| | Petersburg, IL | Plymouth, IL | United States |
| Rainfall | 37.8 | 39.9 | 38.1 |
| Snowfall | 17 | 20.2 | 27.8 |
| Precipitation Days | 102.2 | 95.7 | 106.2 |
| Sunny | 200 | 201 | 205 |
| Avg. July High | 85.1 | 86.9 | 85.8 |
| Avg. Jan. Low | 18.3 | 15.6 | 21.7 |
| Comfort Index (higher=better) | 7.2 | 7.1 | 7 |
| UV Index | 3.9 | 3.8 | 4.3 |
| Elevation ft. | 512 | 650 | 2443 |