| | Herrin, IL | Harrisburg, IL | United States |
| Rainfall | 45.5 | 48.5 | 38.1 |
| Snowfall | 11.8 | 8.2 | 27.8 |
| Precipitation Days | 97.6 | 102.2 | 106.2 |
| Sunny | 206 | 197 | 205 |
| Avg. July High | 87.7 | 87.5 | 85.8 |
| Avg. Jan. Low | 22.9 | 22.4 | 21.7 |
| Comfort Index (higher=better) | 7.2 | 7.3 | 7 |
| UV Index | 4.1 | 4.1 | 4.3 |
| Elevation ft. | 417 | 394 | 2443 |