| | Mattoon, IL | Clarksville, TN | United States |
| Rainfall | 39.5 | 51 | 38.1 |
| Snowfall | 15.7 | 4.7 | 27.8 |
| Precipitation Days | 111.7 | 117 | 106.2 |
| Sunny | 201 | 210 | 205 |
| Avg. July High | 86 | 89.4 | 85.8 |
| Avg. Jan. Low | 20.1 | 26.5 | 21.7 |
| Comfort Index (higher=better) | 7.2 | 7.3 | 7 |
| UV Index | 4.1 | 4.5 | 4.3 |
| Elevation ft. | 735 | 476 | 2443 |