| | Cabin John, MD | Atlanta, GA | United States |
| Rainfall | 43.5 | 51.5 | 38.1 |
| Snowfall | 14.3 | 1.4 | 27.8 |
| Precipitation Days | 112.8 | 109.3 | 106.2 |
| Sunny | 202 | 217 | 205 |
| Avg. July High | 88.6 | 88.3 | 85.8 |
| Avg. Jan. Low | 26 | 32.6 | 21.7 |
| Comfort Index (higher=better) | 7.3 | 7.6 | 7 |
| UV Index | 4.1 | 5.1 | 4.3 |
| Elevation ft. | 171 | 1050 | 2443 |