Kellyton, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.3 °C (low) to 23.5 °C (high). Annual precipitation averages 1433.6 Millimeters. Kellyton 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 | 0.3 °C | 13.1 °C | 139.19 mm |
| February | 2 °C | 15.4 °C | 137.92 mm |
| March | 5.3 °C | 19.8 °C | 141.99 mm |
| April | 9.2 °C | 23.8 °C | 123.95 mm |
| May | 14.2 °C | 27.7 °C | 109.47 mm |
| June | 18.7 °C | 30.8 °C | 122.43 mm |
| July | 20.6 °C | 32.4 °C | 128.27 mm |
| August | 20.1 °C | 32 °C | 110.49 mm |
| September | 16.8 °C | 29.4 °C | 88.39 mm |
| October | 10.3 °C | 24.4 °C | 81.53 mm |
| November | 4.4 °C | 18.7 °C | 108.2 mm |
| December | 1.7 °C | 14.3 °C | 141.73 mm |
| Annual | 10.3 °C | 23.5 °C | 1433.56 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 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |