Climate change in Yellowstone County, Montana
Since 1979, Yellowstone County, Montana has warmed 1.3°F, with 10 more days above 90°F, about the same number of nights above 70°F and 22% more precipitation a year. Its climate in 1996–2025 is most like Banner County, NE's was in 1951–1980.
- Average temperature: +1.3°F
- Summer highs (Jun–Aug): +1.7°F
- Winter lows (Dec–Feb): +1.9°F
- Precipitation: +22%
- Wettest day of the year: +35%
- Longest dry spell: −1 days
- Days above 90°F: +10 days
- Nights above 70°F: +0 days
- Freezing nights: −10 days
- Frost-free season: +16 days
- Muggy days: +0 days
- Summer heat index (Jun–Aug): +1.6°F
- Extreme fire-weather days: +12 days
- Snowfall: +2%
- Snowy days (1 inch or more): +1 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.