Forestdale, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52.7 °F (low) to 73.5 °F (high). Annual precipitation averages 58.7 Inches. Forestdale 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 | 34.3 °F | 53.8 °F | 5.26 in. |
| February | 36.8 °F | 58.3 °F | 5.54 in. |
| March | 43.8 °F | 66.4 °F | 5.72 in. |
| April | 51.1 °F | 74.2 °F | 5.12 in. |
| May | 60.2 °F | 81.1 °F | 4.49 in. |
| June | 67.8 °F | 87.2 °F | 4.88 in. |
| July | 71.0 °F | 90.2 °F | 5.14 in. |
| August | 70.4 °F | 89.7 °F | 4.33 in. |
| September | 64.8 °F | 85.3 °F | 4.54 in. |
| October | 53.2 °F | 75.1 °F | 3.43 in. |
| November | 42.5 °F | 64.4 °F | 4.89 in. |
| December | 36.7 °F | 56.2 °F | 5.34 in. |
| Annual | 52.7 °F | 73.5 °F | 58.68 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |