| 2023 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 |
| 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: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dsb - Humid Continental Climate - Dry Cool Summer |
| Ecoregion: | 10m - Okanogan Valley |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 98840 - Okanogan, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 22 | 29 | 36 | 43 | 50 | 55 | 55 | 46 | 35 | 27 | 19 | 36 |
| Avg Max Temp (°F) | 30 | 39 | 50 | 61 | 70 | 78 | 85 | 84 | 75 | 60 | 42 | 32 | 59 |
| Avg Precip (In.) | 1.17 | 1.24 | .94 | .89 | .99 | 1.19 | .68 | .53 | .55 | .77 | 1.42 | 1.71 | 12.09 |