San Antonio, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 58.7 °F (low) to 81.2 °F (high). Annual precipitation averages 32.6 Inches. San Antonio is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 40.7 °F | 64.2 °F | 1.99 in. |
| February | 44.7 °F | 68.5 °F | 1.93 in. |
| March | 51.5 °F | 74.6 °F | 2.46 in. |
| April | 58.1 °F | 81.1 °F | 2.28 in. |
| May | 66.7 °F | 87.4 °F | 3.9 in. |
| June | 72.5 °F | 93.0 °F | 3.24 in. |
| July | 74.2 °F | 95.6 °F | 2.17 in. |
| August | 74.2 °F | 96.8 °F | 2.41 in. |
| September | 69.4 °F | 91.3 °F | 3.72 in. |
| October | 60.1 °F | 83.2 °F | 3.73 in. |
| November | 49.8 °F | 72.8 °F | 2.54 in. |
| December | 42.4 °F | 65.6 °F | 2.18 in. |
| Annual | 58.7 °F | 81.2 °F | 32.55 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |