Prewitt, New Mexico has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.4 °C (low) to 18.9 °C (high). Annual precipitation averages 265.9 Millimeters. Prewitt is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.3 °C | 7.2 °C | 13.46 mm |
| February | -6.2 °C | 9.6 °C | 12.95 mm |
| March | -3.9 °C | 13.7 °C | 12.95 mm |
| April | -0.3 °C | 18.1 °C | 13.72 mm |
| May | 4.3 °C | 23 °C | 14.22 mm |
| June | 9.2 °C | 29.4 °C | 12.7 mm |
| July | 13 °C | 30.4 °C | 44.45 mm |
| August | 12.1 °C | 29 °C | 55.63 mm |
| September | 7.9 °C | 25.8 °C | 32.26 mm |
| October | 1.3 °C | 20 °C | 22.35 mm |
| November | -4.3 °C | 12.7 °C | 13.72 mm |
| December | -8.2 °C | 7.5 °C | 17.53 mm |
| Annual | 1.4 °C | 18.9 °C | 265.94 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°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 |