| | Ferndale, WA | Sumas, WA | United States |
| Rainfall | 37.3 | 40.2 | 38.1 |
| Snowfall | 7.9 | 7.1 | 27.8 |
| Precipitation Days | 159.7 | 163.9 | 106.2 |
| Sunny | 159 | 155 | 205 |
| Avg. July High | 72.3 | 73.7 | 85.8 |
| Avg. Jan. Low | 34.4 | 33.8 | 21.7 |
| Comfort Index (higher=better) | 7.2 | 7.1 | 7 |
| UV Index | 2.5 | 2.5 | 4.3 |
| Elevation ft. | 36 | 43 | 2443 |