Summerdale, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 57 °F (low) to 76.8 °F (high). Annual precipitation averages 69.6 Inches. Summerdale is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 39.7 °F | 60.9 °F | 5.41 in. |
| February | 43.2 °F | 64.5 °F | 4.7 in. |
| March | 49.1 °F | 70.3 °F | 5.42 in. |
| April | 55.6 °F | 76.6 °F | 5.92 in. |
| May | 63.6 °F | 83.3 °F | 4.51 in. |
| June | 71.4 °F | 88.1 °F | 7.07 in. |
| July | 73.2 °F | 89.5 °F | 8.46 in. |
| August | 72.6 °F | 89.4 °F | 7.4 in. |
| September | 68.0 °F | 86.7 °F | 6.41 in. |
| October | 57.6 °F | 79.5 °F | 4.44 in. |
| November | 47.4 °F | 70.1 °F | 4.6 in. |
| December | 42.4 °F | 63.2 °F | 5.3 in. |
| Annual | 57 °F | 76.8 °F | 69.64 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |