Austwell, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 17.4 °C (low) to 25.7 °C (high). Annual precipitation averages 1013.7 Millimeters. Austwell is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.8 °C | 17.6 °C | 69.6 mm |
| February | 10.1 °C | 19.4 °C | 49.78 mm |
| March | 13.7 °C | 22.1 °C | 75.95 mm |
| April | 17.2 °C | 25.1 °C | 56.13 mm |
| May | 21.4 °C | 28.4 °C | 101.35 mm |
| June | 24.4 °C | 31.3 °C | 96.27 mm |
| July | 25.3 °C | 32.1 °C | 90.42 mm |
| August | 25.1 °C | 32.8 °C | 93.73 mm |
| September | 22.9 °C | 31.2 °C | 150.62 mm |
| October | 18.8 °C | 27.4 °C | 94.74 mm |
| November | 13.2 °C | 22.6 °C | 72.14 mm |
| December | 9.1 °C | 18.7 °C | 62.99 mm |
| Annual | 17.4 °C | 25.7 °C | 1013.72 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |