Climate change in McCook County, South Dakota
Since 1979, McCook County, South Dakota has warmed 1.8°F, with 5 fewer days above 90°F, 1 more nights above 70°F and 3% more precipitation a year. Its climate in 1996–2025 is most like Plymouth County, IA's was in 1951–1980.
- Average temperature: +1.8°F
- Summer highs (Jun–Aug): +0.5°F
- Winter lows (Dec–Feb): +2.8°F
- Precipitation: +3%
- Wettest day of the year: +30%
- Longest dry spell: −2 days
- Days above 90°F: −5 days
- Nights above 70°F: +1 days
- Freezing nights: −4 days
- Frost-free season: +12 days
- Muggy days: +10 days
- Summer heat index (Jun–Aug): +1.1°F
- Extreme fire-weather days: +11 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.