| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7b: 5°F to 10°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 7b: 5°F to 10°F Zone 7a: 0°F to 5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dsb - Humid Continental Climate - Dry Cool Summer |
| Ecoregion: | 10a - Channeled Scablands |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 98816 - Chelan, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 25 | 32 | 39 | 47 | 54 | 59 | 59 | 50 | 39 | 30 | 22 | 40 |
| Avg Max Temp (°F) | 33 | 39 | 51 | 61 | 70 | 77 | 84 | 85 | 75 | 61 | 43 | 33 | 59 |
| Avg Precip (In.) | 1.43 | 1.16 | .94 | .63 | .74 | .79 | .38 | .42 | .44 | .62 | 1.52 | 1.67 | 10.73 |