9 cities · avg annual temperature 10.5°C
| City | Population | Avg temp | Since 1900 |
|---|---|---|---|
| Philadelphia | 1,567,442 | 12.2°C | +1.9° |
| Pittsburgh | 304,391 | 10.7°C | +1.9° |
| Allentown | 120,207 | 10.4°C | +2.0° |
| Erie | 99,475 | 9.3°C | +2.0° |
| Reading | 87,879 | 10.7°C | +2.0° |
| Scranton | 77,118 | 7.9°C | +2.0° |
| Bethlehem | 74,892 | 10.4°C | +2.0° |
| Lancaster | 59,339 | 11.3°C | +2.0° |
| Levittown | 52,983 | 11.9°C | +1.9° |