| 2023 Hardiness Zone: | 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 |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 15r - Okanogan-Colville Xeric Valleys and Foothills |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 99131 - Gifford, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 22 | 25 | 32 | 39 | 46 | 48 | 48 | 40 | 33 | 28 | 21 | 33 |
| Avg Max Temp (°F) | 34 | 42 | 50 | 60 | 71 | 78 | 86 | 86 | 76 | 58 | 42 | 34 | 60 |
| Avg Precip (In.) | 1.91 | 1.38 | 1.27 | 1.13 | 1.46 | .93 | .54 | .56 | .7 | .98 | 2.15 | 2.62 | 15.61 |