Grenville, New Mexico has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 2.5 °C (low) to 19.1 °C (high). Annual precipitation averages 416.3 Millimeters. Grenville 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.6 °C | 8.6 °C | 8.64 mm |
| February | -6.6 °C | 9.9 °C | 9.65 mm |
| March | -2.9 °C | 14.3 °C | 20.32 mm |
| April | 0.7 °C | 18.1 °C | 28.19 mm |
| May | 6 °C | 23.2 °C | 42.93 mm |
| June | 11.3 °C | 28.6 °C | 51.56 mm |
| July | 14.1 °C | 30.5 °C | 76.45 mm |
| August | 13.4 °C | 29.1 °C | 84.58 mm |
| September | 9.4 °C | 25.7 °C | 44.45 mm |
| October | 2.8 °C | 19.9 °C | 22.61 mm |
| November | -3.3 °C | 13.4 °C | 13.72 mm |
| December | -7.4 °C | 8.2 °C | 13.21 mm |
| Annual | 2.5 °C | 19.1 °C | 416.31 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 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |