Climate change in Norfolk County, Massachusetts
Since 1979, Norfolk County, Massachusetts has warmed 3.5°F, with 9 more days above 90°F, 6 more nights above 70°F and 7% more precipitation a year. Its climate in 1996–2025 is most like Westchester County, NY's was in 1951–1980.
- Average temperature: +3.5°F
- Summer highs (Jun–Aug): +2.9°F
- Winter lows (Dec–Feb): +5.0°F
- Precipitation: +7%
- Wettest day of the year: +8%
- Longest dry spell: −4 days
- Days above 90°F: +9 days
- Nights above 70°F: +6 days
- Freezing nights: −20 days
- Frost-free season: +27 days
- Muggy days: +10 days
- Summer heat index (Jun–Aug): +4.0°F
- Extreme fire-weather days: +13 days
- Snowfall: +16%
- Snowy days (1 inch or more): −0 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.