Lewis County Climate
Lewis County, Washington
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
51.2°F
Annual Precip
53.2"
Annual Snowfall
12.9"
Extreme Heat Days
12
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8a
Minimum winter temperature range for plant survival
1,944
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Lewis County
Climate Verdict
Lewis County has a mild, with an average annual temperature of 51.2°F, moderately wet with 53.2 inches of annual precipitation, rare extreme heat with only 11.58 days above 90°F annually, light snow averaging 12.9 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 65.5°F. The climate is remarkably stable year-round, with only a 26°F difference between January and July. December is typically the coldest month and July the warmest.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Lewis County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Lewis County closely matches the Washington statewide average temperature of 49.9°F, it is also noticeably wetter, receiving 14.7 inches more precipitation than the state average.
Climate Profile
About Lewis County Weather
A Classic Temperate Profile
Lewis County's 51.2°F average temperature is very close to national medians. It experiences a balanced mix of mild temperatures and significant annual rainfall.
Warmer and Wetter Than Average
The county is slightly warmer than the 49.9°F state average. Its 53.2 inches of annual precipitation is significantly higher than the Washington average of 38.5 inches.
Moderate Compared to Coastal Neighbors
Lewis County's 53.2 inches of rain is heavy, but it is much drier than Mason County's 83.3 inches. It also sees more extreme heat than King County, with 12 days versus King's 3.
Consistent Rain and Mild Snow
Winters feature a January average of 39.1°F and 12.9 inches of snowfall. Summers are pleasant with a 65.5°F July average, though 12 days usually exceed 90°F.
Manage Moisture and Moderate Heat
With 53.2 inches of rain, moisture control in homes is a top priority for residents. Preparing for 12 days of extreme heat also makes basic cooling systems a wise investment.
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.