| | Halfmoon, NY | McLean, VA | United States |
| Rainfall | 40.8 | 43.8 | 38.1 |
| Snowfall | 57.8 | 20.1 | 27.8 |
| Precipitation Days | 135.6 | 117 | 106.2 |
| Sunny | 180 | 203 | 205 |
| Avg. July High | 83.2 | 86 | 85.8 |
| Avg. Jan. Low | 13.8 | 24.5 | 21.7 |
| Comfort Index (higher=better) | 6.7 | 7.3 | 7 |
| UV Index | 3.5 | 4 | 4.3 |
| Elevation ft. | 279 | 285 | 2443 |