Gadsden, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.5 °C (low) to 21.2 °C (high). Annual precipitation averages 1399 Millimeters. Gadsden is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.8 °C | 8.5 °C | 105.41 mm |
| February | -0.1 °C | 11 °C | 120.65 mm |
| March | 4.1 °C | 16.1 °C | 136.65 mm |
| April | 9.2 °C | 21.7 °C | 132.08 mm |
| May | 14.7 °C | 26.1 °C | 145.54 mm |
| June | 19.2 °C | 30.2 °C | 109.47 mm |
| July | 20.9 °C | 31.8 °C | 105.41 mm |
| August | 19.8 °C | 31.6 °C | 93.73 mm |
| September | 15.8 °C | 28.4 °C | 100.33 mm |
| October | 9.1 °C | 22.7 °C | 99.82 mm |
| November | 3.7 °C | 15.8 °C | 114.05 mm |
| December | -0.1 °C | 10.2 °C | 135.89 mm |
| Annual | 9.5 °C | 21.2 °C | 1399.03 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |