Tonto Basin, Arizona has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 12.4 °C (low) to 28.2 °C (high). Annual precipitation averages 402.1 Millimeters. Tonto Basin is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.9 °C | 17 °C | 58.42 mm |
| February | 4.2 °C | 19.1 °C | 51.82 mm |
| March | 6.8 °C | 22.8 °C | 46.99 mm |
| April | 10.1 °C | 27.2 °C | 11.68 mm |
| May | 14.8 °C | 32.3 °C | 9.65 mm |
| June | 20.1 °C | 38.1 °C | 1.27 mm |
| July | 23.7 °C | 39.6 °C | 33.53 mm |
| August | 23.3 °C | 38.7 °C | 50.04 mm |
| September | 19.7 °C | 35.6 °C | 38.35 mm |
| October | 13 °C | 29.6 °C | 23.88 mm |
| November | 6.9 °C | 22.2 °C | 28.19 mm |
| December | 2.9 °C | 16.6 °C | 48.26 mm |
| Annual | 12.4 °C | 28.2 °C | 402.08 mm |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |