Clark County Climate
Clark County, South Dakota
Avg Annual Temp
43.1°F
Annual Precip
23.2"
Annual Snowfall
22.0"
Extreme Heat Days
8.8
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Clark County Weather
Cold and Breezy Northern Interior
Clark County is one of the cooler spots in the nation, with an average annual temperature of 43.1°F. Its climate is characterized by mild summers and long, biting winters.
Well Below South Dakota Norms
Clark's 43.1°F average is significantly lower than the state's 45.6°F mark. While it is colder than average, its 23.2 inches of annual precipitation aligns closely with the state's 22.7-inch average.
Chilly Eastern South Dakota Climate
Clark shares a very similar climate with neighboring Codington County, which averages 42.9°F. Both counties see only 9 days of extreme heat per year, far fewer than the state's western counties.
Mild Summers and Deep Freezes
Summer heat is rare here, with July averaging 71.2°F and only 9 days hitting the 90°F mark. Winters are harsh, featuring a January average of just 12.3°F and 22 inches of snow.
Focus on High-Efficiency Heating
Homeowners should prioritize insulation and heating efficiency as winter temperatures average 15.7°F. Heavy summer cooling is rarely needed compared to the rest of the state.
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.