| Mercer Island, WA | Castle Rock, WA | United States |
Rainfall | 39 | 61 | 38 |
Snowfall | 5 | 3 | 28 |
Precipitation | 153 | 181 | 106 |
Sunny | 156 | 139 | 205 |
Avg. July High | 76 | 77 | 86 |
Avg. Jan. Low | 37 | 34 | 22 |
Comfort Index (higher=better) | 7.5 | 7.1 | 7 |
UV Index | 2.6 | 3 | 4.3 |
Elevation | 335 | 56 | 2443 |