Grays Harbor County Climate
Grays Harbor County, Washington
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
50.6°F
Annual Precip
100.3"
Annual Snowfall
0.5"
Extreme Heat Days
3
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8b
Minimum winter temperature range for plant survival
1,504
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Grays Harbor County
Climate Verdict
Grays Harbor County has a mild, with an average annual temperature of 50.6°F, very wet conditions receiving 100.3 inches of precipitation annually, rare extreme heat with only 2.7714285714285714 days above 90°F annually, light snow averaging 0.5 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 41.3°F. summers are pleasantly cool with July averaging 61.4°F. The climate is remarkably stable year-round, with only a 20°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 Grays Harbor County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Grays Harbor County closely matches the Washington statewide average temperature of 49.9°F, it is also noticeably wetter, receiving 61.8 inches more precipitation than the state average, the county experiences 15.221338481338478 fewer extreme heat days than the state average.
Climate Profile
About Grays Harbor County Weather
Temperate and Exceptionally Wet
Grays Harbor County averages 50.6°F, which is cool compared to the national median but typical for a Pacific maritime climate. Its defining feature is the massive 100.3 inches of annual rainfall.
Triple the State Rainfall
While its temperature is near the state average of 49.9°F, its precipitation is nearly triple the Washington average of 38.5 inches. It is one of the wettest environments in the entire United States.
Maritime Mildness Over Snow
It is vastly wetter than inland counties like Grant or Douglas, which receive less than 10% of Grays Harbor's rain. Snow is rare here, with only 0.5 inches annually compared to the heavy drifts found eastward.
Mild Summers and Wet Winters
Summer is exceptionally mild, averaging just 60.2°F with only 3 days of extreme heat. Winters are wet and temperate, staying well above freezing with a 41.4°F average.
Built for the Rain
High-quality rain gear and moisture-resistant building materials are essential to handle over 100 inches of rain. Air conditioning is rarely needed, as temperatures almost never hit the 90°F mark.
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.