| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°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: | 10e - Pleistocene Lake Basins |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 98901 - Yakima, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 22 | 25 | 30 | 34 | 41 | 47 | 52 | 51 | 44 | 35 | 28 | 22 | 36 |
| Avg Max Temp (°F) | 37 | 45 | 55 | 63 | 71 | 79 | 86 | 86 | 77 | 64 | 47 | 37 | 62 |
| Avg Precip (In.) | 1.28 | .93 | .78 | .62 | .58 | .62 | .26 | .41 | .43 | .63 | 1.21 | 1.47 | 9.22 |