Carthage, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.5 °C (low) to 21 °C (high). Annual precipitation averages 1379 Millimeters. Carthage is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.3 °C | 8.4 °C | 112.78 mm |
| February | -0.9 °C | 10.9 °C | 127.25 mm |
| March | 2.7 °C | 15.9 °C | 123.44 mm |
| April | 7.4 °C | 21.3 °C | 118.11 mm |
| May | 12.8 °C | 25.7 °C | 125.73 mm |
| June | 17.7 °C | 29.8 °C | 134.87 mm |
| July | 19.8 °C | 31.7 °C | 124.71 mm |
| August | 19 °C | 31.4 °C | 101.85 mm |
| September | 15.1 °C | 28.3 °C | 94.49 mm |
| October | 8.3 °C | 22.4 °C | 85.09 mm |
| November | 2.5 °C | 15.6 °C | 94.49 mm |
| December | -0.6 °C | 10.3 °C | 136.14 mm |
| Annual | 8.5 °C | 21 °C | 1378.95 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |