| Great Falls, VA | Chantilly, VA | United States |
Rainfall | 42.4 | 42.9 | 38.1 |
Snowfall | 21.5 | 21.5 | 27.8 |
Precipitation Days | 116.3 | 119.5 | 106.2 |
Sunny | 196 | 197 | 205 |
Avg. July High | 85.8 | 85.8 | 85.8 |
Avg. Jan. Low | 23.5 | 23.5 | 21.7 |
Comfort Index (higher=better) | 7.3 | 7.3 | 7 |
UV Index | 4 | 4 | 4.3 |
Elevation ft. | 344 | 325 | 2443 |