| St. Charles, MO | Chantilly, VA | United States |
Rainfall | 42 | 43 | 38 |
Snowfall | 14 | 22 | 28 |
Precipitation | 106 | 120 | 106 |
Sunny | 202 | 197 | 205 |
Avg. July High | 88 | 86 | 86 |
Avg. Jan. Low | 21 | 24 | 22 |
Comfort Index (higher=better) | 7.2 | 7.3 | 7 |
UV Index | 4.4 | 4 | 4.3 |
Elevation | 492 | 325 | 2443 |