Yankton County Climate
Yankton County, South Dakota
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
48.7°F
Annual Precip
28.7"
Annual Snowfall
38.1"
Extreme Heat Days
33
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
3,169
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Yankton County
Climate Verdict
Yankton County has a cool, averaging 48.7°F annually, moderate rainfall of 28.7 inches per year, occasional hot days — 32.8 per year above 90°F, moderate snowfall of 38.1 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 20.2°F. summers are warm — July averages 75.4°F. Residents experience a substantial 55°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Yankton County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Yankton County is 3.1°F warmer than the South Dakota statewide average of 45.6°F, it is also noticeably wetter, receiving 5.9 inches more precipitation than the state average.
Climate Profile
About Yankton County Weather
Temperate and Humid for the Plains
Yankton County averages 48.7°F annually, making it one of the more temperate areas in South Dakota. Its 28.7 inches of precipitation is significantly higher than most regional peers.
Warmer and Wetter Than Average
Yankton exceeds the state average temperature of 45.6°F and the state precipitation average of 22.7 inches. This combination makes it one of the most productive agricultural counties.
The Wettest of the Comparison Group
With 28.7 inches of annual precipitation, Yankton is much wetter than Stanley or Walworth. This extra moisture supports a lush landscape compared to the drier western plains.
Humid Summers and Snowy Winters
July is warm at 75.4°F with 33 days of extreme heat per year. Winter is manageable but active, featuring a 20.2°F January average and 38.1 inches of snow.
Plan for High Summer Humidity
Dehumidification and high-capacity cooling are essential for the 73.1°F summer months. Prepare for varied winter weather that regularly drops nearly 40 inches of total snow.
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.