| | Rock Hill, SC | Elkridge, MD | United States |
| Rainfall | 43.8 | 42.5 | 38.1 |
| Snowfall | 2.6 | 16.9 | 27.8 |
| Precipitation Days | 99.3 | 113.6 | 106.2 |
| Sunny | 212 | 207 | 205 |
| Avg. July High | 90.8 | 86.7 | 85.8 |
| Avg. Jan. Low | 30.5 | 23.8 | 21.7 |
| Comfort Index (higher=better) | 7.5 | 7.3 | 7 |
| UV Index | 4.8 | 3.9 | 4.3 |
| Elevation ft. | 676 | 95 | 2443 |