Climate change in Jefferson County, Idaho
Since 1979, Jefferson County, Idaho has warmed 2.7°F, with 25 more days above 90°F, about the same number of nights above 70°F and 23% less precipitation a year. Its climate in 1996–2025 is most like Minidoka County, ID's was in 1951–1980.
- Average temperature: +2.7°F
- Summer highs (Jun–Aug): +5.2°F
- Winter lows (Dec–Feb): +2.6°F
- Precipitation: −23%
- Wettest day of the year: −9%
- Longest dry spell: +2 days
- Days above 90°F: +25 days
- Nights above 70°F: +0 days
- Freezing nights: −13 days
- Frost-free season: +19 days
- Muggy days: +0 days
- Summer heat index (Jun–Aug): +4.6°F
- Extreme fire-weather days: +17 days
- Snowfall: +7%
- Snowy days (1 inch or more): −2 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.