December weather forecast and climate
Washington, USA

Flag of Washington, USA
Flag of Washington, USA

Weather in December

December is the wettest month of the year in Washington with an average of 6.5" (165mm) of rainfall in the state. The winter is severely cold, with gray skies, ample rain, and abundant snow.
The average high temperatures are in the 31°F (-0.6°C) to 41°F (5°C) range, and the average low temperatures are in the 20°F (-6.7°C) to 30°F (-1.1°C) zone. Winthrop is one of the coldest places in the eastern part, with average temperatures in the 14°F (-10°C) to 29°F (-1.7°C) zone. The coastal regions are warmer than the rest due to proximity to the Pacific Ocean.
Lower slopes of the Cascade Mountains record 15" (381mm) to 20" (508mm) of snowfall, while higher ones report 100" (2540mm) and above. Sunny days are few and far between, with mild sunshine at the most.
Long Beach sees few tourists with 12" (305mm) of rainfall. However, the snow depth makes skiing one of the most popular activities in December in Washington. Expect the cold and precipitation to last for long periods.
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