Cool
Average highs are around 7°C, so pack for cooler days.
December verdict
Mount Vernon, Washington, United States in December
Weather score13Poor
Poor for holiday weather
Average highs are around 7°C, so pack for cooler days. Sunshine averages 1.7h per day, so this is not one of the brighter months. Rainfall averages 139mm, so some wet days are possible.
December weather
Monthly averages
Temp
7°C
Rain
139mm
Sun
1.7h
Weather score
13
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 139mm, so some wet days are possible.
Limited sun
Sunshine averages 1.7h per day, so this is not one of the brighter months.
Map
Weather map
Compare Mount Vernon, Washington, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
December7°C average high
December has some of the coolest average daytime highs of the year, so pack for fresher conditions.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
December139mm average rain
December is one of Mount Vernon's wettest months, so rain is likely to be a major planning factor.
Driest monthsMay to September
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
December1.7 hours average sun
December is one of Mount Vernon's cloudier months, so sunshine-led plans are less reliable.
Brightest monthsJune to August
This stretch has the strongest sunshine in the monthly averages.
Weather score
December13 weather score
December is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.
Best weather monthsJuly to August
These months have the strongest weather score in the monthly averages.
