Climate change in Delaware County, Pennsylvania
Since 1979, Delaware County, Pennsylvania has warmed 3.5°F, with 8 more days above 90°F, 19 more nights above 70°F and 6% more precipitation a year. Its climate in 1996–2025 is most like Talbot County, MD's was in 1951–1980.
- Average temperature: +3.5°F
- Summer highs (Jun–Aug): +2.2°F
- Winter lows (Dec–Feb): +5.1°F
- Precipitation: +6%
- Wettest day of the year: +18%
- Longest dry spell: −0 days
- Days above 90°F: +8 days
- Nights above 70°F: +19 days
- Freezing nights: −23 days
- Frost-free season: +22 days
- Muggy days: +12 days
- Summer heat index (Jun–Aug): +3.2°F
- Extreme fire-weather days: +10 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.