Peotone, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.1 °C (low) to 15.6 °C (high). Annual precipitation averages 1046 Millimeters. Peotone is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.6 °C | -0.1 °C | 57.4 mm |
| February | -7 °C | 2.2 °C | 52.07 mm |
| March | -1.8 °C | 8.5 °C | 61.21 mm |
| April | 4.1 °C | 15.6 °C | 97.79 mm |
| May | 10.1 °C | 21.7 °C | 118.11 mm |
| June | 15.6 °C | 27.1 °C | 123.44 mm |
| July | 17.9 °C | 29.1 °C | 120.4 mm |
| August | 16.9 °C | 28.1 °C | 107.95 mm |
| September | 12.7 °C | 24.7 °C | 88.9 mm |
| October | 6 °C | 17.5 °C | 89.41 mm |
| November | 0.1 °C | 9.7 °C | 71.37 mm |
| December | -5.4 °C | 2.8 °C | 57.91 mm |
| Annual | 5.1 °C | 15.6 °C | 1045.96 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°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 |