| | Collinsville, IL | Cahokia, IL | United States |
| Rainfall | 42.9 | 42.2 | 38.1 |
| Snowfall | 12.9 | 14.9 | 27.8 |
| Precipitation Days | 101.5 | 104.8 | 106.2 |
| Sunny | 199 | 202 | 205 |
| Avg. July High | 89.1 | 88.5 | 85.8 |
| Avg. Jan. Low | 22 | 22.6 | 21.7 |
| Comfort Index (higher=better) | 7.2 | 7.2 | 7 |
| UV Index | 4.1 | 4.1 | 4.3 |
| Elevation ft. | 561 | 407 | 2443 |