Corning, 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 15.9 °C (high). Annual precipitation averages 889.5 Millimeters. Corning 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 | -0.2 °C | 20.83 mm |
| February | -8.4 °C | 2.7 °C | 29.21 mm |
| March | -2.5 °C | 9.7 °C | 53.09 mm |
| April | 3.3 °C | 16.4 °C | 86.61 mm |
| May | 10.2 °C | 22.2 °C | 135.13 mm |
| June | 15.9 °C | 27.2 °C | 133.6 mm |
| July | 18.1 °C | 29.4 °C | 98.3 mm |
| August | 16.7 °C | 28.6 °C | 88.9 mm |
| September | 11.6 °C | 24.9 °C | 91.69 mm |
| October | 4.7 °C | 17.9 °C | 73.41 mm |
| November | -2.1 °C | 9.6 °C | 48.77 mm |
| December | -7.7 °C | 2.5 °C | 29.97 mm |
| Annual | 4.1 °C | 15.9 °C | 889.51 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 |