Western Springs, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.7 °F (low) to 60.2 °F (high). Annual precipitation averages 39.9 Inches. Western Springs 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 | 16.9 °F | 31.9 °F | 2.2 in. |
| February | 19.7 °F | 35.8 °F | 2.12 in. |
| March | 29.0 °F | 47.1 °F | 2.38 in. |
| April | 39.4 °F | 59.9 °F | 3.99 in. |
| May | 50.3 °F | 71.2 °F | 4.8 in. |
| June | 60.4 °F | 81.1 °F | 4.43 in. |
| July | 65.4 °F | 85.6 °F | 4.06 in. |
| August | 63.9 °F | 83.4 °F | 4.19 in. |
| September | 56.2 °F | 76.9 °F | 3.32 in. |
| October | 43.8 °F | 63.5 °F | 3.52 in. |
| November | 32.6 °F | 49.1 °F | 2.56 in. |
| December | 22.6 °F | 37.0 °F | 2.31 in. |
| Annual | 41.7 °F | 60.2 °F | 39.88 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 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |