| | Castle Rock, WA | Duvall, WA | United States |
| Rainfall | 60.8 | 58.4 | 38.1 |
| Snowfall | 3.1 | 4.7 | 27.8 |
| Precipitation Days | 181.2 | 183.6 | 106.2 |
| Sunny | 139 | 154 | 205 |
| Avg. July High | 77.1 | 75.8 | 85.8 |
| Avg. Jan. Low | 33.8 | 34.8 | 21.7 |
| Comfort Index (higher=better) | 7.1 | 7.1 | 7 |
| UV Index | 3 | 2.6 | 4.3 |
| Elevation ft. | 56 | 89 | 2443 |