Nisland, South Dakota has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 33.4 °F (low) to 59.9 °F (high). Annual precipitation averages 18 Inches. 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 | 10.8 °F | 34.4 °F | 0.42 in. |
| February | 13.7 °F | 37.4 °F | 0.53 in. |
| March | 22.7 °F | 48.1 °F | 0.95 in. |
| April | 31.3 °F | 58.1 °F | 2.0 in. |
| May | 42.0 °F | 67.4 °F | 3.4 in. |
| June | 52.0 °F | 78.5 °F | 3.02 in. |
| July | 58.5 °F | 87.0 °F | 2.11 in. |
| August | 56.2 °F | 86.4 °F | 1.47 in. |
| September | 46.0 °F | 76.6 °F | 1.21 in. |
| October | 33.0 °F | 61.6 °F | 1.68 in. |
| November | 21.6 °F | 46.9 °F | 0.63 in. |
| December | 12.6 °F | 36.2 °F | 0.56 in. |
| Annual | 33.4 °F | 59.9 °F | 17.98 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 | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |