Carthage, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 34.3 °F (low) to 56.7 °F (high). Annual precipitation averages 24.7 Inches. 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 | 6.0 °F | 25.1 °F | 0.47 in. |
| February | 9.9 °F | 30.3 °F | 0.69 in. |
| March | 21.1 °F | 42.7 °F | 1.11 in. |
| April | 32.9 °F | 57.2 °F | 2.71 in. |
| May | 45.5 °F | 69.1 °F | 3.42 in. |
| June | 56.8 °F | 79.5 °F | 4.03 in. |
| July | 60.8 °F | 85.1 °F | 3.23 in. |
| August | 58.8 °F | 83.1 °F | 2.92 in. |
| September | 50.3 °F | 75.1 °F | 2.64 in. |
| October | 35.9 °F | 60.2 °F | 2.01 in. |
| November | 22.2 °F | 43.4 °F | 0.83 in. |
| December | 10.9 °F | 29.7 °F | 0.63 in. |
| Annual | 34.3 °F | 56.7 °F | 24.69 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |