Whitman County Climate
Whitman County, Washington
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
48.9°F
Annual Precip
17.7"
Annual Snowfall
25.6"
Extreme Heat Days
27
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
2,110
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Whitman County
Climate Verdict
Whitman County has a cool, averaging 48.9°F annually, semi-arid conditions with only 17.7 inches of annual precipitation, occasional hot days — 27.46 per year above 90°F, moderate snowfall of 25.6 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 32.0°F. summers are pleasantly cool with July averaging 68.5°F. The 37°F seasonal variation provides noticeable but manageable change. December is typically the coldest month and July the warmest.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Whitman County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Whitman County closely matches the Washington statewide average temperature of 49.9°F, it is also noticeably drier, receiving 20.8 inches less precipitation than the state average.
Climate Profile
About Whitman County Weather
Colder Continental Weather in Whitman
Whitman County averages 48.9°F annually, making it notably cooler than the national median. This region features a continental climate with distinct, sharp seasonal shifts.
Chillier than the Washington Average
At 48.9°F, Whitman County sits a full degree below the Washington state average of 49.9°F. Its inland location removes the moderating effects of the Pacific Ocean.
Wetter and Snowier than Yakima
Whitman receives 17.7 inches of precipitation and 25.6 inches of snow annually. This makes it significantly wetter and snowier than Yakima County’s 8.1 inches of rain.
Hot Summers and Freezing Januarys
The county experiences 27 extreme heat days annually, yet January temperatures average a cold 32.0°F. Summer averages hover at 65.9°F, providing a break between the seasonal extremes.
Insulate for the Winter Chill
Robust home insulation is necessary to combat the 32.7°F winter average and 25.6 inches of snow. Residents should also maintain AC units to handle the month of extreme summer heat.
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.