Little Sioux, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38.1 °F (low) to 60.9 °F (high). Annual precipitation averages 34.2 Inches. Little Sioux 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 | 11.2 °F | 30.8 °F | 0.74 in. |
| February | 15.0 °F | 35.6 °F | 0.96 in. |
| March | 26.1 °F | 48.9 °F | 1.95 in. |
| April | 37.0 °F | 62.3 °F | 3.62 in. |
| May | 49.5 °F | 72.9 °F | 4.63 in. |
| June | 60.4 °F | 83.0 °F | 5.11 in. |
| July | 64.0 °F | 86.3 °F | 3.84 in. |
| August | 61.1 °F | 83.9 °F | 4.27 in. |
| September | 51.9 °F | 77.9 °F | 3.77 in. |
| October | 38.9 °F | 64.7 °F | 2.48 in. |
| November | 26.3 °F | 49.2 °F | 1.55 in. |
| December | 16.1 °F | 35.2 °F | 1.3 in. |
| Annual | 38.1 °F | 60.9 °F | 34.22 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |