| | Groton, MA | Purcellville, VA | United States |
| Rainfall | 47.3 | 42.1 | 38.1 |
| Snowfall | 56.5 | 21.3 | 27.8 |
| Precipitation Days | 126.4 | 115 | 106.2 |
| Sunny | 200 | 195 | 205 |
| Avg. July High | 83.3 | 86.4 | 85.8 |
| Avg. Jan. Low | 14 | 21 | 21.7 |
| Comfort Index (higher=better) | 6.7 | 7.2 | 7 |
| UV Index | 3.5 | 4 | 4.3 |
| Elevation ft. | 331 | 561 | 2443 |