Mesilla, New Mexico has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 9.2 °C (low) to 26.2 °C (high). Annual precipitation averages 244.9 Millimeters. Mesilla is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.2 °C | 15.1 °C | 11.94 mm |
| February | 0.9 °C | 18 °C | 11.94 mm |
| March | 4.3 °C | 22.2 °C | 6.1 mm |
| April | 8 °C | 26.4 °C | 6.6 mm |
| May | 12.7 °C | 31.4 °C | 10.16 mm |
| June | 18.2 °C | 36.3 °C | 15.49 mm |
| July | 20.7 °C | 36 °C | 44.2 mm |
| August | 19.8 °C | 34.7 °C | 50.55 mm |
| September | 16.1 °C | 31.8 °C | 35.05 mm |
| October | 9.4 °C | 27 °C | 23.37 mm |
| November | 2.8 °C | 20.2 °C | 11.94 mm |
| December | -1.2 °C | 14.8 °C | 17.53 mm |
| Annual | 9.2 °C | 26.2 °C | 244.87 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BWk - Cold Desert Climate |