San Jon, New Mexico has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 43.7 °F (low) to 73.7 °F (high). Annual precipitation averages 17.2 Inches. 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 | 23.9 °F | 52.7 °F | 0.57 in. |
| February | 26.8 °F | 57.5 °F | 0.41 in. |
| March | 33.8 °F | 65.6 °F | 0.97 in. |
| April | 41.3 °F | 73.4 °F | 1.05 in. |
| May | 51.2 °F | 82.1 °F | 1.82 in. |
| June | 61.0 °F | 92.0 °F | 2.2 in. |
| July | 65.2 °F | 94.2 °F | 2.63 in. |
| August | 63.7 °F | 91.6 °F | 2.9 in. |
| September | 56.7 °F | 85.4 °F | 1.5 in. |
| October | 43.8 °F | 74.9 °F | 1.62 in. |
| November | 32.3 °F | 62.3 °F | 0.69 in. |
| December | 24.9 °F | 52.6 °F | 0.83 in. |
| Annual | 43.7 °F | 73.7 °F | 17.19 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |