Carthage, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.6 °C (low) to 16.6 °C (high). Annual precipitation averages 1160.3 Millimeters. Carthage is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.1 °C | 1.7 °C | 83.57 mm |
| February | -5.6 °C | 4 °C | 63.75 mm |
| March | -0.9 °C | 9.9 °C | 90.17 mm |
| April | 4.9 °C | 17 °C | 119.13 mm |
| May | 11.1 °C | 22.6 °C | 130.3 mm |
| June | 16.2 °C | 27.3 °C | 136.4 mm |
| July | 17.6 °C | 28.9 °C | 111 mm |
| August | 16.6 °C | 28.3 °C | 85.85 mm |
| September | 12.3 °C | 25.4 °C | 85.09 mm |
| October | 6.1 °C | 18.6 °C | 80.77 mm |
| November | 0.6 °C | 10.8 °C | 91.44 mm |
| December | -4.1 °C | 4.2 °C | 82.8 mm |
| Annual | 5.6 °C | 16.6 °C | 1160.27 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |