Marion County Climate
Marion County, Oregon
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
52.7°F
Annual Precip
57.0"
Annual Snowfall
5.6"
Extreme Heat Days
12
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8b
Minimum winter temperature range for plant survival
2,275
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Marion County
Climate Verdict
Marion County has a mild, with an average annual temperature of 52.7°F, very wet conditions receiving 57.0 inches of precipitation annually, rare extreme heat with only 12.166666666666666 days above 90°F annually, light snow averaging 5.6 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 40.6°F. summers are pleasantly cool with July averaging 67.5°F. The climate is remarkably stable year-round, with only a 27°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 Marion County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Marion County closely matches the Oregon statewide average temperature of 50.5°F, it is also noticeably wetter, receiving 19.6 inches more precipitation than the state average.
Climate Profile
About Marion County Weather
A Mild Valley Climate Profile
Marion County's 52.7°F average annual temperature is almost perfectly aligned with the national median. This reflects the temperate, stable environment of the Willamette Valley.
Warmer and Wetter Than Oregon's Average
Marion is over two degrees warmer than the Oregon state average of 50.5°F. It also receives 57.0 inches of annual precipitation, significantly more than the 37.4-inch state average.
Similar to Lane, Warmer than Linn
Marion's 52.7°F average is nearly identical to Lane County. It is noticeably warmer than Linn County, which averages 49.5°F and sees more annual snowfall.
Consistent Rain and Moderate Summers
The county experiences only 12 days of extreme heat above 90°F, keeping summers pleasant at 65.4°F. Winters are mild at 41.1°F and see a light 5.6 inches of snow.
Prioritize Rain Gear and Indoor Air Quality
With 57 inches of rain, residents should focus on maintaining home seals and high-quality rain jackets. Extreme heat is rare, so heavy AC usage is typically limited to a few weeks.
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.