Brantley, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.5 °C (low) to 25.3 °C (high). Annual precipitation averages 1496.6 Millimeters. Brantley is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.6 °C | 15.4 °C | 132.33 mm |
| February | 3.4 °C | 17.9 °C | 119.63 mm |
| March | 6.9 °C | 21.7 °C | 138.43 mm |
| April | 10.5 °C | 25.8 °C | 113.03 mm |
| May | 15.2 °C | 29.6 °C | 99.06 mm |
| June | 19.7 °C | 32.2 °C | 145.29 mm |
| July | 21.3 °C | 33.4 °C | 148.59 mm |
| August | 20.9 °C | 32.9 °C | 148.08 mm |
| September | 18.3 °C | 31.2 °C | 112.52 mm |
| October | 11.7 °C | 26.2 °C | 97.79 mm |
| November | 5.6 °C | 20.7 °C | 107.95 mm |
| December | 3.1 °C | 16.7 °C | 133.86 mm |
| Annual | 11.5 °C | 25.3 °C | 1496.56 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 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 |