Maquon, 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 16.2 °C (high). Annual precipitation averages 973.6 Millimeters. Maquon 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 | -9.4 °C | -0.1 °C | 47.75 mm |
| February | -7.5 °C | 2.5 °C | 49.78 mm |
| March | -1.8 °C | 9.7 °C | 62.74 mm |
| April | 4.1 °C | 16.9 °C | 94.74 mm |
| May | 10.8 °C | 22.8 °C | 127.76 mm |
| June | 16.2 °C | 27.7 °C | 118.87 mm |
| July | 17.9 °C | 29.4 °C | 102.11 mm |
| August | 16.7 °C | 28.6 °C | 90.42 mm |
| September | 12.1 °C | 25.3 °C | 93.98 mm |
| October | 5.4 °C | 18.3 °C | 73.66 mm |
| November | -0.8 °C | 9.9 °C | 61.72 mm |
| December | -6.1 °C | 2.9 °C | 50.04 mm |
| Annual | 4.8 °C | 16.2 °C | 973.57 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 |