| Stations: 20 | Humidity |
| Baker Airport (902 m) | 90 % |
| Bert Mooney Airport (1688 m) | 75 % |
| Billings Logan Intl. Airport (1088 m) | 50 % |
| Bozeman Yellowstone Intl. Airport (1349 m) | 75 % |
| Cut Bank Airport (1169 m) | 95 % |
| Dawson Community Airport (749 m) | 95 % |
| Dillon Airport (1597 m) | 60 % |
| Glasgow Airport (693 m) | 84 % |
| Great Falls (1131 m) | 86 % |
| Great Falls Intl. Airport (1116 m) | 80 % |
| Havre (792 m) | 90 % |
| Helena Regional Airport (1188 m) | 78 % |
| Jordan Airport (811 m) | 75 % |
| L. M. Clayton Airport (605 m) | 95 % |
| Lewistown Airport (1263 m) | 95 % |
| Malmstrom Air Force Base (1056 m) | 80 % |
| Miles City Airport (801 m) | 45 % |
| Mission Field (1418 m) | 60 % |
| Missoula Intl. Airport (972 m) | 50 % |
| Sidney-Richland Airport (605 m) | 95 % |