Clay County Climate
Clay County, South Dakota
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
47.6°F
Annual Precip
27.4"
Annual Snowfall
30.5"
Extreme Heat Days
23
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
2,991
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Clay County
Climate Verdict
Clay County has a cool, averaging 47.6°F annually, moderate rainfall of 27.4 inches per year, occasional hot days — 23.45 per year above 90°F, moderate snowfall of 30.5 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 18.6°F. summers are warm — July averages 73.7°F. Residents experience a substantial 55°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Clay County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Clay County closely matches the South Dakota statewide average temperature of 45.6°F, it is somewhat wetter than average for South Dakota.
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 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.