| | Sumas, WA | Vashon, WA | United States |
| Rainfall | 40.2 | 39.9 | 38.1 |
| Snowfall | 7.1 | 3.9 | 27.8 |
| Precipitation Days | 163.9 | 156.1 | 106.2 |
| Sunny | 155 | 140 | 205 |
| Avg. July High | 73.7 | 76.2 | 85.8 |
| Avg. Jan. Low | 33.8 | 36.9 | 21.7 |
| Comfort Index (higher=better) | 7.1 | 7.3 | 7 |
| UV Index | 2.5 | 2.6 | 4.3 |
| Elevation ft. | 43 | 381 | 2443 |