Wentworth, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 34.2 °F (low) to 54.9 °F (high). Annual precipitation averages 27 Inches. Wentworth 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.7 °F | 23.8 °F | 0.55 in. |
| February | 9.7 °F | 28.5 °F | 0.79 in. |
| March | 20.9 °F | 40.7 °F | 1.26 in. |
| April | 33.0 °F | 55.4 °F | 2.81 in. |
| May | 45.8 °F | 67.9 °F | 3.63 in. |
| June | 56.9 °F | 77.8 °F | 4.28 in. |
| July | 60.8 °F | 82.3 °F | 3.35 in. |
| August | 58.2 °F | 79.7 °F | 3.31 in. |
| September | 49.4 °F | 73.0 °F | 3.01 in. |
| October | 35.9 °F | 59.0 °F | 2.08 in. |
| November | 22.5 °F | 42.2 °F | 1.05 in. |
| December | 11.4 °F | 28.7 °F | 0.85 in. |
| Annual | 34.2 °F | 54.9 °F | 26.97 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| 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 |