| | Mount Vernon, VA | Culpeper, VA | United States |
| Rainfall | 42.6 | 44 | 38.1 |
| Snowfall | 14 | 19.3 | 27.8 |
| Precipitation Days | 116.7 | 116.5 | 106.2 |
| Sunny | 199 | 198 | 205 |
| Avg. July High | 88.6 | 86.5 | 85.8 |
| Avg. Jan. Low | 27.3 | 22.2 | 21.7 |
| Comfort Index (higher=better) | 7.4 | 7.3 | 7 |
| UV Index | 4 | 4.3 | 4.3 |
| Elevation ft. | 79 | 423 | 2443 |