Columbia County Climate
Columbia County, Washington
Avg Annual Temp
51.1°F
Annual Precip
18.8"
Annual Snowfall
15.8"
Extreme Heat Days
31
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Columbia County Weather
Moderate temperatures with an arid lean
Columbia County's average temperature of 51.1°F is slightly below the national median. With 18.8 inches of annual rain, it is drier than the average U.S. county.
Warmer than the average Washington county
The county's 51.1°F average exceeds the state average of 49.9°F. However, it receives less than half the precipitation typically seen across Washington.
More snow than neighboring Asotin
Columbia records 15.8 inches of snow, about five inches more than neighbor Asotin County. It shares the hot, dry summer profile typical of the Walla Walla region.
Hot summers meet snowy winters
Residents face 31 days of heat over 90°F during the 68.4°F average summer. Winter brings a cooling shift to 34.9°F with a reliable 15.8 inches of snow.
Prepare for a true four-season climate
Effective cooling is necessary for the 31 days of extreme summer heat. Winter preparations should include snow tires for the 15.8 inches of annual snowfall.
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.