| | Hummelstown, PA | Greenbelt, MD | United States |
| Rainfall | 41.8 | 43.4 | 38.1 |
| Snowfall | 25.7 | 13.2 | 27.8 |
| Precipitation Days | 122 | 108.7 | 106.2 |
| Sunny | 194 | 199 | 205 |
| Avg. July High | 85.1 | 87.9 | 85.8 |
| Avg. Jan. Low | 22.4 | 24.1 | 21.7 |
| Comfort Index (higher=better) | 7.2 | 7.3 | 7 |
| UV Index | 4.1 | 4.3 | 4.3 |
| Elevation ft. | 384 | 161 | 2443 |