Columbia County Climate
Columbia County, Oregon
Avg Annual Temp
51.2°F
Annual Precip
48.3"
Annual Snowfall
1.7"
Extreme Heat Days
11.475
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Columbia County Weather
Mild Maritime River Valley Climate
Columbia County averages 51.2°F annually, placing it slightly below the national median temperature. It receives 48.3 inches of precipitation, making it significantly wetter than many parts of the United States.
Wetter Than the Oregon Average
The county's temperature of 51.2°F is very close to the state average of 50.5°F. However, its 48.3 inches of annual rain is roughly 11 inches higher than the state's typical precipitation level.
Moderate Seasonal Extremes for the Region
Columbia experiences 11 extreme heat days annually, similar to its neighbors in the northern Willamette Valley. Its winter average of 39.7°F is typical for the region, avoiding the deep freezes found in eastern Oregon.
Rainy Winters and Temperate Summers
July averages a pleasant 65.1°F, while January temperatures hover around 39.2°F. The county sees very little snow, averaging only 1.7 inches per year, with most precipitation falling as winter rain.
Prioritize Waterproofing and Drainage
Residents should focus on high-quality rain gear to navigate the 48 inches of annual precipitation. With only 11 days of extreme heat, most homes stay comfortable with moderate ventilation or standard cooling systems.
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.