Bon Homme County Climate
Bon Homme County, South Dakota
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
47.3°F
Annual Precip
26.2"
Annual Snowfall
36.6"
Extreme Heat Days
26
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
2,941
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Bon Homme County
Climate Verdict
Bon Homme County has a cool, averaging 47.3°F annually, moderate rainfall of 26.2 inches per year, occasional hot days — 25.7 per year above 90°F, moderate snowfall of 36.6 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 18.8°F. summers are warm — July averages 74.4°F. Residents experience a substantial 56°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Bon Homme County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Bon Homme 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 Bon Homme County Weather
Mild Temperatures on the State Border
Bon Homme County averages 47.3°F annually, trailing the national median of 53°F but ranking high for its latitude. It is one of the state's wetter areas, receiving 26.2 inches of annual precipitation.
Consistently Above the State Average
At 1.7 degrees above the state average of 45.6°F, Bon Homme is among the warmest counties in South Dakota. Its proximity to the Missouri River helps influence these more moderate temperature readings.
Wetter Than the Central Prairies
With 26.2 inches of precipitation, the county is much wetter than neighbors like Buffalo County, which sees only 20.1 inches. It also receives 36.6 inches of snow, which is slightly below the state mean.
Warm Summers and Brisk Januarys
July brings an average of 74.4°F and 26 days of extreme heat over 90°F. January is brisk at 18.8°F, creating a wide seasonal range typical of the upper Midwest.
Managing Humidity and Summer Heat
Residents should invest in powerful AC units to handle the humid summers and 26 days of extreme heat. Standard winter maintenance is required for the 36.6 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.