Carthage, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.3 °C (low) to 13.7 °C (high). Annual precipitation averages 627.1 Millimeters. Carthage is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.4 °C | -3.8 °C | 11.94 mm |
| February | -12.3 °C | -0.9 °C | 17.53 mm |
| March | -6.1 °C | 5.9 °C | 28.19 mm |
| April | 0.5 °C | 14 °C | 68.83 mm |
| May | 7.5 °C | 20.6 °C | 86.87 mm |
| June | 13.8 °C | 26.4 °C | 102.36 mm |
| July | 16 °C | 29.5 °C | 82.04 mm |
| August | 14.9 °C | 28.4 °C | 74.17 mm |
| September | 10.2 °C | 23.9 °C | 67.06 mm |
| October | 2.2 °C | 15.7 °C | 51.05 mm |
| November | -5.4 °C | 6.3 °C | 21.08 mm |
| December | -11.7 °C | -1.3 °C | 16 mm |
| Annual | 1.3 °C | 13.7 °C | 627.12 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |