Whetstone, Arizona has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 8.6 °C (low) to 25.5 °C (high). Annual precipitation averages 354.8 Millimeters. 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 | -0.1 °C | 16.5 °C | 21.08 mm |
| February | 1.3 °C | 18.1 °C | 18.54 mm |
| March | 3.8 °C | 21.3 °C | 16.76 mm |
| April | 6.6 °C | 25.2 °C | 6.86 mm |
| May | 10.7 °C | 29.7 °C | 6.6 mm |
| June | 16.3 °C | 34.6 °C | 6.86 mm |
| July | 18.7 °C | 33.6 °C | 84.33 mm |
| August | 18.1 °C | 32.2 °C | 88.39 mm |
| September | 15.1 °C | 30.9 °C | 45.97 mm |
| October | 9.1 °C | 26.9 °C | 22.35 mm |
| November | 3.5 °C | 21.3 °C | 16.26 mm |
| December | -0.2 °C | 16.2 °C | 20.83 mm |
| Annual | 8.6 °C | 25.5 °C | 354.83 mm |
| 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 : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |