in Westminster throughout the winter is predominantly from the west, with a peak proportion of 69% on January 12.
Wind Direction in the Winter in Westminster
The growing season in Westminster typically lasts for 5.6 months (169 days), from around April 27 to around October 13, rarely starting before April 5 or after May 15, and rarely ending before September 21 or after November 3.
The winter in Westminster is reliably fully outside of the growing season.
Time Spent in Various Temperature Bands and the Growing Season in the Winter in Westminster
The average accumulated growing degree days in Westminster are very rapidly decreasing during the winter, decreasing by 3,203°F, from 3,245°F to 43°F, over the course of the season.
Growing Degree Days in the Winter in Westminster
The average daily incident shortwave solar energy in Westminster is rapidly increasing during the winter, rising by 1.7 kWh, from 2.6 kWh to 4.3 kWh, over the course of the season.
The lowest average daily incident shortwave solar energy during the winter is 2.4 kWh on December 22.
Average Daily Incident Shortwave Solar Energy in the Winter in Westminster
For the purposes of this report, the geographical coordinates of Westminster are 39.837 deg latitude, -105.037 deg longitude, and 5,381 ft elevation.
The topography within 2 miles of Westminster contains only modest variations in elevation, with a maximum elevation change of 344 feet and an average elevation above sea level of 5,373 feet. Within 10 miles contains only modest variations in elevation (1,542 feet). Within 50 miles contains very significant variations in elevation (9,767 feet).
The area within 2 miles of Westminster is covered by artificial surfaces (79%) and shrubs (21%), within 10 miles by artificial surfaces (44%) and shrubs (40%), and within 50 miles by grassland (30%) and trees (29%).
This report illustrates the typical weather in Westminster, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Westminster.
For each station, the records are corrected for the elevation difference between that station and Westminster 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 Westminster is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Westminster and a given station.
The stations contributing to this reconstruction are: Rocky Mountain Metropolitan Airport (KBJC, 65%, 10 kilometers, northwest) and Denver / Stapleton International, Co. (KDNR, 35%, 17 kilometers, southeast).
Time zones for airports and weather stations are provided by AskGeo.com .