Lynwood, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.8 °F (low) to 59.7 °F (high). Annual precipitation averages 40.4 Inches. Lynwood 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.6 °F | 32.3 °F | 2.26 in. |
| February | 20.3 °F | 36.1 °F | 2.23 in. |
| March | 29.3 °F | 46.7 °F | 2.35 in. |
| April | 39.4 °F | 59.2 °F | 3.86 in. |
| May | 50.3 °F | 69.9 °F | 4.39 in. |
| June | 60.3 °F | 79.7 °F | 4.76 in. |
| July | 64.9 °F | 83.8 °F | 4.27 in. |
| August | 63.3 °F | 82.0 °F | 4.2 in. |
| September | 55.6 °F | 76.0 °F | 3.33 in. |
| October | 43.8 °F | 63.3 °F | 3.56 in. |
| November | 33.0 °F | 49.4 °F | 2.81 in. |
| December | 23.2 °F | 37.4 °F | 2.33 in. |
| Annual | 41.8 °F | 59.7 °F | 40.35 in. |
| 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |