Grant County Climate
Grant County, Oregon
Avg Annual Temp
47.7°F
Annual Precip
14.6"
Annual Snowfall
21.4"
Extreme Heat Days
40.371428571428574
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Grant County Weather
Cool Temps with High Summer Peaks
Grant County's annual average temperature of 47.7°F is cooler than the national median. It is a dry region, receiving only 14.6 inches of precipitation annually compared to the national average.
Cooler than the State Average
The county's 47.7°F average sits below the Oregon state average of 50.5°F. Its precipitation level is also significantly lower, with 14.6 inches against the state's 37.4-inch average.
Warmer and Drier than Harney
Grant County is slightly warmer than neighboring Harney County, which averages 46.4°F. It is also more arid than many western counties, reflecting its position in the rugged interior of the state.
High Heat Spikes and Moderate Snow
Despite a cool annual average, the county experiences a significant 40 days of extreme heat above 90°F. Winter brings a January average of 31.1°F and a total of 21.4 inches of snowfall.
Prepare for Extreme Summer Heat
With 40 days of heat over 90°F, residents must have reliable cooling systems and heat safety plans. Winter preparation should include equipment to manage the 21.4 inches of snow that falls annually.
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.