King County's climate is mild and moderately moist; winters are comparatively warm with mild, temperate summers. The average summer temperature is 64 degrees, and temperatures climb over 90 degrees only a few days per year. During the winter, temperatures rarely drop below freezing (only 15 days per year). The area's wet season extends from October through April, during which 82% of annual rainfall occurs (about 35" a year). Heavy rainfall is rather rare; instead the area experiences a stable level of light rain throughout the winter.

Annual Precipitation in Inches