Wheeling, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.2 °F (low) to 58.6 °F (high). Annual precipitation averages 37.6 Inches. 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 | 16.5 °F | 31.2 °F | 2.05 in. |
| February | 19.2 °F | 34.9 °F | 1.98 in. |
| March | 28.4 °F | 45.3 °F | 2.27 in. |
| April | 38.6 °F | 57.4 °F | 3.79 in. |
| May | 49.5 °F | 68.7 °F | 4.43 in. |
| June | 59.5 °F | 79.0 °F | 4.39 in. |
| July | 65.0 °F | 83.4 °F | 3.69 in. |
| August | 63.7 °F | 81.5 °F | 3.95 in. |
| September | 55.7 °F | 75.0 °F | 3.29 in. |
| October | 43.7 °F | 62.3 °F | 3.27 in. |
| November | 32.4 °F | 48.1 °F | 2.4 in. |
| December | 22.5 °F | 36.5 °F | 2.11 in. |
| Annual | 41.2 °F | 58.6 °F | 37.62 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |