| WMO/ICAO ID | Name | MAE | RMSE | BIAS | maxE | minE | Cases |
|---|---|---|---|---|---|---|---|
| Illinois | 1.74 | 2.26 | -1.41 | 2.6 | -7.3 | 80 | |
| KBMI | Bloomington-Normal Airport | 0.95 | 1.06 | -0.22 | 1.3 | -1.3 | 4 |
| KMDW | Chicago Midway Airport | 3.54 | 4.39 | -3.54 | -1.0 | -7.3 | 4 |
| KORD | Chicago O´Hare Airport | 2.17 | 2.69 | -1.94 | 0.9 | -6.4 | 28 |
| KRFD | Chicago Rockford Airport | 1.60 | 1.87 | -1.24 | 2.6 | -3.9 | 28 |
| KDPA | Dupage Airport | 0.70 | 0.79 | -0.65 | 0.1 | -1.0 | 4 |
| KIGQ | Lansing Airport | 1.56 | 1.83 | 0.14 | 1.8 | -2.8 | 4 |
| KPIA | Peoria Airport | 1.22 | 1.46 | -1.22 | -0.4 | -2.3 | 4 |
| KSPI | Springfield Abraham Lincoln Airport | 0.55 | 0.87 | -0.53 | 0.0 | -1.7 | 4 |