Grant County Climate
Grant County, South Dakota
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
44.0°F
Annual Precip
25.4"
Annual Snowfall
32.2"
Extreme Heat Days
16
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
4b
Minimum winter temperature range for plant survival
2,630
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 cool, averaging 44.0°F annually, moderate rainfall of 25.4 inches per year, rare extreme heat with only 16 days above 90°F annually, moderate snowfall of 32.2 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 12.2°F. summers are warm — July averages 72.7°F. Residents experience a substantial 61°F difference between winter and summer.
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 South Dakota statewide average temperature of 45.6°F, it is somewhat wetter than average for South Dakota.
Climate Profile
About Grant County Weather
A Northern Climate with Moderate Heat
Grant County maintains an annual average temperature of 44.0°F, sitting well below the national median. This region experiences a humid continental climate that typically delivers cooler year-round conditions than much of the central United States.
Cooler than the South Dakota Average
The county's 44.0°F annual average makes it cooler than the South Dakota state average of 45.6°F. It receives 25.4 inches of annual precipitation, which is roughly 12% higher than the statewide average of 22.7 inches.
Wetter but Colder than Western Peers
While neighboring Hamlin County to the south is even colder at 41.7°F, Grant County stays slightly warmer during the winter months. Its 25.4 inches of precipitation exceeds the drier conditions found in counties further west like Hand or Hughes.
Frigid Winters Meet Mild Summers
Winter temperatures plummet to a January average of 12.2°F, supported by 32.2 inches of annual snowfall. Summers are comfortable with a July average of 72.7°F and only 16 days reaching 90°F or higher.
Prepare for Deep Winter Freezes
Residents need high-efficiency heating systems to combat winter lows that average 15.6°F from December through February. Standard snow removal equipment is essential for managing the 32.2 inches of snow that falls across the region.
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.