Fall River County Climate
Fall River County, South Dakota
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
47.1°F
Annual Precip
17.8"
Annual Snowfall
38.6"
Extreme Heat Days
44
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
2,549
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Fall River County
Climate Verdict
Fall River County has a cool, averaging 47.1°F annually, semi-arid conditions with only 17.8 inches of annual precipitation, occasional hot days — 44.06 per year above 90°F, moderate snowfall of 38.6 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 23.8°F. summers are warm — July averages 72.9°F. The 49°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Fall River County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Fall River County closely matches the South Dakota statewide average temperature of 45.6°F, it is also noticeably drier, receiving 5.0 inches less precipitation than the state average, the county experiences 20.530303418803424 more extreme heat days than the state average.
Climate Profile
About Fall River County Weather
Hot, Dry, and Sun-Drenched
Fall River County averages 47.1°F annually, staying below the national median but ranking high for the region. Its semi-arid climate is characterized by low precipitation and hot summer afternoons.
A Heat Leader in South Dakota
The county is notably warmer than the 45.6°F state average. It ranks as one of the hottest spots in South Dakota during the peak of summer, driven by its southwestern location.
Significantly Drier than Neighbors
With only 17.8 inches of rain, this is one of the driest counties in the state compared to the 22.7-inch average. This dryness contributes to a staggering 44 days of heat above 90°F each year.
Intense Heat and Milder Winters
Summers are long and hot, though January is surprisingly mild for the state at 23.8°F. The 38.6 inches of snowfall is manageable due to the county's relatively warm winter average of 25.1°F.
Water Conservation is Key
Efficient air conditioning is a must for the 44 days of extreme summer heat. Gardeners should focus on xeriscaping to account for the low 17.8 inches of annual rain and high evaporation rates.
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.