Hetland, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1 °C (low) to 12.6 °C (high). Annual precipitation averages 669.3 Millimeters. Hetland 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 | -15.2 °C | -4.9 °C | 16 mm |
| February | -12.8 °C | -2.2 °C | 20.07 mm |
| March | -6.4 °C | 4.6 °C | 29.72 mm |
| April | 0.3 °C | 13.1 °C | 62.74 mm |
| May | 7.4 °C | 20 °C | 95.76 mm |
| June | 13.5 °C | 25.3 °C | 107.7 mm |
| July | 15.8 °C | 28.1 °C | 85.34 mm |
| August | 14.5 °C | 26.8 °C | 83.06 mm |
| September | 9.7 °C | 22.8 °C | 68.83 mm |
| October | 2.1 °C | 14.8 °C | 54.36 mm |
| November | -5.4 °C | 5.4 °C | 25.15 mm |
| December | -11.9 °C | -2.2 °C | 20.57 mm |
| Annual | 1 °C | 12.6 °C | 669.3 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 |