| | Clarksville, VA | Westphalia, MD | United States |
| Rainfall | 43.8 | 43.8 | 38.1 |
| Snowfall | 4.5 | 14.1 | 27.8 |
| Precipitation Days | 93.5 | 106.4 | 106.2 |
| Sunny | 216 | 203 | 205 |
| Avg. July High | 89.9 | 87.6 | 85.8 |
| Avg. Jan. Low | 27.1 | 24.1 | 21.7 |
| Comfort Index (higher=better) | 7.6 | 7.4 | 7 |
| UV Index | 4.7 | 4.3 | 4.3 |
| Elevation ft. | 354 | 177 | 2443 |