Evergreen Park, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.1 °F (low) to 59.7 °F (high). Annual precipitation averages 39.8 Inches. Evergreen Park is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.3 °F | 32.3 °F | 2.17 in. |
| February | 21.1 °F | 36.0 °F | 2.07 in. |
| March | 30.2 °F | 46.6 °F | 2.37 in. |
| April | 40.5 °F | 58.9 °F | 3.92 in. |
| May | 51.4 °F | 70.0 °F | 4.64 in. |
| June | 61.6 °F | 80.0 °F | 4.33 in. |
| July | 66.9 °F | 84.3 °F | 4.46 in. |
| August | 65.3 °F | 82.5 °F | 4.16 in. |
| September | 57.8 °F | 76.1 °F | 3.23 in. |
| October | 45.4 °F | 63.3 °F | 3.48 in. |
| November | 34.2 °F | 49.3 °F | 2.61 in. |
| December | 24.1 °F | 37.4 °F | 2.34 in. |
| Annual | 43.1 °F | 59.7 °F | 39.78 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |