December weather forecast
Washington, USA

December in Washington State ushers in the full embrace of winter, complete with colder temperatures and increased precipitation in the form of both rain and snow. In the western part of the state, cities like Vancouver and Olympia see average low temperatures plummet to 35°F (1.7°C). On the eastern side, cities such as Kennewick and Spokane experience nighttime lows ranging from 20°F (-6.7°C) to 25°F (-3.9°C).

Western Washington usually receives substantial rainfall, accumulating to approximately 5" (127mm) to 6" (152mm) (127 to 5.98" (152mm)). In contrast, eastern areas might see less than 2" (51mm) but are more prone to snowfall. Winds remain relatively steady, hovering between 5 to 15mph (24.1km/h) (8.05 to 15mph (24.1km/h)), although sporadic winter storms can cause gusts to spike.

December differs markedly from November by bringing a more significant risk of snowfall, especially in mountainous regions and eastern Washington. It marks the true onset of the winter season and the launch of winter sports like skiing and snowboarding in resorts across the state. January will continue the wintry trend with even colder temperatures, more frequent snow, and longer-lasting cloud cover. The shift into the new year solidifies the presence of winter, making December merely an opening act for the colder and snowier conditions to follow.

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• Seattle - December »
  With its average high temperature of 43.7°F (6.5°C) and a low of 35.1°F (1.7°C), December is regarded as the coldest month in Seattle. January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Seattle, Washington.
• Spokane - December »
  In Spokane during December, the rain falls for 9.6 days and regularly aggregates up to 2.09" (53mm) of precipitation. In Spokane, in December, during 15.6 snowfall days, 8.74" (222mm) of snow is typically accumulated.
• Tacoma - December »
  The month with the shortest days in Tacoma, Washington, is December, with an average of 8h and 36min of daylight. The month of December, characterized by an average high of 43.7°F (6.5°C) and a low of 34.3°F (1.3°C), is recognized as the coldest in Tacoma, Washington.
• Vancouver - December »
  The month with the most rainfall in Vancouver is December, when the rain falls for 19.6 days and typically aggregates up to 5.08" (129mm) of precipitation. In Vancouver during December, the rain falls for 19.6 days and regularly aggregates up to 5.08" (129mm) of precipitation.
• Bellevue - December »
  The month with the most rainfall in Bellevue is December, when the rain falls for 12.5 days and typically aggregates up to 2.01" (51mm) of precipitation. In Bellevue in December, snow falls for 1.1 days, with typically accumulated 0.31" (8mm) of snow.
• Kent - December »
  The month with the most rainfall in Kent is December, when the rain falls for 19 days and typically aggregates up to 4.76" (121mm) of precipitation. The months with the highest humidity in Kent are January, February and December, with an average relative humidity of 85%.
• Everett - December »
  January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Everett. In Everett, in December, snow falls for 1.5 days, with typically accumulated 0.51" (13mm) of snow.
• Renton - December »
  The month with the most rainfall in Renton is December, when the rain falls for 11.2 days and typically aggregates up to 1.34" (34mm) of precipitation. The months with the highest humidity in Renton are January and December, with an average relative humidity of 85%.
• Federal Way - December »
  The month with the most rainfall in Federal Way is December, when the rain falls for 18.2 days and typically aggregates up to 4.72" (120mm) of precipitation. The month with the shortest days in Federal Way, Washington, is December, with an average of 8h and 30min of daylight.
• Yakima - December »
  The month with the most snowfall in Yakima is December, when snow falls for 5.4 days and typically aggregates up to 2.76" (70mm) of snow. In Yakima, in December, during 5.4 snowfall days, 2.76" (70mm) of snow is typically accumulated.
• Kirkland - December »
  In Kirkland during December, the rain falls for 18.6 days and regularly aggregates up to 4.21" (107mm) of precipitation. In Kirkland in December, snow falls for 1.5 days, with typically accumulated 0.39" (10mm) of snow.
• Bellingham - December »
  Closing the annual cycle, December in Bellingham returns to the cold temperatures, shortened daylight, and significant precipitation that define the Washington winter. December has the shortest days of the year in Bellingham, Washington, with an average of 8h and 18min of daylight.