| Waltham, MA | Gaithersburg, MD | United States |
Rainfall | 47.7 | 42.2 | 38.1 |
Snowfall | 50.2 | 21.4 | 27.8 |
Precipitation Days | 130.6 | 112.7 | 106.2 |
Sunny | 197 | 202 | 205 |
Avg. July High | 82.9 | 85.1 | 85.8 |
Avg. Jan. Low | 17.1 | 25 | 21.7 |
Comfort Index (higher=better) | 6.9 | 7.3 | 7 |
UV Index | 3.5 | 4.1 | 4.3 |
Elevation ft. | 66 | 502 | 2443 |