Roy, New Mexico has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 3 °C (low) to 19.4 °C (high). Annual precipitation averages 386.1 Millimeters. Roy is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.9 °C | 8.5 °C | 10.92 mm |
| February | -5.8 °C | 10.4 °C | 9.65 mm |
| March | -2.4 °C | 14.8 °C | 18.29 mm |
| April | 1.3 °C | 18.7 °C | 18.03 mm |
| May | 6.4 °C | 23.8 °C | 38.61 mm |
| June | 11.4 °C | 29.2 °C | 45.21 mm |
| July | 14.2 °C | 30.4 °C | 68.07 mm |
| August | 13.7 °C | 29.3 °C | 75.95 mm |
| September | 9.8 °C | 25.8 °C | 50.8 mm |
| October | 3.2 °C | 20.2 °C | 23.88 mm |
| November | -2.6 °C | 13.8 °C | 11.68 mm |
| December | -6.4 °C | 8.2 °C | 14.99 mm |
| Annual | 3 °C | 19.4 °C | 386.08 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°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 |