Tonalea, Arizona has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 4.7 °C (low) to 20.5 °C (high). Annual precipitation averages 185.2 Millimeters. Tonalea is located in USDA Plant Hardiness Zone 7b. 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 | -5.6 °C | 7.4 °C | 12.7 mm |
| February | -3.5 °C | 10.6 °C | 14.22 mm |
| March | -0.3 °C | 15.7 °C | 16 mm |
| April | 3.1 °C | 19.7 °C | 9.91 mm |
| May | 7.9 °C | 25 °C | 10.41 mm |
| June | 12.8 °C | 31.6 °C | 3.3 mm |
| July | 16.6 °C | 33.7 °C | 22.1 mm |
| August | 16.1 °C | 32.1 °C | 21.84 mm |
| September | 11.5 °C | 28.3 °C | 27.94 mm |
| October | 5 °C | 21.4 °C | 19.56 mm |
| November | -1.3 °C | 13.5 °C | 13.46 mm |
| December | -5.9 °C | 7.4 °C | 13.72 mm |
| Annual | 4.7 °C | 20.5 °C | 185.16 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BWk - Cold Desert Climate |