Mazon, 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 15.8 °C (high). Annual precipitation averages 965.9 Millimeters. Mazon 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 °C | -0.3 °C | 52.07 mm |
| February | -7.3 °C | 2.1 °C | 46.48 mm |
| March | -1.9 °C | 8.8 °C | 61.47 mm |
| April | 3.9 °C | 16.2 °C | 92.2 mm |
| May | 10.2 °C | 22.3 °C | 118.36 mm |
| June | 15.7 °C | 27.4 °C | 117.09 mm |
| July | 17.7 °C | 29.1 °C | 103.38 mm |
| August | 16.6 °C | 28.1 °C | 96.77 mm |
| September | 12.1 °C | 25.2 °C | 84.33 mm |
| October | 5.6 °C | 17.9 °C | 77.72 mm |
| November | -0.3 °C | 9.6 °C | 63.75 mm |
| December | -5.8 °C | 2.6 °C | 52.32 mm |
| Annual | 4.8 °C | 15.8 °C | 965.94 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 |