Mabton, Washington has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 38.6 °F (low) to 64.5 °F (high). Annual precipitation averages 8 Inches. Mabton is located in USDA Plant Hardiness Zone 7a. 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 | 26.3 °F | 39.9 °F | 1.09 in. |
| February | 27.2 °F | 47.4 °F | 0.78 in. |
| March | 31.4 °F | 56.9 °F | 0.61 in. |
| April | 36.2 °F | 64.3 °F | 0.63 in. |
| May | 44.3 °F | 73.9 °F | 0.7 in. |
| June | 50.1 °F | 80.4 °F | 0.64 in. |
| July | 54.8 °F | 89.4 °F | 0.28 in. |
| August | 53.5 °F | 88.3 °F | 0.2 in. |
| September | 46.1 °F | 79.2 °F | 0.27 in. |
| October | 37.3 °F | 64.9 °F | 0.79 in. |
| November | 29.9 °F | 49.8 °F | 0.9 in. |
| December | 25.7 °F | 39.3 °F | 1.11 in. |
| Annual | 38.6 °F | 64.5 °F | 8 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BWk - Cold Desert Climate |