| | Covina, CA | Rock Hill, SC | United States |
| Rainfall | 18.3 | 43.8 | 38.1 |
| Snowfall | 0 | 2.6 | 27.8 |
| Precipitation Days | 35.9 | 99.3 | 106.2 |
| Sunny | 288 | 212 | 205 |
| Avg. July High | 87.9 | 90.8 | 85.8 |
| Avg. Jan. Low | 43.8 | 30.5 | 21.7 |
| Comfort Index (higher=better) | 9.1 | 7.5 | 7 |
| UV Index | 6.2 | 4.8 | 4.3 |
| Elevation ft. | 558 | 676 | 2443 |