San Mateo, New Mexico has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.1 °C (low) to 17.6 °C (high). Annual precipitation averages 266.5 Millimeters. San Mateo 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 | -8.2 °C | 6.1 °C | 8.13 mm |
| February | -6.5 °C | 8.3 °C | 8.64 mm |
| March | -4 °C | 12.5 °C | 10.41 mm |
| April | -0.8 °C | 16.8 °C | 9.65 mm |
| May | 3.8 °C | 21.7 °C | 15.49 mm |
| June | 8.8 °C | 28.1 °C | 15.24 mm |
| July | 12.2 °C | 28.9 °C | 54.36 mm |
| August | 11.6 °C | 27.7 °C | 62.74 mm |
| September | 7.6 °C | 24.7 °C | 36.83 mm |
| October | 1.3 °C | 18.6 °C | 15.75 mm |
| November | -3.7 °C | 11.6 °C | 16 mm |
| December | -8.7 °C | 6.5 °C | 13.21 mm |
| Annual | 1.1 °C | 17.6 °C | 266.45 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| 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 | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |