Gadsden, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.5 °C (low) to 22.8 °C (high). Annual precipitation averages 1485.4 Millimeters. Gadsden is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.1 °C | 11.2 °C | 145.54 mm |
| February | 1.7 °C | 13.7 °C | 140.21 mm |
| March | 5.3 °C | 18.3 °C | 142.75 mm |
| April | 9.6 °C | 23.3 °C | 132.59 mm |
| May | 14.7 °C | 27.3 °C | 117.09 mm |
| June | 19.1 °C | 30.8 °C | 128.27 mm |
| July | 21.2 °C | 32.4 °C | 118.36 mm |
| August | 20.7 °C | 32.2 °C | 104.9 mm |
| September | 17.4 °C | 29.6 °C | 103.63 mm |
| October | 10.6 °C | 24.1 °C | 90.68 mm |
| November | 4.1 °C | 17.4 °C | 119.13 mm |
| December | 1.2 °C | 12.8 °C | 142.24 mm |
| Annual | 10.5 °C | 22.8 °C | 1485.39 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| 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 |