| | Sullivan, IL | Mount Zion, IL | United States |
| Rainfall | 40.6 | 40 | 38.1 |
| Snowfall | 12.3 | 11.8 | 27.8 |
| Precipitation Days | 101.3 | 100.7 | 106.2 |
| Sunny | 194 | 201 | 205 |
| Avg. July High | 85.8 | 86.9 | 85.8 |
| Avg. Jan. Low | 18.8 | 18.7 | 21.7 |
| Comfort Index (higher=better) | 7.2 | 7.2 | 7 |
| UV Index | 4 | 3.9 | 4.3 |
| Elevation ft. | 673 | 692 | 2443 |