Nisland, South Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 0.8 °C (low) to 15.5 °C (high). Annual precipitation averages 456.7 Millimeters. Nisland 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 | -11.8 °C | 1.3 °C | 10.67 mm |
| February | -10.2 °C | 3 °C | 13.46 mm |
| March | -5.2 °C | 8.9 °C | 24.13 mm |
| April | -0.4 °C | 14.5 °C | 50.8 mm |
| May | 5.6 °C | 19.7 °C | 86.36 mm |
| June | 11.1 °C | 25.8 °C | 76.71 mm |
| July | 14.7 °C | 30.6 °C | 53.59 mm |
| August | 13.4 °C | 30.2 °C | 37.34 mm |
| September | 7.8 °C | 24.8 °C | 30.73 mm |
| October | 0.6 °C | 16.4 °C | 42.67 mm |
| November | -5.8 °C | 8.3 °C | 16 mm |
| December | -10.8 °C | 2.3 °C | 14.22 mm |
| Annual | 0.8 °C | 15.5 °C | 456.68 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 | BSk - Cold Semi-Arid Climate |