| | Columbia, MD | Riverdale, GA | United States |
| Rainfall | 45 | 49.5 | 38.1 |
| Snowfall | 17.3 | 1.5 | 27.8 |
| Precipitation Days | 113.9 | 108.4 | 106.2 |
| Sunny | 212 | 214 | 205 |
| Avg. July High | 87.9 | 89.5 | 85.8 |
| Avg. Jan. Low | 23.9 | 32.6 | 21.7 |
| Comfort Index (higher=better) | 7.3 | 7.5 | 7 |
| UV Index | 3.9 | 5.1 | 4.3 |
| Elevation ft. | 404 | 922 | 2443 |