Wheeling, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.1 °C (low) to 14.8 °C (high). Annual precipitation averages 955.6 Millimeters. Wheeling is located in USDA Plant Hardiness Zone 6a. 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 | -8.6 °C | -0.4 °C | 52.07 mm |
| February | -7.1 °C | 1.6 °C | 50.29 mm |
| March | -2 °C | 7.4 °C | 57.66 mm |
| April | 3.7 °C | 14.1 °C | 96.27 mm |
| May | 9.7 °C | 20.4 °C | 112.52 mm |
| June | 15.3 °C | 26.1 °C | 111.51 mm |
| July | 18.3 °C | 28.6 °C | 93.73 mm |
| August | 17.6 °C | 27.5 °C | 100.33 mm |
| September | 13.2 °C | 23.9 °C | 83.57 mm |
| October | 6.5 °C | 16.8 °C | 83.06 mm |
| November | 0.2 °C | 8.9 °C | 60.96 mm |
| December | -5.3 °C | 2.5 °C | 53.59 mm |
| Annual | 5.1 °C | 14.8 °C | 955.56 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 |