| 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 7a: 0F to 5F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | BWk - Cold Desert Climate |
| Ecoregion: | 10e - Pleistocene Lake Basins |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 99320 - Benton City, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 26 | 30 | 34 | 39 | 46 | 52 | 57 | 57 | 49 | 40 | 33 | 27 | 41 |
| Avg Max Temp (°F) | 39 | 47 | 56 | 64 | 73 | 81 | 88 | 88 | 78 | 64 | 48 | 40 | 64 |
| Avg Precip (In.) | 1.03 | .73 | .7 | .63 | .69 | .55 | .25 | .33 | .42 | .64 | 1.09 | 1.18 | 8.23 |