| | Northfield, IL | Carol Stream, IL | United States |
| Rainfall | 36.4 | 37.9 | 38.1 |
| Snowfall | 35.9 | 30.5 | 27.8 |
| Precipitation Days | 125.3 | 119 | 106.2 |
| Sunny | 189 | 187 | 205 |
| Avg. July High | 83.1 | 85.3 | 85.8 |
| Avg. Jan. Low | 16.7 | 13.6 | 21.7 |
| Comfort Index (higher=better) | 6.9 | 6.8 | 7 |
| UV Index | 3.6 | 3.4 | 4.3 |
| Elevation ft. | 633 | 758 | 2443 |