| | Sumas, WA | Forks, WA | United States |
| Rainfall | 40.2 | 110 | 38.1 |
| Snowfall | 7.1 | 6.5 | 27.8 |
| Precipitation Days | 163.9 | 205.6 | 106.2 |
| Sunny | 155 | 131 | 205 |
| Avg. July High | 73.7 | 70.6 | 85.8 |
| Avg. Jan. Low | 33.8 | 35.5 | 21.7 |
| Comfort Index (higher=better) | 7.1 | 6.5 | 7 |
| UV Index | 2.5 | 2.7 | 4.3 |
| Elevation ft. | 43 | 305 | 2443 |