Average Weather in December in Fillmore Utah, United States
Daily high temperatures decrease by 7°F, from 43°F to 37°F, rarely falling below 25°F or exceeding 55°F.
Daily low temperatures decrease by 5°F, from 21°F to 17°F, rarely falling below 3°F or exceeding 33°F.
For reference, on July 13, the hottest day of the year, temperatures in Fillmore typically range from 60°F to 92°F, while on January 3, the coldest day of the year, they range from 17°F to 37°F.
Average High and Low Temperature in December
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. 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 December
The month of December in Fillmore experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 43% throughout the month.
The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 58% of the time.
For reference, on February 29, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 49%, while on September 16, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 81%.
Cloud Cover Categories in December
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 Fillmore, the chance of a wet day over the course of December is essentially constant, remaining around 13% throughout.
For reference, the year's highest daily chance of a wet day is 20% on April 9, and its lowest chance is 7% on June 26.
Over the course of December in Fillmore, the chance of a day with only rain remains an essentially constant 4% throughout, the chance of a day with mixed snow and rain remains an essentially constant 4% throughout, and the chance of a day with only snow increases from 3% to 5%.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Fillmore is essentially constant, remaining about 0.4 inches throughout, and rarely exceeding 1.0 inches.
Average Monthly Rainfall in December
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 December in Fillmore is essentially constant, remaining about 0.4 inches throughout, and rarely exceeding 1.0 inches or falling to 0.0 inches.
The highest average 31-day liquid-equivalent accumulation is 0.4 inches on December 23.
Average Monthly Liquid-Equivalent Snowfall in December
Over the course of December in Fillmore, the length of the day is essentially constant. The shortest day of the month is December 20, with 9 hours, 26 minutes of daylight and the longest day is December 1, with 9 hours, 38 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Fillmore is 7:29 AM on December 1 and the latest sunrise is 18 minutes later at 7:48 AM on December 31.
The earliest sunset is 5:06 PM on December 6 and the latest sunset is 11 minutes later at 5:17 PM on December 31.
Daylight saving time is observed in Fillmore during 2020, but it neither starts nor ends during December, so the entire month is in standard time.
For reference, on June 20, the longest day of the year, the Sun rises at 6:03 AM and sets 14 hours, 54 minutes later, at 8:58 PM, while on December 21, the shortest day of the year, it rises at 7:44 AM and sets 9 hours, 26 minutes later, at 5:10 PM.
Sunrise & Sunset with Twilight in December
The chance that a given day will be muggy in Fillmore is essentially constant during December, 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 December
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Fillmore is essentially constant during December, remaining within 0.2 miles per hour of 6.4 miles per hour throughout.
For reference, on April 4, the windiest day of the year, the daily average wind speed is 8.5 miles per hour, while on January 7, the calmest day of the year, the daily average wind speed is 6.1 miles per hour.
Average Wind Speed in December
The hourly average wind direction in Fillmore throughout December is predominantly from the south, with a peak proportion of 47% on December 20.
Wind Direction in December
The growing season in Fillmore typically lasts for 4.8 months (146 days), from around May 10 to around October 3, rarely starting before April 19 or after June 2, and rarely ending before September 15 or after October 21.
The month of December in Fillmore is reliably fully outside of the growing season.
Time Spent in Various Temperature Bands and the Growing Season in December
The average accumulated growing degree days in Fillmore are essentially constant during December, remaining within 2°F of 3,206°F throughout.
Growing Degree Days in December
The average daily incident shortwave solar energy in Fillmore is essentially constant during December, remaining within 0.1 kWh of 2.5 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 2.4 kWh on December 21.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Fillmore are 38.969 deg latitude, -112.324 deg longitude, and 5,141 ft elevation.
The topography within 2 miles of Fillmore contains significant variations in elevation, with a maximum elevation change of 617 feet and an average elevation above sea level of 5,154 feet. Within 10 miles contains significant variations in elevation (5,577 feet). Within 50 miles also contains extreme variations in elevation (7,723 feet).
The area within 2 miles of Fillmore is covered by shrubs (49%), grassland (29%), and cropland (22%), within 10 miles by shrubs (47%) and trees (21%), and within 50 miles by shrubs (70%) and trees (15%).
This report illustrates the typical weather in Fillmore 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Fillmore.
For each station, the records are corrected for the elevation difference between that station and Fillmore 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 Fillmore is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Fillmore and a given station.
Time zones for aiports and weather stations are provided by AskGeo.com .