Grant County Climate
Grant County, Washington
Avg Annual Temp
51.7°F
Annual Precip
8.7"
Annual Snowfall
—
Extreme Heat Days
39.9
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Grant County Weather
Washington's Desert Heart
Grant County averages 51.7°F, sitting just below the national median but featuring a much drier profile. It is a desert environment, receiving only 8.7 inches of annual precipitation.
Heat Leader in the State
The county is nearly two degrees warmer than the Washington average of 49.9°F. Its precipitation is among the lowest in the state, falling far short of the 38.5-inch state average.
Hotter Than Nearby Counties
Grant is the hottest of its neighbors, enduring 40 days of extreme heat compared to Douglas County’s 34. While snowfall data is limited, its July average of 74.6°F makes it a regional heat leader.
Extreme Heat and Dry Cold
Summers are characterized by intense heat, with 40 days hitting 90°F and a July peak of 74.6°F. Winters are cold but dry, averaging 32.1°F from December through February.
Beat the Desert Heat
Extreme heat is the primary concern, making high-performance cooling systems a necessity for the 40 days of 90°F+ weather. Low-water landscaping is the only sustainable choice given the sparse 8.7 inches of annual rain.
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.