San Antonio, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.8 °C (low) to 27.3 °C (high). Annual precipitation averages 826.8 Millimeters. 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 | 4.8 °C | 17.9 °C | 50.55 mm |
| February | 7.1 °C | 20.3 °C | 49.02 mm |
| March | 10.8 °C | 23.7 °C | 62.48 mm |
| April | 14.5 °C | 27.3 °C | 57.91 mm |
| May | 19.3 °C | 30.8 °C | 99.06 mm |
| June | 22.5 °C | 33.9 °C | 82.3 mm |
| July | 23.4 °C | 35.3 °C | 55.12 mm |
| August | 23.4 °C | 36 °C | 61.21 mm |
| September | 20.8 °C | 32.9 °C | 94.49 mm |
| October | 15.6 °C | 28.4 °C | 94.74 mm |
| November | 9.9 °C | 22.7 °C | 64.52 mm |
| December | 5.8 °C | 18.7 °C | 55.37 mm |
| Annual | 14.8 °C | 27.3 °C | 826.77 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |