Snohomish County Climate
Snohomish County, Washington
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
50.6°F
Annual Precip
54.1"
Annual Snowfall
3.6"
Extreme Heat Days
5
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8b
Minimum winter temperature range for plant survival
1,762
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Snohomish County
Climate Verdict
Snohomish County has a mild, with an average annual temperature of 50.6°F, moderately wet with 54.1 inches of annual precipitation, rare extreme heat with only 4.583333333333333 days above 90°F annually, light snow averaging 3.6 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 39.1°F. summers are pleasantly cool with July averaging 64.1°F. The climate is remarkably stable year-round, with only a 25°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 Snohomish County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Snohomish County closely matches the Washington statewide average temperature of 49.9°F, it is also noticeably wetter, receiving 15.6 inches more precipitation than the state average.
Climate Profile
About Snohomish County Weather
Temperate and Consistently Moist
Snohomish County maintains an average annual temperature of 50.6°F, sitting just below the national median. With 54.1 inches of annual precipitation, the climate is characterized by frequent cloud cover and rain.
Slightly Warmer than the Washington Average
The 50.6°F annual average is slightly higher than the state's 49.9°F mean. Its 54.1 inches of rain puts it well above the state average of 38.5 inches, typical for the Puget Sound region.
Drier and Less Snowy than Pierce County
Snohomish County is significantly less snowy than Pierce County, receiving only 3.6 inches of snow compared to 38.3 inches. It also sees slightly less annual rainfall than its southern neighbor.
Mild Summers with Minimal Snowfall
July temperatures average 64.1°F with only 5 days of extreme heat above 90°F. Winters are mild but wet, with January averages around 39.1°F and very little frozen precipitation.
Focus on Reliable Rain Gear
With only 5 days of extreme heat, cooling is less critical than moisture management. Residents should prioritize high-quality rain shells and ensure home gutters are clear to handle the consistent annual rainfall.
Frequently Asked Questions
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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.