Minnehaha County Climate
Minnehaha County, South Dakota
Avg Annual Temp
46.3°F
Annual Precip
28.5"
Annual Snowfall
42.5"
Extreme Heat Days
12.75
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Minnehaha County Weather
A Colder Climate Than the National Median
Minnehaha County maintains an annual average temperature of 46.3°F, falling significantly below the national median of roughly 54°F. The region operates within a humid continental climate, balancing cold winters with warm, humid summers.
Warmer and Wetter Than the State Average
The county's average temperature of 46.3°F sits slightly above the South Dakota state average of 45.6°F. It also receives 28.5 inches of annual precipitation, which is nearly 6 inches more than the statewide average of 22.7 inches.
The Regional Leader in Annual Precipitation
Compared to more arid western counties like Oglala Lakota, Minnehaha receives over 10 inches more precipitation annually. Its 28.5 inches of moisture makes it one of the wetter pockets in the eastern Dakotas.
Sweeping Temperature Shifts Across the Year
Residents face a stark contrast between a 16.6°F January and a 73.0°F July average. While the county sees 13 extreme heat days over 90°F, it must also manage a significant 42.5 inches of annual snowfall.
Preparing for Significant Winter Snowfall
Homeowners should invest in high-capacity snow removal equipment to handle the 42.5 inches of snow each year. Robust insulation is essential to maintain comfort during the winter months where temperatures average just 19.7°F.
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.