Leighton, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10 °C (low) to 22.1 °C (high). Annual precipitation averages 1501.9 Millimeters. Leighton is located in USDA Plant Hardiness Zone 8a. 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 | -0.8 °C | 10.3 °C | 135.38 mm |
| February | 0.9 °C | 12.8 °C | 138.94 mm |
| March | 4.8 °C | 17.6 °C | 138.94 mm |
| April | 9.4 °C | 22.4 °C | 133.1 mm |
| May | 14.5 °C | 26.6 °C | 130.3 mm |
| June | 18.9 °C | 30.4 °C | 118.11 mm |
| July | 20.8 °C | 31.9 °C | 129.29 mm |
| August | 20.1 °C | 31.7 °C | 110.24 mm |
| September | 16.5 °C | 29.1 °C | 104.14 mm |
| October | 9.8 °C | 23.4 °C | 99.57 mm |
| November | 3.7 °C | 16.8 °C | 107.44 mm |
| December | 0.8 °C | 11.9 °C | 156.46 mm |
| Annual | 10 °C | 22.1 °C | 1501.91 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |