Mountainaire, Arizona has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 0.7 °C (low) to 17.5 °C (high). Annual precipitation averages 550.2 Millimeters. 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 | -7.4 °C | 7.2 °C | 61.72 mm |
| February | -6.2 °C | 8.5 °C | 65.53 mm |
| March | -3.9 °C | 12.1 °C | 55.37 mm |
| April | -1.5 °C | 15.7 °C | 31.5 mm |
| May | 2.3 °C | 20.8 °C | 19.56 mm |
| June | 6.9 °C | 26.9 °C | 8.64 mm |
| July | 11.2 °C | 28.7 °C | 52.83 mm |
| August | 10.7 °C | 27.2 °C | 71.63 mm |
| September | 6.7 °C | 24.3 °C | 54.1 mm |
| October | 0.8 °C | 18.7 °C | 37.59 mm |
| November | -3.9 °C | 12.3 °C | 37.59 mm |
| December | -7.4 °C | 7.2 °C | 54.1 mm |
| Annual | 0.7 °C | 17.5 °C | 550.16 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |