Climate change in Westmoreland County, Pennsylvania
Since 1979, Westmoreland County, Pennsylvania has warmed 2.6°F, with 1 more days above 90°F, about the same number of nights above 70°F and 18% more precipitation a year. Its climate in 1996–2025 is most like Fayette County, WV's was in 1951–1980.
- Average temperature: +2.6°F
- Summer highs (Jun–Aug): +0.8°F
- Winter lows (Dec–Feb): +4.3°F
- Precipitation: +18%
- Wettest day of the year: +32%
- Longest dry spell: −1 days
- Days above 90°F: +1 days
- Nights above 70°F: +0 days
- Freezing nights: −17 days
- Frost-free season: +19 days
- Muggy days: +8 days
- Summer heat index (Jun–Aug): +1.1°F
- Extreme fire-weather days: +14 days
- Snowfall: +8%
- Snowy days (1 inch or more): −6 days
Changes follow the trend line through every year from 1979 to 2025. Data: NOAA nClimGrid-Daily; humidity from gridMET, adjusted to airport observations.