Sioux Center, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.2 °C (low) to 14.2 °C (high). Annual precipitation averages 747.8 Millimeters. Sioux Center is located in USDA Plant Hardiness Zone 5a. 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 | -13.6 °C | -3.3 °C | 17.27 mm |
| February | -11.1 °C | -0.4 °C | 20.83 mm |
| March | -4.8 °C | 6.6 °C | 42.67 mm |
| April | 1.5 °C | 14.9 °C | 76.45 mm |
| May | 8.7 °C | 21.8 °C | 103.63 mm |
| June | 14.7 °C | 27.2 °C | 113.54 mm |
| July | 16.6 °C | 28.8 °C | 86.36 mm |
| August | 15.2 °C | 27.6 °C | 86.11 mm |
| September | 10.3 °C | 24.2 °C | 79.5 mm |
| October | 3.2 °C | 16.8 °C | 61.98 mm |
| November | -4.1 °C | 7.2 °C | 34.8 mm |
| December | -10.3 °C | -0.7 °C | 24.64 mm |
| Annual | 2.2 °C | 14.2 °C | 747.78 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 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |