| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate |
| Ecoregion: | 10m - Okanogan Valley |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 98841 - Omak, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 22 | 29 | 36 | 44 | 50 | 56 | 55 | 46 | 35 | 28 | 19 | 36 |
| Avg Max Temp (°F) | 30 | 39 | 51 | 62 | 71 | 78 | 85 | 85 | 76 | 60 | 41 | 31 | 59 |
| Avg Precip (In.) | 1.16 | 1.22 | .99 | 1.06 | 1.01 | 1.2 | .73 | .59 | .54 | .77 | 1.41 | 1.76 | 12.45 |