Clay County Climate
Clay County, South Dakota
Avg Annual Temp
47.6°F
Annual Precip
27.4"
Annual Snowfall
30.5"
Extreme Heat Days
23.45
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Clay County Weather
Moderate and Moist Plains Climate
Clay County averages 47.6°F annually, placing it among the warmer regions of South Dakota. It also receives 27.4 inches of precipitation, which is higher than many other Great Plains counties.
Warmer and Wetter Than Average
Clay County exceeds the state average temperature of 45.6°F by two degrees. It is also significantly wetter than the 22.7-inch state average, receiving nearly five extra inches of rain and snow.
Lower Heat Than Southern Neighbors
Clay's 47.6°F average is slightly cooler than Charles Mix County at 48.8°F. Clay also experiences 10 fewer extreme heat days annually than Charles Mix, making for slightly milder summers.
Distinct Seasons with Humidity
Summers are warm with a July average of 73.7°F and 23 days over 90°F. Winter brings 30.5 inches of snow, though January averages stay relatively mild for the state at 18.6°F.
Managing Moisture and Winter Ice
With 27.4 inches of precipitation, basement waterproofing and gutter maintenance are essential for homeowners. Winter tires are recommended to navigate the 30.5 inches of annual snowfall.
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.