San Jon, New Mexico has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 6.5 °C (low) to 23.2 °C (high). Annual precipitation averages 436.6 Millimeters. San Jon is located in USDA Plant Hardiness Zone 7a. 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 | -4.5 °C | 11.5 °C | 14.48 mm |
| February | -2.9 °C | 14.2 °C | 10.41 mm |
| March | 1 °C | 18.7 °C | 24.64 mm |
| April | 5.2 °C | 23 °C | 26.67 mm |
| May | 10.7 °C | 27.8 °C | 46.23 mm |
| June | 16.1 °C | 33.3 °C | 55.88 mm |
| July | 18.4 °C | 34.6 °C | 66.8 mm |
| August | 17.6 °C | 33.1 °C | 73.66 mm |
| September | 13.7 °C | 29.7 °C | 38.1 mm |
| October | 6.6 °C | 23.8 °C | 41.15 mm |
| November | 0.2 °C | 16.8 °C | 17.53 mm |
| December | -3.9 °C | 11.4 °C | 21.08 mm |
| Annual | 6.5 °C | 23.2 °C | 436.63 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 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 | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |