Clark County Climate
Clark County, South Dakota
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
43.1°F
Annual Precip
23.2"
Annual Snowfall
22.0"
Extreme Heat Days
9
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
4b
Minimum winter temperature range for plant survival
2,402
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Clark County
Climate Verdict
Clark County has a cool, averaging 43.1°F annually, semi-arid conditions with only 23.2 inches of annual precipitation, rare extreme heat with only 8.8 days above 90°F annually, moderate snowfall of 22.0 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 12.3°F. summers are warm — July averages 71.2°F. Residents experience a substantial 59°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Clark County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Clark County closely matches the South Dakota statewide average temperature of 45.6°F.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.