Gregory County Climate
Gregory County, South Dakota
Avg Annual Temp
47.5°F
Annual Precip
26.3"
Annual Snowfall
41.1"
Extreme Heat Days
27.549999999999997
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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.
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.