| | Merrifield, VA | Point of Rocks, MD | United States |
| Rainfall | 42.7 | 42.5 | 38.1 |
| Snowfall | 21.3 | 19.7 | 27.8 |
| Precipitation Days | 116.7 | 112.1 | 106.2 |
| Sunny | 202 | 197 | 205 |
| Avg. July High | 86.2 | 87.6 | 85.8 |
| Avg. Jan. Low | 24.2 | 23.1 | 21.7 |
| Comfort Index (higher=better) | 7.3 | 7.3 | 7 |
| UV Index | 4 | 4.2 | 4.3 |
| Elevation ft. | 361 | 249 | 2443 |