| | Union, WA | Sumner, WA | United States |
| Rainfall | 70.1 | 48.9 | 38.1 |
| Snowfall | 3.6 | 4.7 | 27.8 |
| Precipitation Days | 160.8 | 172.4 | 106.2 |
| Sunny | 136 | 141 | 205 |
| Avg. July High | 75.6 | 75.7 | 85.8 |
| Avg. Jan. Low | 34.5 | 34.7 | 21.7 |
| Comfort Index (higher=better) | 7.1 | 7.1 | 7 |
| UV Index | 2.6 | 2.6 | 4.3 |
| Elevation ft. | 148 | 75 | 2443 |