| | Vienna, MD | East New Market, MD | United States |
| Rainfall | 44.9 | 45.5 | 38.1 |
| Snowfall | 5.8 | 8 | 27.8 |
| Precipitation Days | 100.7 | 107.7 | 106.2 |
| Sunny | 211 | 207 | 205 |
| Avg. July High | 89.2 | 89.3 | 85.8 |
| Avg. Jan. Low | 28.5 | 28.2 | 21.7 |
| Comfort Index (higher=better) | 7.5 | 7.4 | 7 |
| UV Index | 4.2 | 4.2 | 4.3 |
| Elevation ft. | 13 | 39 | 2443 |