Average Weather in December in Willmar Minnesota, United States
Daily high temperatures decrease by 9°F, from 32°F to 23°F, rarely falling below 4°F or exceeding 46°F.
Daily low temperatures decrease by 10°F, from 16°F to 7°F, rarely falling below -13°F or exceeding 31°F.
For reference, on July 18, the hottest day of the year, temperatures in Willmar typically range from 63°F to 82°F, while on January 15, the coldest day of the year, they range from 6°F to 23°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 Willmar experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 57% throughout the month.
The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 44% of the time.
For reference, on February 5, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 60%, while on July 28, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 74%.
Cloud Cover Categories in December
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Willmar, the chance of a wet day over the course of December is gradually decreasing, starting the month at 11% and ending it at 8%.
For reference, the year's highest daily chance of a wet day is 39% on June 13, and its lowest chance is 7% on February 1.
Over the course of December in Willmar, the chance of a day with only rain remains an essentially constant 2% throughout, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 6% throughout.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Willmar is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 1.0 inches or falling below -0.0 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 Willmar is essentially constant, remaining about 0.4 inches throughout, and rarely exceeding 1.2 inches or falling to 0.0 inches.
The highest average 31-day liquid-equivalent accumulation is 0.4 inches on December 8.
Average Monthly Liquid-Equivalent Snowfall in December
Over the course of December in Willmar, the length of the day is essentially constant. The shortest day of the month is December 21, with 8 hours, 45 minutes of daylight and the longest day is December 1, with 9 hours, 1 minute of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Willmar is 7:38 AM on December 1 and the latest sunrise is 20 minutes later at 7:58 AM on December 31.
The earliest sunset is 4:38 PM on December 10 and the latest sunset is 10 minutes later at 4:47 PM on December 31.
Daylight saving time is observed in Willmar during 2018, but it neither starts nor ends during December, so the entire month 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, 38 minutes later, at 9:11 PM, while on December 21, the shortest day of the year, it rises at 7:55 AM and sets 8 hours, 45 minutes later, at 4:40 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Willmar is essentially constant during December, remaining around 0% throughout.
For reference, on July 20, the muggiest day of the year, there are muggy conditions 33% 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
The average hourly wind speed in Willmar is essentially constant during December, remaining within 0.3 miles per hour of 11.6 miles per hour throughout.
For reference, on April 8, the windiest day of the year, the daily average wind speed is 12.9 miles per hour, while on July 31, the calmest day of the year, the daily average wind speed is 8.6 miles per hour.
Average Wind Speed in December
Wind Direction in December
The growing season in Willmar typically lasts for 5.3 months (160 days), from around April 27 to around October 5, rarely starting before April 8 or after May 16, and rarely ending before September 17 or after October 24.
The month of December in Willmar 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 Willmar are essentially constant during December, remaining around 2,713°F throughout.
Growing Degree Days in December
The average daily incident shortwave solar energy in Willmar is essentially constant during December, remaining within 0.1 kWh of 1.5 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 1.5 kWh on December 20.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Willmar are 45.122 deg latitude, -95.043 deg longitude, and 1,129 ft elevation.
The topography within 2 miles of Willmar contains only modest variations in elevation, with a maximum elevation change of 98 feet and an average elevation above sea level of 1,129 feet. Within 10 miles also contains only modest variations in elevation (203 feet). Within 50 miles contains only modest variations in elevation (679 feet).
The area within 2 miles of Willmar is covered by artificial surfaces (44%), cropland (39%), and water (17%), within 10 miles by cropland (83%) and water (11%), and within 50 miles by cropland (91%).
This report illustrates the typical weather in Willmar 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 Willmar.
For each station, the records are corrected for the elevation difference between that station and Willmar 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 Willmar is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Willmar and a given station.
The stations contributing to this reconstruction are: Willmar, Willmar Municipal Airport-John L Rice Field (96%, 3.2 kilometers, west); Paynesville Municipal Airport (2.5%, 36 kilometers, northeast); and Litchfield Municipal Airport (2.0%, 42 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .