| | Joppatowne, MD | Kemp Mill, MD | United States |
| Rainfall | 44.6 | 43.5 | 38.1 |
| Snowfall | 18 | 14.4 | 27.8 |
| Precipitation Days | 117.5 | 109.5 | 106.2 |
| Sunny | 212 | 201 | 205 |
| Avg. July High | 88.1 | 87.5 | 85.8 |
| Avg. Jan. Low | 26.9 | 25.1 | 21.7 |
| Comfort Index (higher=better) | 7.3 | 7.3 | 7 |
| UV Index | 3.9 | 4.1 | 4.3 |
| Elevation ft. | 239 | 338 | 2443 |