Clackamas County Climate
Clackamas County, Oregon
Avg Annual Temp
51.3°F
Annual Precip
61.1"
Annual Snowfall
48.7"
Extreme Heat Days
11.224999999999998
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.