Columbia County Climate
Columbia County, Oregon
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
51.2°F
Annual Precip
48.3"
Annual Snowfall
1.7"
Extreme Heat Days
11
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
8b
Minimum winter temperature range for plant survival
1,936
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Columbia County
Climate Verdict
Columbia County has a mild, with an average annual temperature of 51.2°F, moderately wet with 48.3 inches of annual precipitation, rare extreme heat with only 11.475 days above 90°F annually, light snow averaging 1.7 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 39.2°F. summers are pleasantly cool with July averaging 65.1°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 Columbia County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Columbia County closely matches the Oregon statewide average temperature of 50.5°F, it is also noticeably wetter, receiving 10.9 inches more precipitation than the state average.
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 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.