| | Arlington, VA | Milton, DE | United States |
| Rainfall | 43.3 | 45.8 | 38.1 |
| Snowfall | 14.9 | 12 | 27.8 |
| Precipitation Days | 117 | 123 | 106.2 |
| Sunny | 201 | 205 | 205 |
| Avg. July High | 87.7 | 86.6 | 85.8 |
| Avg. Jan. Low | 26.5 | 27.1 | 21.7 |
| Comfort Index (higher=better) | 7.3 | 7.4 | 7 |
| UV Index | 4 | 3.9 | 4.3 |
| Elevation ft. | 236 | 10 | 2443 |