| | Darien, CT | Waltham, MA | United States |
| Rainfall | 50.8 | 47.7 | 38.1 |
| Snowfall | 29.9 | 50.2 | 27.8 |
| Precipitation Days | 123.7 | 130.6 | 106.2 |
| Sunny | 175 | 197 | 205 |
| Avg. July High | 83.6 | 82.9 | 85.8 |
| Avg. Jan. Low | 21.1 | 17.1 | 21.7 |
| Comfort Index (higher=better) | 7.1 | 6.9 | 7 |
| UV Index | 3.4 | 3.5 | 4.3 |
| Elevation ft. | 49 | 66 | 2443 |