Walla Walla County Climate
Walla Walla County, Washington
Avg Annual Temp
53.3°F
Annual Precip
15.8"
Annual Snowfall
5.8"
Extreme Heat Days
41.06666666666667
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Walla Walla County Weather
A Warm and Sunny Eastern Hub
Walla Walla County’s average annual temperature of 53.3°F aligns closely with the national median. Its semi-arid climate offers significantly more warmth than the typical Washington profile.
One of Washington's Warmest Counties
With an average temperature of 53.3°F, this county is significantly warmer than the state average of 49.9°F. It represents the sunnier, drier side of the Cascade Range.
Drier and Hotter than Whitman
The county is quite dry, receiving just 15.8 inches of precipitation annually. It is warmer and sees far less snow than nearby Whitman County, which averages 25.6 inches of snowfall.
Intense Summer Heat and Moderate Winters
Residents endure 41 days of extreme heat above 90°F, with July averages reaching a balmy 74.4°F. Winters are comparatively mild for the region, averaging 36.5°F from December to February.
Plan for Long, Hot Summers
Central air conditioning and efficient irrigation are vital for the 41 days of extreme heat. With only 5.8 inches of snow, focus winter prep on insulation rather than heavy plowing equipment.
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.