Hinckley, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4 °C (low) to 14.9 °C (high). Annual precipitation averages 959.4 Millimeters. Hinckley is located in USDA Plant Hardiness Zone 5b. 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 | -10.2 °C | -1.4 °C | 45.97 mm |
| February | -8.3 °C | 0.9 °C | 45.47 mm |
| March | -2.8 °C | 7.7 °C | 58.42 mm |
| April | 3.1 °C | 15.1 °C | 92.96 mm |
| May | 9.6 °C | 21.4 °C | 122.43 mm |
| June | 15.1 °C | 26.8 °C | 114.81 mm |
| July | 17.1 °C | 28.6 °C | 98.04 mm |
| August | 15.9 °C | 27.4 °C | 98.04 mm |
| September | 11.3 °C | 24.3 °C | 86.36 mm |
| October | 4.8 °C | 17.1 °C | 81.28 mm |
| November | -1.1 °C | 8.7 °C | 62.74 mm |
| December | -6.8 °C | 1.6 °C | 52.83 mm |
| Annual | 4 °C | 14.9 °C | 959.35 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |