Clayton, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.8 °C (low) to 24.5 °C (high). Annual precipitation averages 1416.1 Millimeters. Clayton is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2 °C | 14.6 °C | 124.21 mm |
| February | 3.8 °C | 16.8 °C | 122.68 mm |
| March | 7 °C | 20.8 °C | 132.84 mm |
| April | 10.6 °C | 24.7 °C | 111.25 mm |
| May | 15.6 °C | 28.8 °C | 88.39 mm |
| June | 19.5 °C | 31.6 °C | 137.92 mm |
| July | 21.2 °C | 32.8 °C | 155.45 mm |
| August | 20.7 °C | 32.4 °C | 124.46 mm |
| September | 18.1 °C | 30.1 °C | 102.62 mm |
| October | 12.4 °C | 25.5 °C | 73.15 mm |
| November | 6.6 °C | 19.9 °C | 102.11 mm |
| December | 3.7 °C | 15.8 °C | 140.97 mm |
| Annual | 11.8 °C | 24.5 °C | 1416.05 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |