Cowlitz County Climate
Cowlitz County, Washington
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
53.2°F
Annual Precip
61.4"
Annual Snowfall
3.0"
Extreme Heat Days
10
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8b
Minimum winter temperature range for plant survival
2,268
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Cowlitz County
Climate Verdict
Cowlitz County has a mild, with an average annual temperature of 53.2°F, very wet conditions receiving 61.4 inches of precipitation annually, rare extreme heat with only 9.5 days above 90°F annually, light snow averaging 3.0 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 41.4°F. summers are pleasantly cool with July averaging 66.4°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 Cowlitz County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Cowlitz County is 3.3°F warmer than the Washington statewide average of 49.9°F, it is also noticeably wetter, receiving 22.9 inches more precipitation than the state average.
Climate Profile
About Cowlitz County Weather
A warm and exceptionally wet county
Cowlitz County's 53.2°F average temperature is near the national median. Its 61.4 inches of annual precipitation makes it one of the wettest regions in the country.
One of Washington's wettest, warmest areas
The county is significantly warmer and wetter than the state averages of 49.9°F and 38.5 inches. It ranks high for total annual rainfall in Washington.
Wetter than Clark and Clallam counties
With 61.4 inches of rain, Cowlitz outpaces both Clark (44 inches) and Clallam (58.7 inches). It maintains a mild temperature that mirrors its southern neighbors.
Mild winters and damp, cool summers
Summer averages 64.8°F with 10 days of heat over 90°F. Winter is notably mild at 41.8°F, seeing only 3.0 inches of snow despite heavy overall precipitation.
Focus on moisture and mold prevention
Dehumidifiers and waterproof home coatings are essential for managing 61.4 inches of rain. Outdoor gear should prioritize breathability to handle the mild but constant dampness.
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.