| Frederick, MD | Naperville, IL | United States |
Rainfall | 43 | 39 | 38 |
Snowfall | 23 | 29 | 28 |
Precipitation | 107 | 120 | 106 |
Sunny | 200 | 189 | 205 |
Avg. July High | 88 | 84 | 86 |
Avg. Jan. Low | 23 | 15 | 22 |
Comfort Index (higher=better) | 7.3 | 6.9 | 7 |
UV Index | 4.2 | 3.4 | 4.3 |
Elevation | 282 | 709 | 2443 |