Grant County Climate
Grant County, South Dakota
Avg 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
Seasonal Overview
National Comparison
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.
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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.