Grant County Climate
Grant County, Oregon
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
47.7°F
Annual Precip
14.6"
Annual Snowfall
21.4"
Extreme Heat Days
40
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
1,983
Favors cool-season crops
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 cool, averaging 47.7°F annually, arid conditions receiving just 14.6 inches of precipitation annually, occasional hot days — 40.371428571428574 per year above 90°F, moderate snowfall of 21.4 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 31.1°F. summers are pleasantly cool with July averaging 67.9°F. The 37°F seasonal variation provides noticeable but manageable change. December is typically the coldest month and July the warmest.
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 Oregon statewide average temperature of 50.5°F, it is also noticeably drier, receiving 22.9 inches less precipitation than the state average, the county experiences 17.033514147889154 more extreme heat days than the state average.
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 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.