Whetstone, Arizona has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 47.4 °F (low) to 78 °F (high). Annual precipitation averages 14 Inches. Whetstone is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 31.8 °F | 61.7 °F | 0.83 in. |
| February | 34.3 °F | 64.5 °F | 0.73 in. |
| March | 38.9 °F | 70.3 °F | 0.66 in. |
| April | 43.8 °F | 77.4 °F | 0.27 in. |
| May | 51.2 °F | 85.4 °F | 0.26 in. |
| June | 61.4 °F | 94.2 °F | 0.27 in. |
| July | 65.7 °F | 92.4 °F | 3.32 in. |
| August | 64.5 °F | 89.9 °F | 3.48 in. |
| September | 59.2 °F | 87.7 °F | 1.81 in. |
| October | 48.3 °F | 80.5 °F | 0.88 in. |
| November | 38.3 °F | 70.4 °F | 0.64 in. |
| December | 31.7 °F | 61.1 °F | 0.82 in. |
| Annual | 47.4 °F | 78 °F | 13.97 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |