Benton County Climate
Benton County, Oregon
Avg Annual Temp
51.6°F
Annual Precip
51.1"
Annual Snowfall
4.1"
Extreme Heat Days
15.766666666666667
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Benton County Weather
Mild Willamette Valley Weather Patterns
Benton County maintains an average annual temperature of 51.6°F, slightly cooler than the national median. The region receives a robust 51.1 inches of rain annually, characterizing it as a temperate maritime-influenced zone.
Warmer and Wetter Than the Oregon Average
Benton is slightly warmer than the state average of 50.5°F and significantly wetter than the 37.4-inch state precipitation average. This combination supports the lush, green landscapes of the mid-Willamette Valley.
Moderate Temperatures Compared to Neighbors
Benton enjoys moderate extremes, seeing only 16 days above 90°F compared to the higher heat counts in southern Oregon. Its winter average of 40.2°F remains much milder than the cold winters found in the state's eastern counties.
Rainy Winters and Pleasant Summers
The county sees a rainy January averaging 39.7°F, while snowfall remains minimal at just 4.1 inches per year. Summers are gentle, with July temperatures averaging 66.0°F and relatively few extreme heat events.
Invest in Quality Rain Gear
With over 51 inches of annual precipitation, waterproof clothing and gutter maintenance are priorities for local residents. While extreme heat is rare, having a portable cooling solution for the 16 annual hot days ensures summer comfort.
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.