| | Copalis Beach, WA | Castle Rock, WA | United States |
| Rainfall | 90.2 | 60.8 | 38.1 |
| Snowfall | 2 | 3.1 | 27.8 |
| Precipitation Days | 185.8 | 181.2 | 106.2 |
| Sunny | 126 | 139 | 205 |
| Avg. July High | 68.3 | 77.1 | 85.8 |
| Avg. Jan. Low | 36.5 | 33.8 | 21.7 |
| Comfort Index (higher=better) | 6.8 | 7.1 | 7 |
| UV Index | 2.7 | 3 | 4.3 |
| Elevation ft. | 23 | 56 | 2443 |