South English, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.1 °C (low) to 15.3 °C (high). Annual precipitation averages 959.4 Millimeters. South English 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 | -10.8 °C | -1.3 °C | 30.73 mm |
| February | -8.8 °C | 1.3 °C | 36.83 mm |
| March | -2.7 °C | 8.6 °C | 56.64 mm |
| April | 3.6 °C | 16.1 °C | 95.76 mm |
| May | 10.3 °C | 21.9 °C | 128.78 mm |
| June | 16.1 °C | 27.3 °C | 132.08 mm |
| July | 17.9 °C | 29.2 °C | 104.39 mm |
| August | 16.4 °C | 28.2 °C | 118.36 mm |
| September | 11.4 °C | 24.7 °C | 86.36 mm |
| October | 4.8 °C | 17.5 °C | 75.44 mm |
| November | -1.7 °C | 8.9 °C | 52.83 mm |
| December | -7.4 °C | 1.7 °C | 41.15 mm |
| Annual | 4.1 °C | 15.3 °C | 959.35 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 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |