Brantleyville, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.1 °C (low) to 23.7 °C (high). Annual precipitation averages 1452.9 Millimeters. Brantleyville is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.1 °C | 12.9 °C | 135.38 mm |
| February | 2.7 °C | 15.4 °C | 145.29 mm |
| March | 6.3 °C | 19.7 °C | 141.22 mm |
| April | 10.2 °C | 24 °C | 132.59 mm |
| May | 15.2 °C | 27.9 °C | 107.95 mm |
| June | 19.4 °C | 31.2 °C | 121.16 mm |
| July | 21.2 °C | 32.9 °C | 118.87 mm |
| August | 20.8 °C | 32.7 °C | 112.78 mm |
| September | 17.8 °C | 30.2 °C | 103.38 mm |
| October | 11.3 °C | 24.6 °C | 83.06 mm |
| November | 5.3 °C | 18.6 °C | 115.57 mm |
| December | 2.3 °C | 14.1 °C | 135.64 mm |
| Annual | 11.1 °C | 23.7 °C | 1452.89 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 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 |