Belen, New Mexico has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 4.5 °C (low) to 23.3 °C (high). Annual precipitation averages 237 Millimeters. Belen is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.5 °C | 11.1 °C | 14.73 mm |
| February | -4.2 °C | 14.6 °C | 9.65 mm |
| March | -0.4 °C | 19.1 °C | 14.48 mm |
| April | 3.6 °C | 23.4 °C | 15.49 mm |
| May | 8.4 °C | 28.4 °C | 14.73 mm |
| June | 13.6 °C | 33.9 °C | 12.19 mm |
| July | 17 °C | 34.7 °C | 42.67 mm |
| August | 16.1 °C | 33.3 °C | 33.02 mm |
| September | 11.3 °C | 29.9 °C | 28.45 mm |
| October | 4.2 °C | 23.9 °C | 24.89 mm |
| November | -2.3 °C | 16.6 °C | 11.94 mm |
| December | -6.3 °C | 10.7 °C | 14.73 mm |
| Annual | 4.5 °C | 23.3 °C | 236.97 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |