Hinckley, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.2 °F (low) to 58.7 °F (high). Annual precipitation averages 37.8 Inches. 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 | 13.7 °F | 29.4 °F | 1.81 in. |
| February | 17.0 °F | 33.6 °F | 1.79 in. |
| March | 27.0 °F | 45.9 °F | 2.3 in. |
| April | 37.6 °F | 59.2 °F | 3.66 in. |
| May | 49.2 °F | 70.6 °F | 4.82 in. |
| June | 59.2 °F | 80.2 °F | 4.52 in. |
| July | 62.7 °F | 83.4 °F | 3.86 in. |
| August | 60.6 °F | 81.4 °F | 3.86 in. |
| September | 52.4 °F | 75.7 °F | 3.4 in. |
| October | 40.6 °F | 62.7 °F | 3.2 in. |
| November | 30.0 °F | 47.7 °F | 2.47 in. |
| December | 19.8 °F | 34.9 °F | 2.08 in. |
| Annual | 39.2 °F | 58.7 °F | 37.77 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |