Climate change in Lancaster County, Pennsylvania
Since 1979, Lancaster County, Pennsylvania has warmed 2.9°F, with 3 more days above 90°F, 11 more nights above 70°F and 12% more precipitation a year. Its climate in 1996–2025 is most like Harford County, MD's was in 1951–1980.
- Average temperature: +2.9°F
- Summer highs (Jun–Aug): +1.9°F
- Winter lows (Dec–Feb): +4.2°F
- Precipitation: +12%
- Wettest day of the year: +32%
- Longest dry spell: +0 days
- Days above 90°F: +3 days
- Nights above 70°F: +11 days
- Freezing nights: −18 days
- Frost-free season: +22 days
- Muggy days: +11 days
- Summer heat index (Jun–Aug): +2.4°F
- Extreme fire-weather days: +8 days
- Snowfall: +3%
- 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.