| | Custer, SD | Fort Madison, IA | United States |
| Rainfall | 19.9 | 39.3 | 38.1 |
| Snowfall | 55.3 | 21.3 | 27.8 |
| Precipitation Days | 93 | 107.6 | 106.2 |
| Sunny | 226 | 204 | 205 |
| Avg. July High | 79.5 | 86.3 | 85.8 |
| Avg. Jan. Low | 15.5 | 16.7 | 21.7 |
| Comfort Index (higher=better) | 6.7 | 7 | 7 |
| UV Index | 4.7 | 3.8 | 4.3 |
| Elevation ft. | 5315 | 525 | 2443 |