Grants, New Mexico has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.5 °C (low) to 20 °C (high). Annual precipitation averages 261.6 Millimeters. Grants is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.5 °C | 8.2 °C | 10.16 mm |
| February | -6.4 °C | 10.8 °C | 12.7 mm |
| March | -3.7 °C | 14.9 °C | 13.72 mm |
| April | -0.2 °C | 19.6 °C | 17.02 mm |
| May | 4.6 °C | 24.4 °C | 10.16 mm |
| June | 9.4 °C | 30.6 °C | 18.29 mm |
| July | 13.4 °C | 31.5 °C | 48.01 mm |
| August | 12.4 °C | 30.1 °C | 48.26 mm |
| September | 8.1 °C | 26.9 °C | 33.27 mm |
| October | 1.3 °C | 21.2 °C | 22.86 mm |
| November | -4.4 °C | 13.7 °C | 11.68 mm |
| December | -8.4 °C | 8.4 °C | 15.49 mm |
| Annual | 1.5 °C | 20 °C | 261.62 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |