| | Seymour, CT | Gaithersburg, MD | United States |
| Rainfall | 51.5 | 42.2 | 38.1 |
| Snowfall | 37.1 | 21.4 | 27.8 |
| Precipitation Days | 114.1 | 112.7 | 106.2 |
| Sunny | 206 | 202 | 205 |
| Avg. July High | 84.1 | 85.1 | 85.8 |
| Avg. Jan. Low | 19.4 | 25 | 21.7 |
| Comfort Index (higher=better) | 7.1 | 7.3 | 7 |
| UV Index | 3.5 | 4.1 | 4.3 |
| Elevation ft. | 92 | 502 | 2443 |