| Rockville, MD | Reston, VA | United States |
Rainfall | 42.2 | 42.7 | 38.1 |
Snowfall | 18.2 | 21.5 | 27.8 |
Precipitation Days | 112.3 | 117.9 | 106.2 |
Sunny | 203 | 197 | 205 |
Avg. July High | 84.8 | 85.5 | 85.8 |
Avg. Jan. Low | 25.1 | 23.5 | 21.7 |
Comfort Index (higher=better) | 7.4 | 7.3 | 7 |
UV Index | 4.1 | 4 | 4.3 |
Elevation ft. | 456 | 331 | 2443 |