Union County Climate
Union County, Oregon
Avg Annual Temp
48.8°F
Annual Precip
20.6"
Annual Snowfall
12.8"
Extreme Heat Days
30.333333333333332
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Union County Weather
Cooler Temperatures in the Blue Mountains
Union County averages 48.8°F annually, making it cooler than the national median. The region receives a modest 20.6 inches of precipitation, balancing mountain moisture with inland aridity.
Colder and Drier Than State Norms
The county's 48.8°F average falls below the Oregon state average of 50.5°F. It receives roughly 17 inches less precipitation than the state average of 37.4 inches.
Milder Than Wallowa's High Peaks
Union County is about 3 degrees warmer on average than neighboring Wallowa County. While it receives 12.8 inches of snow, it is significantly less than Wallowa's 51-inch average.
Hot July Days and Freezing Winters
The county sees 30 days of extreme heat each year, with July temperatures averaging 68.5°F. Winter is cold, with a January average of 32.1°F and frequent frost.
Prepare for Wide Seasonal Swings
A versatile wardrobe is necessary to handle a 30-day heat season and 12.8 inches of winter snow. Homeowners should ensure pipes are well-insulated against the 32.1°F January average.
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.