Tonalea, Arizona has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 40.5 °F (low) to 69 °F (high). Annual precipitation averages 7.3 Inches. 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 | 22.0 °F | 45.3 °F | 0.5 in. |
| February | 25.7 °F | 51.0 °F | 0.56 in. |
| March | 31.4 °F | 60.2 °F | 0.63 in. |
| April | 37.6 °F | 67.4 °F | 0.39 in. |
| May | 46.3 °F | 77.0 °F | 0.41 in. |
| June | 55.0 °F | 88.9 °F | 0.13 in. |
| July | 61.8 °F | 92.7 °F | 0.87 in. |
| August | 60.9 °F | 89.8 °F | 0.86 in. |
| September | 52.7 °F | 82.9 °F | 1.1 in. |
| October | 41.0 °F | 70.5 °F | 0.77 in. |
| November | 29.6 °F | 56.3 °F | 0.53 in. |
| December | 21.4 °F | 45.4 °F | 0.54 in. |
| Annual | 40.5 °F | 69 °F | 7.29 in. |
| 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 : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BWk - Cold Desert Climate |