Hetland, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 33.7 °F (low) to 54.7 °F (high). Annual precipitation averages 26.4 Inches. 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 | 4.7 °F | 23.1 °F | 0.63 in. |
| February | 8.9 °F | 28.1 °F | 0.79 in. |
| March | 20.4 °F | 40.2 °F | 1.17 in. |
| April | 32.6 °F | 55.6 °F | 2.47 in. |
| May | 45.4 °F | 68.0 °F | 3.77 in. |
| June | 56.3 °F | 77.6 °F | 4.24 in. |
| July | 60.5 °F | 82.5 °F | 3.36 in. |
| August | 58.1 °F | 80.2 °F | 3.27 in. |
| September | 49.4 °F | 73.0 °F | 2.71 in. |
| October | 35.7 °F | 58.6 °F | 2.14 in. |
| November | 22.3 °F | 41.8 °F | 0.99 in. |
| December | 10.6 °F | 28.0 °F | 0.81 in. |
| Annual | 33.7 °F | 54.7 °F | 26.35 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 |