| | Old Lyme, CT | Simsbury, CT | United States |
| Rainfall | 47.8 | 52.6 | 38.1 |
| Snowfall | 25.9 | 36.5 | 27.8 |
| Precipitation Days | 117.8 | 119.6 | 106.2 |
| Sunny | 194 | 190 | 205 |
| Avg. July High | 79.7 | 83.7 | 85.8 |
| Avg. Jan. Low | 22.6 | 16.9 | 21.7 |
| Comfort Index (higher=better) | 7.2 | 7 | 7 |
| UV Index | 3.3 | 3.3 | 4.3 |
| Elevation ft. | 20 | 180 | 2443 |