Carbon Hill, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.7 °C (low) to 22.8 °C (high). Annual precipitation averages 1558.8 Millimeters. Carbon Hill 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 | 11.4 °C | 141.99 mm |
| February | 0.9 °C | 13.8 °C | 148.08 mm |
| March | 4.6 °C | 18.6 °C | 147.83 mm |
| April | 8.8 °C | 23.3 °C | 152.4 mm |
| May | 14.1 °C | 27.2 °C | 127.51 mm |
| June | 18.4 °C | 30.8 °C | 130.05 mm |
| July | 20.4 °C | 32.3 °C | 134.11 mm |
| August | 19.9 °C | 32.3 °C | 112.27 mm |
| September | 16.4 °C | 29.7 °C | 112.27 mm |
| October | 9.5 °C | 24.1 °C | 91.19 mm |
| November | 3.5 °C | 17.6 °C | 112.78 mm |
| December | 0.9 °C | 12.8 °C | 148.34 mm |
| Annual | 9.7 °C | 22.8 °C | 1558.82 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |