Climate change in Granite County, Montana
Since 1979, Granite County, Montana has warmed 3.0°F, with about the same number of days above 90°F, about the same number of nights above 70°F and 13% less precipitation a year. Its climate in 1996–2025 is most like Lewis and Clark County, MT's was in 1951–1980.
- Average temperature: +3.0°F
- Summer highs (Jun–Aug): +3.8°F
- Winter lows (Dec–Feb): +3.7°F
- Precipitation: −13%
- Wettest day of the year: −25%
- Longest dry spell: +5 days
- Days above 90°F: +0 days
- Nights above 70°F: +0 days
- Freezing nights: −16 days
- Frost-free season: +15 days
- Muggy days: +0 days
- Summer heat index (Jun–Aug): +3.8°F
- Extreme fire-weather days: +15 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.