| | Mattawa, WA | Morton, WA | United States |
| Rainfall | 7.5 | 60.9 | 38.1 |
| Snowfall | 9.1 | 13 | 27.8 |
| Precipitation Days | 59.1 | 153.1 | 106.2 |
| Sunny | 188 | 137 | 205 |
| Avg. July High | 91.1 | 77.9 | 85.8 |
| Avg. Jan. Low | 27.1 | 32.4 | 21.7 |
| Comfort Index (higher=better) | 7.6 | 7 | 7 |
| UV Index | 3.2 | 2.5 | 4.3 |
| Elevation ft. | 768 | 958 | 2443 |