Jefferson County Climate
Jefferson County, Washington
Avg Annual Temp
50.9°F
Annual Precip
52.5"
Annual Snowfall
0.6"
Extreme Heat Days
2.3000000000000003
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Jefferson County Weather
Cool and Damp Peninsula Life
Jefferson County averages 50.9°F, reflecting a cool maritime climate that sits below the national median. It is a land of extremes, with 52.5 inches of annual rain concentrated in its rainforest regions.
Wetter Than the State Norm
The county is slightly warmer than the state average of 49.9°F and significantly wetter than the 38.5-inch state mean. Most of this moisture falls as rain rather than snow along the Olympic Peninsula.
Rainy Even by Coast Standards
Jefferson receives significantly more rain than Island County but only about half the deluge seen in Grays Harbor. Snow is almost non-existent at 0.6 inches, far less than the totals in Eastern Washington.
Mild Summers and Wet Winters
Summers are cool and pleasant, averaging 61.4°F with only 2 days of extreme heat. Winters are mild and damp, with a January average of 40.9°F keeping frost at bay.
Rain Gear Over Snow Gear
Waterproof gear is a daily necessity for the 52.5 inches of rain, though snow shovels are rarely required. Home heating needs are moderate, and air conditioning is an optional luxury rather than a requirement.
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.