| | Irmo, SC | Willow Grove, PA | United States |
| Rainfall | 44.8 | 47.8 | 38.1 |
| Snowfall | 0.9 | 17.4 | 27.8 |
| Precipitation Days | 103.3 | 108.9 | 106.2 |
| Sunny | 222 | 203 | 205 |
| Avg. July High | 93 | 85.3 | 85.8 |
| Avg. Jan. Low | 30.3 | 24.1 | 21.7 |
| Comfort Index (higher=better) | 7.2 | 7.3 | 7 |
| UV Index | 4.9 | 4.1 | 4.3 |
| Elevation ft. | 358 | 269 | 2443 |