San Luis, New Mexico has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.2 °C (low) to 19.8 °C (high). Annual precipitation averages 273.3 Millimeters. San Luis is located in USDA Plant Hardiness Zone 6b. 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 | -7.8 °C | 7.3 °C | 14.99 mm |
| February | -5.6 °C | 10.1 °C | 12.19 mm |
| March | -2.6 °C | 14.8 °C | 16.51 mm |
| April | 0.6 °C | 19.3 °C | 19.56 mm |
| May | 5.3 °C | 24.6 °C | 17.27 mm |
| June | 10.2 °C | 30.7 °C | 15.49 mm |
| July | 13.9 °C | 32.1 °C | 43.43 mm |
| August | 13.1 °C | 30.6 °C | 41.91 mm |
| September | 8.9 °C | 26.9 °C | 33.27 mm |
| October | 2.2 °C | 20.6 °C | 25.4 mm |
| November | -3.6 °C | 13.2 °C | 16.76 mm |
| December | -7.7 °C | 7.4 °C | 16.51 mm |
| Annual | 2.2 °C | 19.8 °C | 273.29 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 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |