Hillsboro, New Mexico has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 5.6 °C (low) to 23.2 °C (high). Annual precipitation averages 272.3 Millimeters. Hillsboro is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4 °C | 12.4 °C | 15.49 mm |
| February | -2.2 °C | 15.1 °C | 11.43 mm |
| March | 0.8 °C | 19 °C | 9.91 mm |
| April | 4.2 °C | 23.3 °C | 8.89 mm |
| May | 8.6 °C | 28 °C | 7.62 mm |
| June | 13.6 °C | 33.3 °C | 18.03 mm |
| July | 16.6 °C | 33.1 °C | 51.82 mm |
| August | 15.7 °C | 31.6 °C | 39.62 mm |
| September | 11.9 °C | 28.8 °C | 45.21 mm |
| October | 5.7 °C | 24.1 °C | 25.91 mm |
| November | -0.2 °C | 17.3 °C | 17.02 mm |
| December | -3.8 °C | 12.2 °C | 21.34 mm |
| Annual | 5.6 °C | 23.2 °C | 272.29 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |