| Naperville, IL | Chantilly, VA | United States |
Rainfall | 39 | 43 | 38 |
Snowfall | 29 | 22 | 28 |
Precipitation | 120 | 120 | 106 |
Sunny | 189 | 197 | 205 |
Avg. July High | 84 | 86 | 86 |
Avg. Jan. Low | 15 | 24 | 22 |
Comfort Index (higher=better) | 6.9 | 7.3 | 7 |
UV Index | 3.4 | 4 | 4.3 |
Elevation | 709 | 325 | 2443 |