Jefferson County Climate
Jefferson County, Washington
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
50.9°F
Annual Precip
52.5"
Annual Snowfall
0.6"
Extreme Heat Days
2
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8b
Minimum winter temperature range for plant survival
1,632
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Jefferson County
Climate Verdict
Jefferson County has a mild, with an average annual temperature of 50.9°F, moderately wet with 52.5 inches of annual precipitation, rare extreme heat with only 2.3000000000000003 days above 90°F annually, light snow averaging 0.6 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 40.9°F. summers are pleasantly cool with July averaging 62.7°F. The climate is remarkably stable year-round, with only a 22°F difference between January and July. December is typically the coldest month and August the warmest.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Jefferson County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Jefferson County closely matches the Washington statewide average temperature of 49.9°F, it is also noticeably wetter, receiving 14.0 inches more precipitation than the state average, the county experiences 15.69276705276705 fewer extreme heat days than the state average.
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
What is the average temperature in Jefferson County?
How much rain does Jefferson County get?
Does it snow in Jefferson County?
How hot does Jefferson County get in summer?
How cold are winters in Jefferson County?
Track your own weather in Jefferson County
Ambient Weather personal weather stations give you hyperlocal climate data.
Sponsored
Data sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.