Climate change in Plymouth County, Massachusetts
Since 1979, Plymouth County, Massachusetts has warmed 3.3°F, with 5 more days above 90°F, 9 more nights above 70°F and 9% more precipitation a year. Its climate in 1996–2025 is most like Suffolk County, NY's was in 1951–1980.
- Average temperature: +3.3°F
- Summer highs (Jun–Aug): +2.6°F
- Winter lows (Dec–Feb): +4.8°F
- Precipitation: +9%
- Wettest day of the year: +20%
- Longest dry spell: −2 days
- Days above 90°F: +5 days
- Nights above 70°F: +9 days
- Freezing nights: −19 days
- Frost-free season: +34 days
- Muggy days: +9 days
- Summer heat index (Jun–Aug): +3.3°F
- Extreme fire-weather days: +11 days
- Snowfall: +13%
- 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.