Minonk, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.8 °F (low) to 61.7 °F (high). Annual precipitation averages 37.5 Inches. 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 | 15.7 °F | 32.6 °F | 2.03 in. |
| February | 19.1 °F | 37.4 °F | 1.85 in. |
| March | 28.7 °F | 49.5 °F | 2.61 in. |
| April | 39.2 °F | 62.8 °F | 3.62 in. |
| May | 51.0 °F | 73.8 °F | 4.59 in. |
| June | 60.7 °F | 82.7 °F | 4.07 in. |
| July | 63.9 °F | 85.6 °F | 3.89 in. |
| August | 61.8 °F | 83.8 °F | 3.53 in. |
| September | 53.8 °F | 78.6 °F | 3.49 in. |
| October | 42.3 °F | 65.8 °F | 3.07 in. |
| November | 31.3 °F | 50.5 °F | 2.62 in. |
| December | 21.5 °F | 37.8 °F | 2.08 in. |
| Annual | 40.8 °F | 61.7 °F | 37.45 in. |
| 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 : -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 |