Clayton, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.9 °C (low) to 25 °C (high). Annual precipitation averages 1527.6 Millimeters. Clayton is located in USDA Plant Hardiness Zone 9a. 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 | 3.1 °C | 14.4 °C | 149.61 mm |
| February | 4.4 °C | 16.9 °C | 136.91 mm |
| March | 8.7 °C | 21.2 °C | 141.73 mm |
| April | 12.6 °C | 25.1 °C | 138.94 mm |
| May | 17.3 °C | 29.2 °C | 120.14 mm |
| June | 21.2 °C | 32.2 °C | 126.24 mm |
| July | 22.5 °C | 33.3 °C | 119.13 mm |
| August | 21.9 °C | 33.7 °C | 111.76 mm |
| September | 18.9 °C | 31.2 °C | 104.65 mm |
| October | 12.4 °C | 26.6 °C | 107.19 mm |
| November | 7.2 °C | 20.4 °C | 130.56 mm |
| December | 4.2 °C | 15.7 °C | 140.72 mm |
| Annual | 12.9 °C | 25 °C | 1527.58 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 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 |