Dennehotso, Arizona has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 39.6 °F (low) to 70.5 °F (high). Annual precipitation averages 6.1 Inches. Dennehotso is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.2 °F | 44.3 °F | 0.67 in. |
| February | 24.4 °F | 50.9 °F | 0.47 in. |
| March | 30.7 °F | 61.5 °F | 0.51 in. |
| April | 37.4 °F | 70.3 °F | 0.28 in. |
| May | 46.6 °F | 80.1 °F | 0.38 in. |
| June | 55.2 °F | 92.3 °F | 0.18 in. |
| July | 63.0 °F | 96.2 °F | 0.51 in. |
| August | 61.3 °F | 92.9 °F | 0.71 in. |
| September | 52.1 °F | 85.1 °F | 0.8 in. |
| October | 38.8 °F | 71.1 °F | 0.69 in. |
| November | 27.1 °F | 56.2 °F | 0.46 in. |
| December | 19.5 °F | 44.6 °F | 0.42 in. |
| Annual | 39.6 °F | 70.5 °F | 6.08 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BWk - Cold Desert Climate |