| 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 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Sep.1 - Sep. 10 |
| Average Last Frost Date: | Jun. 11 - Jun. 20 |
| Koppen-Geiger Climate Zone: | Dsb - Humid Continental Climate - Dry Cool Summer |
| Ecoregion: | 10b - Loess Islands |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 99122 - Davenport, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 23 | 28 | 33 | 40 | 45 | 50 | 50 | 42 | 33 | 27 | 19 | 34 |
| Avg Max Temp (°F) | 31 | 38 | 48 | 57 | 66 | 73 | 82 | 83 | 73 | 59 | 41 | 32 | 57 |
| Avg Precip (In.) | 1.48 | 1.29 | 1.35 | 1.05 | 1.43 | 1.07 | .8 | .54 | .67 | .93 | 1.98 | 1.98 | 14.59 |