Austell, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.2 °C (low) to 22.1 °C (high). Annual precipitation averages 1381 Millimeters. Austell is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.2 °C | 11.4 °C | 123.44 mm |
| February | 1.3 °C | 13.6 °C | 124.97 mm |
| March | 5 °C | 18.1 °C | 129.54 mm |
| April | 9.3 °C | 22.6 °C | 106.93 mm |
| May | 14.4 °C | 26.2 °C | 106.43 mm |
| June | 18.8 °C | 29.6 °C | 109.22 mm |
| July | 20.8 °C | 31.2 °C | 138.18 mm |
| August | 20.3 °C | 30.7 °C | 108.71 mm |
| September | 16.9 °C | 28.1 °C | 105.41 mm |
| October | 10.4 °C | 22.8 °C | 93.73 mm |
| November | 4.3 °C | 17.4 °C | 110.24 mm |
| December | 1.5 °C | 12.9 °C | 124.21 mm |
| Annual | 10.2 °C | 22.1 °C | 1381.01 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |