Umatilla County Climate
Umatilla County, Oregon
Avg Annual Temp
51.9°F
Annual Precip
15.2"
Annual Snowfall
29.9"
Extreme Heat Days
38.02
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Umatilla County Weather
A Typical But Dry National Profile
Umatilla County’s 51.9°F average temperature aligns closely with the national median. However, it is much drier than the U.S. average, receiving only 15.2 inches of precipitation.
Warmer and Snowier than the Average
At 51.9°F, the county is warmer than the Oregon state average of 50.5°F. It also receives 29.8 inches of snow, which is quite high compared to the rain-heavy western half of the state.
The Snowy Side of the Plateau
Umatilla is similar in temperature to Morrow County but receives nearly triple the snowfall. It averages 29.8 inches of snow compared to Morrow's 8.3 inches.
Intense Heat and Significant Snowfall
The county experiences 38 days of extreme heat above 90°F, one of the highest counts in the state. Winters bring a January average of 34.8°F and substantial snow accumulations.
Invest in Cooling and Clearing
Residents need high-efficiency cooling to manage over five weeks of extreme summer heat. A reliable snow blower or shovel is also essential for managing nearly 30 inches of winter snow.
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.