Castleberry, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.7 °C (low) to 25.2 °C (high). Annual precipitation averages 1617.5 Millimeters. Castleberry 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. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.1 °C | 15.6 °C | 150.62 mm |
| February | 3.9 °C | 18.1 °C | 127 mm |
| March | 7.2 °C | 21.9 °C | 146.3 mm |
| April | 10.7 °C | 25.3 °C | 128.78 mm |
| May | 15.4 °C | 29.1 °C | 112.27 mm |
| June | 19.9 °C | 31.8 °C | 153.42 mm |
| July | 21.2 °C | 32.8 °C | 170.94 mm |
| August | 21 °C | 32.6 °C | 144.53 mm |
| September | 18.3 °C | 30.7 °C | 125.22 mm |
| October | 11.8 °C | 26.1 °C | 96.77 mm |
| November | 5.8 °C | 20.9 °C | 117.35 mm |
| December | 3.6 °C | 16.9 °C | 144.27 mm |
| Annual | 11.7 °C | 25.2 °C | 1617.47 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 |