North Sioux City, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3 °C (low) to 15.4 °C (high). Annual precipitation averages 729.2 Millimeters. North Sioux City is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.4 °C | -1.7 °C | 15.49 mm |
| February | -10.1 °C | 1.2 °C | 19.05 mm |
| March | -3.8 °C | 8.4 °C | 39.12 mm |
| April | 2.3 °C | 16.1 °C | 79.25 mm |
| May | 9.3 °C | 22.3 °C | 101.6 mm |
| June | 15.4 °C | 27.9 °C | 114.05 mm |
| July | 17.4 °C | 29.7 °C | 82.55 mm |
| August | 16.1 °C | 28.6 °C | 86.11 mm |
| September | 10.8 °C | 25.1 °C | 75.69 mm |
| October | 3.6 °C | 17.7 °C | 60.45 mm |
| November | -3.6 °C | 8.6 °C | 32.26 mm |
| December | -9.4 °C | 1 °C | 23.62 mm |
| Annual | 3 °C | 15.4 °C | 729.24 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |