Cottonwood, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.4 °C (low) to 25.7 °C (high). Annual precipitation averages 1475 Millimeters. Cottonwood is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.8 °C | 16.4 °C | 126.24 mm |
| February | 5.6 °C | 18.4 °C | 136.4 mm |
| March | 8.7 °C | 22.3 °C | 131.06 mm |
| April | 12.6 °C | 25.9 °C | 122.43 mm |
| May | 17.4 °C | 30.1 °C | 93.47 mm |
| June | 21.3 °C | 32.2 °C | 141.99 mm |
| July | 22.4 °C | 33.2 °C | 158.24 mm |
| August | 22.3 °C | 32.8 °C | 140.21 mm |
| September | 19.8 °C | 30.9 °C | 119.89 mm |
| October | 13.9 °C | 26.9 °C | 75.95 mm |
| November | 7.8 °C | 21.5 °C | 100.58 mm |
| December | 5.3 °C | 17.6 °C | 128.52 mm |
| Annual | 13.4 °C | 25.7 °C | 1474.98 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| 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 |