Green Oaks, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.1 °F (low) to 57.6 °F (high). Annual precipitation averages 38.3 Inches. Green Oaks 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.6 °F | 30.8 °F | 2.09 in. |
| February | 19.3 °F | 34.2 °F | 2.04 in. |
| March | 28.1 °F | 44.3 °F | 2.27 in. |
| April | 38.4 °F | 55.6 °F | 3.89 in. |
| May | 48.8 °F | 67.1 °F | 4.48 in. |
| June | 58.9 °F | 77.2 °F | 4.33 in. |
| July | 64.6 °F | 82.0 °F | 3.7 in. |
| August | 63.7 °F | 80.6 °F | 3.77 in. |
| September | 55.9 °F | 73.9 °F | 3.8 in. |
| October | 44.1 °F | 61.5 °F | 3.25 in. |
| November | 32.7 °F | 47.7 °F | 2.54 in. |
| December | 22.5 °F | 36.1 °F | 2.13 in. |
| Annual | 41.1 °F | 57.6 °F | 38.29 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 |