Pennsylvania has an average annual temperature of
51.8°F
(across all 35 cities) with approximately
1102 mm of annual precipitation
and average humidity of 79%.
The warmest city is Downingtown
with average July highs of 95.9°F,
while Scranton
is the coldest with average January lows of -2.7°F.
This page covers 45 years of NASA POWER climate data (1981–2025)
including temperature, rainfall, humidity, wind speed, and solar radiation.
Jul is typically the warmest month across Pennsylvania with average highs around
93.4°F, while
Jan is the coldest with average lows near
3.2°F.
Jul is the wettest month with approximately
112 mm of rainfall on average.
This chart shows how Pennsylvania's average temperatures have shifted across 45 years.
Use the range buttons to focus on recent decades or view the full historical record.
Data is averaged across all 35 cities in the state.
🌧️ Annual Precipitation Trend
State-wide avg annual precipitation · Last 10 years · mm/year
🔗 Explore Cities in Pennsylvania
Browse detailed weather history, monthly averages, and 45-year climate trends for every city in Pennsylvania.
Doylestown is the wettest city in Pennsylvania with approximately 1188 mm of annual precipitation on average. View Doylestown weather history →
What is the warmest month in Pennsylvania?▼
Jul is the warmest month across Pennsylvania, with state-wide average highs of 93.4°F and average lows of 53.8°F.
How many cities in Pennsylvania have weather data?▼
TownPillar has historical weather data for 35 cities in Pennsylvania, covering 45 years of NASA POWER climate records from 1981 to 2025.
Which month has the most sunshine in Pennsylvania?▼
Jul is the sunniest month across Pennsylvania with an average solar radiation of 5.90 kWh/m²/day state-wide. This solar radiation data from NASA POWER is useful for solar energy planning, agriculture, and understanding seasonal sunshine availability.
Where does this climate data come from?▼
All data is sourced from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis data. It includes monthly temperature, precipitation, humidity, wind speed, and solar radiation at 0.5° × 0.625° spatial resolution.
📚 Data Source
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources). Data covers 45 years (1981–2025) across 35 cities in Pennsylvania at monthly temporal resolution.