| | Accokeek, MD | Clinton, MD | United States |
| Rainfall | 42.9 | 43.8 | 38.1 |
| Snowfall | 15.3 | 15.3 | 27.8 |
| Precipitation Days | 109.5 | 108.4 | 106.2 |
| Sunny | 202 | 205 | 205 |
| Avg. July High | 87 | 87.6 | 85.8 |
| Avg. Jan. Low | 27.8 | 25.5 | 21.7 |
| Comfort Index (higher=better) | 7.5 | 7.4 | 7 |
| UV Index | 4.3 | 4.3 | 4.3 |
| Elevation ft. | 194 | 249 | 2443 |