Roberts County Climate
Roberts County, South Dakota
Avg Annual Temp
43.2°F
Annual Precip
24.9"
Annual Snowfall
48.6"
Extreme Heat Days
10.34
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Roberts County Weather
One of the Nation's Coldest Corners
Roberts County's annual average of 43.2°F is significantly lower than the national median. The county experiences long, rigorous winters typical of the northeastern plains.
A Cold and Snowy State Outlier
At 43.2°F, Roberts County is one of the colder counties in South Dakota, falling well below the 45.6°F state average. It also sees 48.6 inches of snow, much higher than the state median.
More Snow and Less Heat Than Neighbors
Roberts County records 48.6 inches of snow, nearly double the amount seen in Sanborn. It also stays cooler in the summer, with only 10 days hitting 90°F compared to the 26 days in Perkins.
Harsh Winters and Pleasant Summers
The winter average of 15.5°F makes for a long cold season, dominated by nearly 49 inches of snowfall. Summers are relatively mild, with July averaging 70.9°F and very few extreme heat events.
Focusing on High-Efficiency Winter Heating
With January averages of just 12.1°F, high-quality home heating and insulation are the top priorities. Residents should also prepare for significant snow clearance for the nearly 50 inches of annual accumulation.
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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.