Stonewall, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.3 °C (low) to 25.5 °C (high). Annual precipitation averages 817.4 Millimeters. Stonewall is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.3 °C | 15.9 °C | 49.28 mm |
| February | 4.2 °C | 17.8 °C | 48.26 mm |
| March | 8.2 °C | 21.6 °C | 65.79 mm |
| April | 11.8 °C | 25.5 °C | 60.2 mm |
| May | 16.9 °C | 28.9 °C | 110.49 mm |
| June | 20.5 °C | 32.6 °C | 77.98 mm |
| July | 21.6 °C | 34.1 °C | 54.86 mm |
| August | 21.4 °C | 34.8 °C | 58.93 mm |
| September | 18.1 °C | 31.3 °C | 89.41 mm |
| October | 12.8 °C | 26.5 °C | 83.31 mm |
| November | 7.1 °C | 20.4 °C | 66.55 mm |
| December | 2.9 °C | 16.5 °C | 52.32 mm |
| Annual | 12.3 °C | 25.5 °C | 817.38 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |