| | Mars, PA | Rockford, IL | United States |
| Rainfall | 39.8 | 37.1 | 38.1 |
| Snowfall | 38.5 | 35.1 | 27.8 |
| Precipitation Days | 157.7 | 116 | 106.2 |
| Sunny | 164 | 188 | 205 |
| Avg. July High | 82.3 | 83.7 | 85.8 |
| Avg. Jan. Low | 20.3 | 12.7 | 21.7 |
| Comfort Index (higher=better) | 6.8 | 6.8 | 7 |
| UV Index | 3.5 | 3.5 | 4.3 |
| Elevation ft. | 1037 | 718 | 2443 |