Castleberry, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 53.1 °F (low) to 77.3 °F (high). Annual precipitation averages 63.7 Inches. 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 | 35.7 °F | 60.1 °F | 5.93 in. |
| February | 39.0 °F | 64.5 °F | 5.0 in. |
| March | 45.0 °F | 71.4 °F | 5.76 in. |
| April | 51.2 °F | 77.6 °F | 5.07 in. |
| May | 59.7 °F | 84.4 °F | 4.42 in. |
| June | 67.8 °F | 89.3 °F | 6.04 in. |
| July | 70.1 °F | 91.1 °F | 6.73 in. |
| August | 69.8 °F | 90.6 °F | 5.69 in. |
| September | 64.9 °F | 87.2 °F | 4.93 in. |
| October | 53.3 °F | 78.9 °F | 3.81 in. |
| November | 42.5 °F | 69.6 °F | 4.62 in. |
| December | 38.4 °F | 62.4 °F | 5.68 in. |
| Annual | 53.1 °F | 77.3 °F | 63.68 in. |
| 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 : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |