| | Clayton, MO | Edwardsville, IL | United States |
| Rainfall | 43.2 | 42.7 | 38.1 |
| Snowfall | 15.9 | 11.6 | 27.8 |
| Precipitation Days | 105 | 98.7 | 106.2 |
| Sunny | 204 | 204 | 205 |
| Avg. July High | 88.7 | 88.8 | 85.8 |
| Avg. Jan. Low | 23.1 | 22.4 | 21.7 |
| Comfort Index (higher=better) | 7.2 | 7.2 | 7 |
| UV Index | 4.3 | 4.1 | 4.3 |
| Elevation ft. | 564 | 541 | 2443 |