| | Westford, MA | Winchester, MA | United States |
| Rainfall | 48 | 47 | 38 |
| Snowfall | 56 | 53 | 28 |
| Precipitation | 128 | 135 | 106 |
| Sunny | 199 | 200 | 205 |
| Avg. July High | 83 | 82 | 86 |
| Avg. Jan. Low | 15 | 19 | 22 |
| Comfort Index (higher=better) | 6.8 | 6.9 | 7 |
| UV Index | 3.5 | 3.5 | 4.3 |
| Elevation | 397 | 20 | 2443 |