| | Alton, IL | Olney, IL | United States |
| Rainfall | 41.7 | 45 | 38.1 |
| Snowfall | 15.5 | 12.3 | 27.8 |
| Precipitation Days | 104.2 | 109 | 106.2 |
| Sunny | 200 | 202 | 205 |
| Avg. July High | 88.7 | 86.5 | 85.8 |
| Avg. Jan. Low | 22.7 | 20.3 | 21.7 |
| Comfort Index (higher=better) | 7.2 | 7.1 | 7 |
| UV Index | 4.1 | 4.4 | 4.3 |
| Elevation ft. | 495 | 479 | 2443 |