Mossville, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.2 °C (low) to 16.6 °C (high). Annual precipitation averages 985.5 Millimeters. Mossville is located in USDA Plant Hardiness Zone 6a. 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 | -8.8 °C | 0.3 °C | 53.59 mm |
| February | -6.9 °C | 2.9 °C | 51.05 mm |
| March | -1.3 °C | 9.9 °C | 65.53 mm |
| April | 4.6 °C | 17.4 °C | 98.04 mm |
| May | 10.8 °C | 23.3 °C | 120.9 mm |
| June | 16.1 °C | 28.3 °C | 116.08 mm |
| July | 18.2 °C | 29.9 °C | 97.54 mm |
| August | 17.1 °C | 29.1 °C | 89.66 mm |
| September | 12.5 °C | 25.9 °C | 90.93 mm |
| October | 5.9 °C | 18.9 °C | 79.25 mm |
| November | -0.2 °C | 10.4 °C | 69.09 mm |
| December | -5.5 °C | 3.3 °C | 53.85 mm |
| Annual | 5.2 °C | 16.6 °C | 985.51 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 6a : -23.3°C to -20.6°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 |