Minooka, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.8 °C (low) to 15.6 °C (high). Annual precipitation averages 990.1 Millimeters. Minooka 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 | -8.9 °C | -0.4 °C | 54.36 mm |
| February | -7.4 °C | 1.8 °C | 46.74 mm |
| March | -2.1 °C | 8.6 °C | 60.96 mm |
| April | 3.9 °C | 15.9 °C | 98.04 mm |
| May | 10.1 °C | 21.9 °C | 120.65 mm |
| June | 15.6 °C | 27.2 °C | 117.86 mm |
| July | 17.6 °C | 29.1 °C | 106.68 mm |
| August | 16.8 °C | 28.2 °C | 100.84 mm |
| September | 12.3 °C | 25.1 °C | 86.11 mm |
| October | 5.7 °C | 17.8 °C | 79.76 mm |
| November | -0.3 °C | 9.5 °C | 63.25 mm |
| December | -5.8 °C | 2.6 °C | 54.86 mm |
| Annual | 4.8 °C | 15.6 °C | 990.11 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 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 |