Climate change in Gallatin County, Montana
Since 1979, Gallatin County, Montana has warmed 2.4°F, with 1 more days above 90°F, about the same number of nights above 70°F and 4% less precipitation a year. Its climate in 1996–2025 is most like Lewis and Clark County, MT's was in 1951–1980.
- Average temperature: +2.4°F
- Summer highs (Jun–Aug): +3.2°F
- Winter lows (Dec–Feb): +3.0°F
- Precipitation: −4%
- Wettest day of the year: −33%
- Longest dry spell: −4 days
- Days above 90°F: +1 days
- Nights above 70°F: +0 days
- Freezing nights: −10 days
- Frost-free season: +14 days
- Muggy days: +0 days
- Summer heat index (Jun–Aug): +3.0°F
- Extreme fire-weather days: +13 days
- Snowfall: +20%
- Snowy days (1 inch or more): +4 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.