Whitman County Climate
Whitman County, Washington
Avg Annual Temp
48.9°F
Annual Precip
17.7"
Annual Snowfall
25.6"
Extreme Heat Days
27.46
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.