| | Brookeville, MD | North Potomac, MD | United States |
| Rainfall | 43.5 | 41.9 | 38.1 |
| Snowfall | 15.8 | 19.1 | 27.8 |
| Precipitation Days | 112.4 | 113.8 | 106.2 |
| Sunny | 202 | 201 | 205 |
| Avg. July High | 87.1 | 84.9 | 85.8 |
| Avg. Jan. Low | 24.9 | 24.6 | 21.7 |
| Comfort Index (higher=better) | 7.3 | 7.3 | 7 |
| UV Index | 4.1 | 4.1 | 4.3 |
| Elevation ft. | 436 | 256 | 2443 |