| | Irmo, SC | Hagerstown, MD | United States |
| Rainfall | 44.8 | 40.7 | 38.1 |
| Snowfall | 0.9 | 24.5 | 27.8 |
| Precipitation Days | 103.3 | 119.3 | 106.2 |
| Sunny | 222 | 198 | 205 |
| Avg. July High | 93 | 86 | 85.8 |
| Avg. Jan. Low | 30.3 | 21.9 | 21.7 |
| Comfort Index (higher=better) | 7.2 | 7.2 | 7 |
| UV Index | 4.9 | 3.9 | 4.3 |
| Elevation ft. | 358 | 541 | 2443 |