Grenville, New Mexico has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 36.5 °F (low) to 66.4 °F (high). Annual precipitation averages 16.4 Inches. 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 | 18.4 °F | 47.4 °F | 0.34 in. |
| February | 20.1 °F | 49.9 °F | 0.38 in. |
| March | 26.7 °F | 57.8 °F | 0.8 in. |
| April | 33.3 °F | 64.6 °F | 1.11 in. |
| May | 42.8 °F | 73.8 °F | 1.69 in. |
| June | 52.4 °F | 83.5 °F | 2.03 in. |
| July | 57.3 °F | 86.9 °F | 3.01 in. |
| August | 56.1 °F | 84.3 °F | 3.33 in. |
| September | 48.9 °F | 78.3 °F | 1.75 in. |
| October | 37.0 °F | 67.9 °F | 0.89 in. |
| November | 26.1 °F | 56.1 °F | 0.54 in. |
| December | 18.7 °F | 46.8 °F | 0.52 in. |
| Annual | 36.5 °F | 66.4 °F | 16.39 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |