Climate change in New Haven County, Connecticut
Since 1979, New Haven County, Connecticut has warmed 2.7°F, with 1 more days above 90°F, 5 more nights above 70°F and 6% less precipitation a year. Its climate in 1996–2025 is most like Bergen County, NJ's was in 1951–1980.
- Average temperature: +2.7°F
- Summer highs (Jun–Aug): +1.7°F
- Winter lows (Dec–Feb): +3.9°F
- Precipitation: −6%
- Wettest day of the year: −11%
- Longest dry spell: −1 days
- Days above 90°F: +1 days
- Nights above 70°F: +5 days
- Freezing nights: −14 days
- Frost-free season: +25 days
- Muggy days: +11 days
- Summer heat index (Jun–Aug): +2.6°F
- Extreme fire-weather days: +9 days
- Snowfall: +85%
- 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.