Woodstock, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38.7 °F (low) to 58.4 °F (high). Annual precipitation averages 38.6 Inches. 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 | 14.3 °F | 29.9 °F | 1.77 in. |
| February | 16.9 °F | 34.2 °F | 1.88 in. |
| March | 26.2 °F | 45.7 °F | 2.26 in. |
| April | 36.2 °F | 58.4 °F | 3.84 in. |
| May | 47.8 °F | 70.0 °F | 4.66 in. |
| June | 57.5 °F | 79.6 °F | 5.0 in. |
| July | 61.9 °F | 83.3 °F | 4.0 in. |
| August | 60.2 °F | 81.5 °F | 3.94 in. |
| September | 52.4 °F | 74.6 °F | 3.62 in. |
| October | 41.3 °F | 61.6 °F | 3.08 in. |
| November | 30.3 °F | 47.1 °F | 2.48 in. |
| December | 19.9 °F | 34.5 °F | 2.02 in. |
| Annual | 38.7 °F | 58.4 °F | 38.55 in. |
| 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 : -15°F to -10°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 |