Carlton, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12 °C (low) to 25.1 °C (high). Annual precipitation averages 1563.1 Millimeters. Carlton 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 | 2.4 °C | 15.6 °C | 146.3 mm |
| February | 4.2 °C | 17.8 °C | 130.3 mm |
| March | 7.4 °C | 21.8 °C | 141.22 mm |
| April | 11 °C | 25.2 °C | 118.11 mm |
| May | 16.1 °C | 29.2 °C | 114.05 mm |
| June | 19.7 °C | 31.9 °C | 153.16 mm |
| July | 21.8 °C | 32.8 °C | 157.99 mm |
| August | 21.3 °C | 32.6 °C | 135.38 mm |
| September | 18.8 °C | 30.5 °C | 116.33 mm |
| October | 11.9 °C | 26.2 °C | 90.68 mm |
| November | 5.9 °C | 20.9 °C | 114.55 mm |
| December | 3.6 °C | 16.9 °C | 145.03 mm |
| Annual | 12 °C | 25.1 °C | 1563.1 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 |