| | Tyngsborough, MA | Ashburn, VA | United States |
| Rainfall | 47.1 | 42 | 38.1 |
| Snowfall | 56 | 21.5 | 27.8 |
| Precipitation Days | 119.7 | 116.4 | 106.2 |
| Sunny | 200 | 197 | 205 |
| Avg. July High | 82.9 | 86.9 | 85.8 |
| Avg. Jan. Low | 13.5 | 22.8 | 21.7 |
| Comfort Index (higher=better) | 6.8 | 7.2 | 7 |
| UV Index | 3.5 | 4 | 4.3 |
| Elevation ft. | 138 | 295 | 2443 |