Climate change in Roosevelt County, Montana
Since 1979, Roosevelt County, Montana has warmed 0.7°F, with 1 fewer days above 90°F, about the same number of nights above 70°F and 12% more precipitation a year. Its climate in 1996–2025 is most like Dawson County, MT's was in 1951–1980.
- Average temperature: +0.7°F
- Summer highs (Jun–Aug): +0.6°F
- Winter lows (Dec–Feb): +2.0°F
- Precipitation: +12%
- Wettest day of the year: +10%
- Longest dry spell: −15 days
- Days above 90°F: −1 days
- Nights above 70°F: +0 days
- Freezing nights: −2 days
- Frost-free season: +10 days
- Muggy days: −1 days
- Summer heat index (Jun–Aug): +0.8°F
- Extreme fire-weather days: +5 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.