Minonk, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.9 °C (low) to 16.5 °C (high). Annual precipitation averages 951.2 Millimeters. Minonk is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.1 °C | 0.3 °C | 51.56 mm |
| February | -7.2 °C | 3 °C | 46.99 mm |
| March | -1.8 °C | 9.7 °C | 66.29 mm |
| April | 4 °C | 17.1 °C | 91.95 mm |
| May | 10.6 °C | 23.2 °C | 116.59 mm |
| June | 15.9 °C | 28.2 °C | 103.38 mm |
| July | 17.7 °C | 29.8 °C | 98.81 mm |
| August | 16.6 °C | 28.8 °C | 89.66 mm |
| September | 12.1 °C | 25.9 °C | 88.65 mm |
| October | 5.7 °C | 18.8 °C | 77.98 mm |
| November | -0.4 °C | 10.3 °C | 66.55 mm |
| December | -5.8 °C | 3.2 °C | 52.83 mm |
| Annual | 4.9 °C | 16.5 °C | 951.24 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 |