King County Climate
King County, Washington
Avg Annual Temp
51.3°F
Annual Precip
64.2"
Annual Snowfall
24.7"
Extreme Heat Days
3.4499999999999997
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About King County Weather
A Mild Marine Climate
King County maintains an average annual temperature of 51.3°F, falling slightly below the national median. The region's temperate marine climate avoids the harsh temperature extremes found in much of the central United States.
Warmer Than the State Average
At 51.3°F, the county is warmer than the Washington state average of 49.9°F. Its 64.2 inches of annual precipitation also far exceeds the statewide average of 38.5 inches.
Drier Than Its Western Neighbors
King County receives 64.2 inches of rain, which is significantly less than the 83.3 inches seen in neighboring Mason County. However, it remains wetter than Kitsap County across the sound, which averages 56.9 inches.
Cool Summers and Damp Winters
The county experiences only 3 extreme heat days per year, with July temperatures averaging a mild 65.0°F. Winter brings 24.7 inches of snowfall and average lows near 40.1°F in January.
Prepare for Persistent Rain
High-quality waterproof gear is essential to handle the 64.2 inches of annual rainfall. While air conditioning is less critical given the few extreme heat days, residents should prepare for occasional winter snow accumulation.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.