Woodstock, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.8 °C (low) to 14.6 °C (high). Annual precipitation averages 979.2 Millimeters. Woodstock 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 | -9.8 °C | -1.2 °C | 44.96 mm |
| February | -8.4 °C | 1.2 °C | 47.75 mm |
| March | -3.2 °C | 7.6 °C | 57.4 mm |
| April | 2.3 °C | 14.7 °C | 97.54 mm |
| May | 8.8 °C | 21.1 °C | 118.36 mm |
| June | 14.2 °C | 26.4 °C | 127 mm |
| July | 16.6 °C | 28.5 °C | 101.6 mm |
| August | 15.7 °C | 27.5 °C | 100.08 mm |
| September | 11.3 °C | 23.7 °C | 91.95 mm |
| October | 5.2 °C | 16.4 °C | 78.23 mm |
| November | -0.9 °C | 8.4 °C | 62.99 mm |
| December | -6.7 °C | 1.4 °C | 51.31 mm |
| Annual | 3.8 °C | 14.6 °C | 979.17 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |