De Soto, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.9 °C (low) to 15.6 °C (high). Annual precipitation averages 872.7 Millimeters. De Soto is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.2 °C | -1.1 °C | 23.11 mm |
| February | -8.9 °C | 1.7 °C | 28.96 mm |
| March | -2.9 °C | 8.8 °C | 49.78 mm |
| April | 3.4 °C | 16.3 °C | 89.41 mm |
| May | 10.1 °C | 22.2 °C | 117.6 mm |
| June | 15.7 °C | 27.4 °C | 131.57 mm |
| July | 18 °C | 29.7 °C | 101.35 mm |
| August | 16.4 °C | 28.7 °C | 102.36 mm |
| September | 11.6 °C | 25.3 °C | 85.34 mm |
| October | 4.8 °C | 17.7 °C | 64.77 mm |
| November | -2.1 °C | 9.1 °C | 45.21 mm |
| December | -8 °C | 1.8 °C | 33.27 mm |
| Annual | 3.9 °C | 15.6 °C | 872.73 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |