Benton County Climate
Benton County, Oregon
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
51.6°F
Annual Precip
51.1"
Annual Snowfall
4.1"
Extreme Heat Days
16
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8b
Minimum winter temperature range for plant survival
2,025
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Benton County
Climate Verdict
Benton County has a mild, with an average annual temperature of 51.6°F, moderately wet with 51.1 inches of annual precipitation, rare extreme heat with only 15.766666666666667 days above 90°F annually, light snow averaging 4.1 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 39.7°F. summers are pleasantly cool with July averaging 66.0°F. The climate is remarkably stable year-round, with only a 26°F difference between January and July. December is typically the coldest month and August the warmest.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Benton County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Benton County closely matches the Oregon statewide average temperature of 50.5°F, it is also noticeably wetter, receiving 13.7 inches more precipitation than the state average.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.