Gregory County Climate
Gregory County, South Dakota
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
47.5°F
Annual Precip
26.3"
Annual Snowfall
41.1"
Extreme Heat Days
28
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
2,866
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Gregory County
Climate Verdict
Gregory County has a cool, averaging 47.5°F annually, moderate rainfall of 26.3 inches per year, occasional hot days — 27.549999999999997 per year above 90°F, moderate snowfall of 41.1 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 20.9°F. summers are warm — July averages 74.2°F. Residents experience a substantial 53°F difference between winter and summer.
Outdoor & Gardening Guidance
Winter sports enthusiasts benefit from reliable snow cover for 3-4 months annually.
Regional Context
Gregory 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 Gregory County Weather
Mild Annual Temps Near the Missouri River
Gregory County's 47.5°F annual average temperature reflects a continental climate with significant seasonal variation. While cooler than the national median, it represents one of the milder pockets in the northern plains.
Warmer and Wetter than State Norms
The county averages 47.5°F annually, outpacing the South Dakota state average of 45.6°F. Residents also see more moisture, with 26.3 inches of annual precipitation compared to the statewide average of 22.7 inches.
Temperatures Align with Central Neighbors
Gregory County shares similar heat profiles with nearby Haakon County, though it receives significantly more moisture. While Haakon struggles with 18.7 inches of rain, Gregory enjoys a more robust 26.3 inches annually.
Sweltering Summers and Snowy Winters
The region faces 28 extreme heat days per year where temperatures top 90°F, peaking with a July average of 74.2°F. Winter remains demanding, delivering 41.1 inches of snowfall and a January average of 20.9°F.
Heavy Snow and Heat Protection Needed
Strong air conditioning is vital for the four weeks of extreme summer heat. Homeowners should also invest in durable roofing and insulation to handle the heavy 41.1-inch annual snow load.
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.