| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate |
| Ecoregion: | 10g - Yakima Folds |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 98908 - Yakima, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 25 | 29 | 34 | 41 | 47 | 52 | 51 | 43 | 34 | 27 | 21 | 35 |
| Avg Max Temp (°F) | 37 | 44 | 54 | 62 | 70 | 77 | 85 | 85 | 76 | 63 | 47 | 37 | 61 |
| Avg Precip (In.) | 1.53 | 1.13 | .85 | .62 | .62 | .69 | .32 | .4 | .46 | .59 | 1.43 | 1.71 | 10.35 |