Climate change in Hamlin County, South Dakota
Since 1979, Hamlin County, South Dakota has warmed 1.9°F, with 3 fewer days above 90°F, about the same number of nights above 70°F and 13% more precipitation a year. Its climate in 1996–2025 is most like Cottonwood County, MN's was in 1951–1980.
- Average temperature: +1.9°F
- Summer highs (Jun–Aug): +0.6°F
- Winter lows (Dec–Feb): +3.2°F
- Precipitation: +13%
- Wettest day of the year: +7%
- Longest dry spell: −3 days
- Days above 90°F: −3 days
- Nights above 70°F: +0 days
- Freezing nights: −9 days
- Frost-free season: +15 days
- Muggy days: +8 days
- Summer heat index (Jun–Aug): +1.3°F
- Extreme fire-weather days: +3 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.