Clackamas County Climate
Clackamas County, Oregon
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
51.3°F
Annual Precip
61.1"
Annual Snowfall
48.7"
Extreme Heat Days
11
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8b
Minimum winter temperature range for plant survival
2,074
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Clackamas County
Climate Verdict
Clackamas County has a mild, with an average annual temperature of 51.3°F, very wet conditions receiving 61.1 inches of precipitation annually, rare extreme heat with only 11.224999999999998 days above 90°F annually, moderate snowfall of 48.7 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 39.3°F. summers are pleasantly cool with July averaging 65.8°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
Winter sports enthusiasts benefit from reliable snow cover for 3-4 months annually.
Regional Context
Clackamas County closely matches the Oregon statewide average temperature of 50.5°F, it is also noticeably wetter, receiving 23.7 inches more precipitation than the state average.
Climate Profile
About Clackamas County Weather
A Temperate Climate With Mountain Influence
Clackamas County averages 51.3°F annually, sitting just below the national median temperature. It is a wet region, receiving 61.1 inches of precipitation per year, far exceeding the typical American county average.
Higher Precipitation Than State Norms
The county's average temperature closely tracks the state average of 50.5°F, but its 61.1 inches of rain nearly doubles the statewide average of 37.4 inches. This high rainfall is driven by the county's proximity to the Cascade Range.
Snowy Mountains and Mild Valleys
Clackamas stands out from neighboring valley counties with a high average snowfall of 48.7 inches, primarily occurring in its mountainous eastern half. Despite the mountain snow, the lower elevations share the mild 40°F winter averages of the Portland metro area.
Cool Summers and Snowy Winters
Summers are comfortable with a 63.8°F average and only 11 days of extreme heat annually. Winter brings a mix of rain and significant snow, with temperatures in January averaging 39.3°F.
Be Ready for Varied Conditions
Residents need versatile gear to handle both 61 inches of rain and nearly 49 inches of snowfall. Homeowners should prioritize roof inspections and drainage to manage the heavy annual precipitation and winter snow loads.
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.