Douglas County Climate
Douglas County, South Dakota
Avg Annual Temp
48.9°F
Annual Precip
25.4"
Annual Snowfall
34.4"
Extreme Heat Days
33.3
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Douglas County Weather
Warmer Temps in the Heartland
Douglas County is one of South Dakota's warmer spots with an average of 48.9°F, though still cooler than the national median. The county experiences a robust continental climate with significant summer heat.
A Warm Outlier in South Dakota
The county sits more than 3 degrees above the state average of 45.6°F. This makes it one of the warmest counties in South Dakota, particularly during the peak of the growing season.
Higher Heat and Moderate Moisture
Compared to its neighbors, Douglas is both warmer and wetter, receiving 25.4 inches of precipitation annually. This moisture supports 33 days of extreme heat where temperatures top 90°F.
Hot July and Milder Winters
July is hot with an average of 75.0°F, while January stays relatively mild for the state at 20.9°F. The 34.4 inches of annual snowfall is lower than many northern South Dakota counties.
Prepare for High Cooling Demands
Residents should prepare for high energy demands in July and August to combat the 33 days of 90-degree weather. Winter requires less snow removal than northern neighbors, but heating remains a vital utility.
Frequently Asked Questions
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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.