Benton County Climate
Benton County, Washington
Avg Annual Temp
54.0°F
Annual Precip
7.9"
Annual Snowfall
—
Extreme Heat Days
41.775
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Benton County Weather
One of Washington's warmest, driest spots
Benton County's 53.9°F average temperature is higher than the national median. It is exceptionally dry, receiving only 7.9 inches of rain compared to the much higher national average.
Leading the state in summer heat
The county is significantly warmer than the Washington average of 49.9°F. Its 42 days of extreme heat far exceed what most residents in the state experience.
Hotter and drier than Adams County
Benton averages 53.9°F annually, making it warmer than neighboring Adams County. It also receives nearly four inches less rain per year than its neighbor to the northeast.
Scorching summers and mild winters
July brings an average temperature of 75.5°F, supported by 42 days of heat over 90°F. Winter remains relatively mild for the region, averaging 36.0°F.
Prioritize cooling and water storage
Central air conditioning is essential to handle the six weeks of extreme heat. With only 7.9 inches of rain, supplemental irrigation is necessary for any local gardening or agriculture.
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.