Sioux Center, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36 °F (low) to 57.6 °F (high). Annual precipitation averages 29.4 Inches. 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 | 7.6 °F | 26.1 °F | 0.68 in. |
| February | 12.1 °F | 31.2 °F | 0.82 in. |
| March | 23.4 °F | 43.9 °F | 1.68 in. |
| April | 34.7 °F | 58.9 °F | 3.01 in. |
| May | 47.7 °F | 71.2 °F | 4.08 in. |
| June | 58.5 °F | 81.0 °F | 4.47 in. |
| July | 61.9 °F | 83.8 °F | 3.4 in. |
| August | 59.4 °F | 81.6 °F | 3.39 in. |
| September | 50.6 °F | 75.5 °F | 3.13 in. |
| October | 37.8 °F | 62.2 °F | 2.44 in. |
| November | 24.6 °F | 44.9 °F | 1.37 in. |
| December | 13.5 °F | 30.7 °F | 0.97 in. |
| Annual | 36 °F | 57.6 °F | 29.44 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 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |