Cicero, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.4 °F (low) to 59.4 °F (high). Annual precipitation averages 39.8 Inches. Cicero is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.6 °F | 31.9 °F | 2.18 in. |
| February | 21.4 °F | 35.6 °F | 2.07 in. |
| March | 30.3 °F | 46.1 °F | 2.35 in. |
| April | 40.5 °F | 58.6 °F | 3.97 in. |
| May | 51.5 °F | 69.7 °F | 4.68 in. |
| June | 61.7 °F | 79.7 °F | 4.35 in. |
| July | 67.2 °F | 84.2 °F | 4.44 in. |
| August | 66.1 °F | 82.3 °F | 4.11 in. |
| September | 58.6 °F | 75.9 °F | 3.26 in. |
| October | 46.1 °F | 63.1 °F | 3.46 in. |
| November | 34.5 °F | 48.9 °F | 2.57 in. |
| December | 24.3 °F | 37.2 °F | 2.33 in. |
| Annual | 43.4 °F | 59.4 °F | 39.77 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |