| | Dedham, MA | District Heights, MD | United States |
| Rainfall | 48.6 | 44.1 | 38.1 |
| Snowfall | 46.7 | 13.4 | 27.8 |
| Precipitation Days | 126.7 | 109.8 | 106.2 |
| Sunny | 201 | 200 | 205 |
| Avg. July High | 83.1 | 87.6 | 85.8 |
| Avg. Jan. Low | 17.5 | 24.3 | 21.7 |
| Comfort Index (higher=better) | 7 | 7.3 | 7 |
| UV Index | 3.5 | 4.3 | 4.3 |
| Elevation ft. | 108 | 269 | 2443 |