| | Adamstown, MD | Oakton, VA | United States |
| Rainfall | 42.4 | 42.7 | 38.1 |
| Snowfall | 20.7 | 21.5 | 27.8 |
| Precipitation Days | 107.9 | 117.8 | 106.2 |
| Sunny | 197 | 201 | 205 |
| Avg. July High | 87.5 | 85.7 | 85.8 |
| Avg. Jan. Low | 23.3 | 23.7 | 21.7 |
| Comfort Index (higher=better) | 7.3 | 7.3 | 7 |
| UV Index | 4.2 | 4 | 4.3 |
| Elevation ft. | 305 | 417 | 2443 |