Benton City, Washington has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 41.8 °F (low) to 65.4 °F (high). Annual precipitation averages 8.6 Inches. Benton City is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 28.1 °F | 40.7 °F | 1.1 in. |
| February | 29.2 °F | 47.5 °F | 0.87 in. |
| March | 34.3 °F | 57.3 °F | 0.8 in. |
| April | 39.5 °F | 65.4 °F | 0.67 in. |
| May | 47.3 °F | 74.8 °F | 0.82 in. |
| June | 53.4 °F | 81.8 °F | 0.69 in. |
| July | 59.0 °F | 90.9 °F | 0.15 in. |
| August | 58.5 °F | 90.0 °F | 0.15 in. |
| September | 50.5 °F | 80.2 °F | 0.26 in. |
| October | 40.9 °F | 65.3 °F | 0.78 in. |
| November | 32.8 °F | 50.3 °F | 1.07 in. |
| December | 27.8 °F | 40.4 °F | 1.24 in. |
| Annual | 41.8 °F | 65.4 °F | 8.6 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BWk - Cold Desert Climate |