Minooka, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.6 °F (low) to 60.1 °F (high). Annual precipitation averages 39 Inches. 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 | 15.9 °F | 31.3 °F | 2.14 in. |
| February | 18.7 °F | 35.3 °F | 1.84 in. |
| March | 28.3 °F | 47.4 °F | 2.4 in. |
| April | 39.0 °F | 60.7 °F | 3.86 in. |
| May | 50.1 °F | 71.5 °F | 4.75 in. |
| June | 60.0 °F | 81.0 °F | 4.64 in. |
| July | 63.7 °F | 84.4 °F | 4.2 in. |
| August | 62.2 °F | 82.7 °F | 3.97 in. |
| September | 54.2 °F | 77.1 °F | 3.39 in. |
| October | 42.2 °F | 64.0 °F | 3.14 in. |
| November | 31.5 °F | 49.1 °F | 2.49 in. |
| December | 21.6 °F | 36.6 °F | 2.16 in. |
| Annual | 40.6 °F | 60.1 °F | 38.98 in. |
| 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 : -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 |