Grant County Climate
Grant County, Washington
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
51.7°F
Annual Precip
8.7"
Annual Snowfall
—
Extreme Heat Days
40
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7a
Minimum winter temperature range for plant survival
2,983
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Grant County
Climate Verdict
Grant County has a mild, with an average annual temperature of 51.7°F, arid conditions receiving just 8.7 inches of precipitation annually, occasional hot days — 39.9 per year above 90°F. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 30.4°F. summers are warm — July averages 74.6°F. The 44°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Grant County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Grant County closely matches the Washington statewide average temperature of 49.9°F, it is also noticeably drier, receiving 29.8 inches less precipitation than the state average, the county experiences 21.90723294723295 more extreme heat days than the state average.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.