Mountainair, New Mexico has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.8 °C (low) to 19.9 °C (high). Annual precipitation averages 364 Millimeters. Mountainair is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.3 °C | 8.3 °C | 17.27 mm |
| February | -4.7 °C | 10.9 °C | 16 mm |
| March | -1.9 °C | 15.3 °C | 22.86 mm |
| April | 1 °C | 19.6 °C | 15.49 mm |
| May | 5.5 °C | 24.6 °C | 21.08 mm |
| June | 10.7 °C | 30.6 °C | 22.86 mm |
| July | 13.2 °C | 30.9 °C | 63.75 mm |
| August | 12.6 °C | 29.6 °C | 62.74 mm |
| September | 9 °C | 26.3 °C | 49.02 mm |
| October | 3.2 °C | 20.5 °C | 36.83 mm |
| November | -2.4 °C | 13.6 °C | 17.78 mm |
| December | -6.1 °C | 8.2 °C | 18.29 mm |
| Annual | 2.8 °C | 19.9 °C | 363.97 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |