Owyhee County Climate
Owyhee County, Idaho
Avg Annual Temp
49.7°F
Annual Precip
10.0"
Annual Snowfall
47.3"
Extreme Heat Days
41.08571428571429
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Owyhee County Weather
America's High Desert Frontier
Owyhee is a vast, dry frontier with a 49.7°F average temperature and only 10 inches of rain. This puts it among the driest counties in the United States.
Idaho's Driest Desert County
It is warmer than the Idaho average of 46.5°F but ranks as the driest county in the state. While rain is scarce, the county catches a robust 47.3 inches of snow annually.
Drier and Snowier than Boise
Owyhee is significantly drier and warmer than its northern neighbor, Ada County. However, its high-desert peaks catch far more snow (47.3 inches) than the nearby Treasure Valley.
Hot Summers, Cold Snowy Winters
Summers are hot with 41 days hitting 90°F or higher. Winters are moderately cold, averaging 32°F, though January nights can be particularly biting in the open desert.
Conserve Water and Drive 4WD
Water conservation is a way of life given the 10-inch annual precipitation limit. High-clearance vehicles are recommended for winter travel to navigate the 47-inch snowfall 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.