| | Mercer Island, WA | Steilacoom, WA | United States |
| Rainfall | 39.2 | 44.2 | 38.1 |
| Snowfall | 5.1 | 5.5 | 27.8 |
| Precipitation Days | 152.7 | 151.3 | 106.2 |
| Sunny | 156 | 140 | 205 |
| Avg. July High | 76 | 77.1 | 85.8 |
| Avg. Jan. Low | 37 | 36.4 | 21.7 |
| Comfort Index (higher=better) | 7.5 | 7.4 | 7 |
| UV Index | 2.6 | 2.6 | 4.3 |
| Elevation ft. | 335 | 75 | 2443 |