Summerdale, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.9 °C (low) to 24.9 °C (high). Annual precipitation averages 1768.9 Millimeters. 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 | 4.3 °C | 16.1 °C | 137.41 mm |
| February | 6.2 °C | 18.1 °C | 119.38 mm |
| March | 9.5 °C | 21.3 °C | 137.67 mm |
| April | 13.1 °C | 24.8 °C | 150.37 mm |
| May | 17.6 °C | 28.5 °C | 114.55 mm |
| June | 21.9 °C | 31.2 °C | 179.58 mm |
| July | 22.9 °C | 31.9 °C | 214.88 mm |
| August | 22.6 °C | 31.9 °C | 187.96 mm |
| September | 20 °C | 30.4 °C | 162.81 mm |
| October | 14.2 °C | 26.4 °C | 112.78 mm |
| November | 8.6 °C | 21.2 °C | 116.84 mm |
| December | 5.8 °C | 17.3 °C | 134.62 mm |
| Annual | 13.9 °C | 24.9 °C | 1768.85 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |