Shorewood, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.9 °C (low) to 15.7 °C (high). Annual precipitation averages 1005.1 Millimeters. Shorewood is located in USDA Plant Hardiness Zone 5b. 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 | -8.9 °C | -0.2 °C | 53.85 mm |
| February | -7.3 °C | 2 °C | 48.77 mm |
| March | -1.9 °C | 8.7 °C | 62.23 mm |
| April | 3.8 °C | 15.9 °C | 99.57 mm |
| May | 9.9 °C | 22.1 °C | 121.67 mm |
| June | 15.6 °C | 27.3 °C | 118.36 mm |
| July | 17.7 °C | 29.2 °C | 108.2 mm |
| August | 16.9 °C | 28.2 °C | 104.14 mm |
| September | 12.4 °C | 25.1 °C | 87.12 mm |
| October | 5.8 °C | 17.8 °C | 83.31 mm |
| November | -0.2 °C | 9.6 °C | 62.74 mm |
| December | -5.6 °C | 2.7 °C | 55.12 mm |
| Annual | 4.9 °C | 15.7 °C | 1005.08 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 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 |