Mountainaire, Arizona has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 33.3 °F (low) to 63.5 °F (high). Annual precipitation averages 21.7 Inches. Mountainaire is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.7 °F | 45.0 °F | 2.43 in. |
| February | 20.8 °F | 47.3 °F | 2.58 in. |
| March | 25.0 °F | 53.7 °F | 2.18 in. |
| April | 29.3 °F | 60.3 °F | 1.24 in. |
| May | 36.2 °F | 69.4 °F | 0.77 in. |
| June | 44.4 °F | 80.5 °F | 0.34 in. |
| July | 52.2 °F | 83.6 °F | 2.08 in. |
| August | 51.3 °F | 81.0 °F | 2.82 in. |
| September | 44.1 °F | 75.8 °F | 2.13 in. |
| October | 33.4 °F | 65.6 °F | 1.48 in. |
| November | 25.0 °F | 54.2 °F | 1.48 in. |
| December | 18.6 °F | 45.0 °F | 2.13 in. |
| Annual | 33.3 °F | 63.5 °F | 21.66 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |