Willcox, Arizona has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 45.5 °F (low) to 78.7 °F (high). Annual precipitation averages 12.3 Inches. Willcox is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 29.2 °F | 60.5 °F | 1.03 in. |
| February | 31.8 °F | 64.2 °F | 0.85 in. |
| March | 36.7 °F | 70.6 °F | 0.73 in. |
| April | 41.8 °F | 78.0 °F | 0.24 in. |
| May | 48.5 °F | 86.2 °F | 0.3 in. |
| June | 59.1 °F | 95.9 °F | 0.35 in. |
| July | 65.5 °F | 95.5 °F | 2.57 in. |
| August | 64.4 °F | 93.1 °F | 2.5 in. |
| September | 58.1 °F | 89.6 °F | 1.27 in. |
| October | 45.9 °F | 81.2 °F | 0.67 in. |
| November | 35.4 °F | 69.5 °F | 0.65 in. |
| December | 29.1 °F | 59.6 °F | 1.09 in. |
| Annual | 45.5 °F | 78.7 °F | 12.25 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |