Average Weather in December in Manson Washington, United States
Daily high temperatures decrease by 5°F, from 37°F to 32°F, rarely falling below 21°F or exceeding 45°F. The lowest daily average high temperature is 32°F on December 24.
Daily low temperatures decrease by 4°F, from 27°F to 23°F, rarely falling below 11°F or exceeding 36°F. The lowest daily average low temperature is 23°F on December 30.
For reference, on August 2, the hottest day of the year, temperatures in Manson typically range from 61°F to 88°F, while on December 30, the coldest day of the year, they range from 23°F to 32°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 Manson experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 65% throughout the month.
The clearest day of the month is December 8, with clear, mostly clear, or partly cloudy conditions 36% of the time.
For reference, on January 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 67%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 79%.
Cloud Cover Categories in December
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Manson, the chance of a wet day over the course of December is decreasing, starting the month at 36% and ending it at 32%.
For reference, the year's highest daily chance of a wet day is 36% on November 28, and its lowest chance is 6% on August 10.
Over the course of December in Manson, the chance of a day with only rain decreases from 18% to 7%, the chance of a day with mixed snow and rain remains an essentially constant 8% throughout, and the chance of a day with only snow increases from 9% to 17%.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Manson is decreasing, starting the month at 1.9 inches, when it rarely exceeds 3.8 inches or falls below 0.4 inches, and ending the month at 1.0 inches, when it rarely exceeds 2.2 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 Manson is gradually increasing, 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 1.3 inches, when it rarely exceeds 2.4 inches or falls below 0.2 inches.
The highest average 31-day liquid-equivalent accumulation is 1.3 inches on December 30.
Average Monthly Liquid-Equivalent Snowfall in December
Over the course of December in Manson, the length of the day is essentially constant. The shortest day of the month is December 21, with 8 hours, 23 minutes of daylight and the longest day is December 1, with 8 hours, 41 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Manson is 7:29 AM on December 1 and the latest sunrise is 21 minutes later at 7:50 AM on December 31.
The earliest sunset is 4:07 PM on December 11 and the latest sunset is 10 minutes later at 4:17 PM on December 31.
Daylight saving time is observed in Manson 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 5:01 AM and sets 16 hours, 2 minutes later, at 9:03 PM, while on December 21, the shortest day of the year, it rises at 7:47 AM and sets 8 hours, 23 minutes later, at 4:10 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Manson is essentially constant during December, remaining around 0% throughout.
For reference, on August 6, 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
The average hourly wind speed in Manson is essentially constant during December, remaining within 0.1 miles per hour of 4.1 miles per hour throughout.
For reference, on May 7, the windiest day of the year, the daily average wind speed is 5.3 miles per hour, while on January 6, the calmest day of the year, the daily average wind speed is 4.0 miles per hour.
Average Wind Speed in December
Wind Direction in December
The growing season in Manson typically lasts for 6.4 months (195 days), from around April 12 to around October 24, rarely starting before March 19 or after May 5, and rarely ending before October 6 or after November 11.
The month of December in Manson 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 Manson are essentially constant during December, remaining around 2,632°F throughout.
Growing Degree Days in December
The average daily incident shortwave solar energy in Manson is essentially constant during December, remaining within 0.1 kWh of 1.2 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 1.1 kWh on December 24.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Manson are 47.885 deg latitude, -120.158 deg longitude, and 1,306 ft elevation.
The topography within 2 miles of Manson contains very significant variations in elevation, with a maximum elevation change of 1,250 feet and an average elevation above sea level of 1,213 feet. Within 10 miles contains very significant variations in elevation (6,450 feet). Within 50 miles also contains extreme variations in elevation (9,964 feet).
The area within 2 miles of Manson is covered by water (43%), cropland (24%), and sparse vegetation (14%), within 10 miles by shrubs (50%) and grassland (18%), and within 50 miles by shrubs (44%) and trees (23%).
This report illustrates the typical weather in Manson 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 Manson.
For each station, the records are corrected for the elevation difference between that station and Manson 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 Manson is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Manson and a given station.
The stations contributing to this reconstruction are: Pangborn Field (57%, 54 kilometers, south); Omak Airport (32%, 80 kilometers, northeast); and Arlington Municipal Airport (12%, 152 kilometers, west).
Time zones for aiports and weather stations are provided by AskGeo.com .