| | Middletown, DE | Sterling, VA | United States |
| Rainfall | 45.1 | 42 | 38.1 |
| Snowfall | 14.5 | 21.5 | 27.8 |
| Precipitation Days | 112.9 | 116.2 | 106.2 |
| Sunny | 204 | 197 | 205 |
| Avg. July High | 86.9 | 85.8 | 85.8 |
| Avg. Jan. Low | 23.9 | 23.5 | 21.7 |
| Comfort Index (higher=better) | 7.3 | 7.3 | 7 |
| UV Index | 4.1 | 4 | 4.3 |
| Elevation ft. | 66 | 292 | 2443 |