| | Rock Island, WA | Brewster, WA | United States |
| Rainfall | 13.9 | 12.9 | 38.1 |
| Snowfall | 60 | 32.6 | 27.8 |
| Precipitation Days | 78.3 | 67.2 | 106.2 |
| Sunny | 200 | 188 | 205 |
| Avg. July High | 85.2 | 88.9 | 85.8 |
| Avg. Jan. Low | 24 | 21.1 | 21.7 |
| Comfort Index (higher=better) | 7.1 | 7.1 | 7 |
| UV Index | 2.7 | 3.1 | 4.3 |
| Elevation ft. | 640 | 804 | 2443 |