| | Joliet, IL | Mattoon, IL | United States |
| Rainfall | 39 | 39.5 | 38.1 |
| Snowfall | 27.7 | 15.7 | 27.8 |
| Precipitation Days | 124.6 | 111.7 | 106.2 |
| Sunny | 186 | 201 | 205 |
| Avg. July High | 84.3 | 86 | 85.8 |
| Avg. Jan. Low | 16 | 20.1 | 21.7 |
| Comfort Index (higher=better) | 6.9 | 7.2 | 7 |
| UV Index | 3.7 | 4.1 | 4.3 |
| Elevation ft. | 541 | 735 | 2443 |