Folsom, New Mexico has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.8 °C (low) to 18.4 °C (high). Annual precipitation averages 414.3 Millimeters. Folsom is located in USDA Plant Hardiness Zone 6a. 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 | -8.2 °C | 7.9 °C | 11.94 mm |
| February | -7.1 °C | 9.3 °C | 9.65 mm |
| March | -3.6 °C | 13.5 °C | 23.37 mm |
| April | 0.2 °C | 17.1 °C | 29.46 mm |
| May | 5.3 °C | 22.2 °C | 45.72 mm |
| June | 10.6 °C | 27.8 °C | 43.18 mm |
| July | 13.4 °C | 29.6 °C | 76.2 mm |
| August | 12.7 °C | 28.5 °C | 78.49 mm |
| September | 8.6 °C | 25.1 °C | 42.16 mm |
| October | 2 °C | 19.3 °C | 27.94 mm |
| November | -4 °C | 12.9 °C | 13.46 mm |
| December | -8.1 °C | 7.7 °C | 12.7 mm |
| Annual | 1.8 °C | 18.4 °C | 414.27 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |