| | Groton, MA | Harpers Ferry, WV | United States |
| Rainfall | 47.3 | 40.3 | 38.1 |
| Snowfall | 56.5 | 19.8 | 27.8 |
| Precipitation Days | 126.4 | 114.8 | 106.2 |
| Sunny | 200 | 201 | 205 |
| Avg. July High | 83.3 | 86.1 | 85.8 |
| Avg. Jan. Low | 14 | 21.3 | 21.7 |
| Comfort Index (higher=better) | 6.7 | 7.3 | 7 |
| UV Index | 3.5 | 3.9 | 4.3 |
| Elevation ft. | 331 | 489 | 2443 |