Carthage, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.4 °C (low) to 23.1 °C (high). Annual precipitation averages 1412.5 Millimeters. Carthage 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 | -0.6 °C | 11.2 °C | 109.98 mm |
| February | 1.2 °C | 13.8 °C | 119.38 mm |
| March | 5.1 °C | 18.6 °C | 139.19 mm |
| April | 9.7 °C | 23.7 °C | 144.02 mm |
| May | 15.1 °C | 27.4 °C | 137.41 mm |
| June | 19.5 °C | 31.4 °C | 97.28 mm |
| July | 21.4 °C | 33.3 °C | 101.85 mm |
| August | 20.7 °C | 33.2 °C | 85.6 mm |
| September | 16.8 °C | 29.9 °C | 94.49 mm |
| October | 10.1 °C | 24.1 °C | 122.68 mm |
| November | 4.6 °C | 17.5 °C | 115.57 mm |
| December | 0.9 °C | 12.6 °C | 145.03 mm |
| Annual | 10.4 °C | 23.1 °C | 1412.48 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 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |