| 2023 Hardiness Zone: | Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| 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 98902 - Yakima, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 25 | 30 | 34 | 41 | 47 | 52 | 51 | 43 | 34 | 27 | 21 | 36 |
| Avg Max Temp (°F) | 38 | 46 | 56 | 64 | 72 | 79 | 87 | 86 | 77 | 64 | 48 | 37 | 63 |
| Avg Precip (In.) | 1.2 | .79 | .69 | .53 | .5 | .61 | .23 | .35 | .38 | .52 | 1.04 | 1.41 | 8.25 |