Lee Center, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.7 °C (low) to 14.9 °C (high). Annual precipitation averages 965.7 Millimeters. Lee Center 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 | -10.7 °C | -1.6 °C | 44.7 mm |
| February | -8.6 °C | 0.9 °C | 44.45 mm |
| March | -2.9 °C | 7.9 °C | 60.45 mm |
| April | 2.9 °C | 15.5 °C | 89.15 mm |
| May | 9.5 °C | 21.9 °C | 122.68 mm |
| June | 14.9 °C | 26.8 °C | 131.83 mm |
| July | 16.8 °C | 28.4 °C | 105.41 mm |
| August | 15.6 °C | 27.4 °C | 99.82 mm |
| September | 11 °C | 24.3 °C | 87.12 mm |
| October | 4.6 °C | 17.1 °C | 70.61 mm |
| November | -1.4 °C | 8.6 °C | 58.42 mm |
| December | -7.2 °C | 1.4 °C | 51.05 mm |
| Annual | 3.7 °C | 14.9 °C | 965.69 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 |