Cissna Park, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.4 °F (low) to 61.7 °F (high). Annual precipitation averages 39.2 Inches. Cissna 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.3 °F | 33.0 °F | 2.21 in. |
| February | 20.3 °F | 37.7 °F | 1.92 in. |
| March | 29.7 °F | 49.4 °F | 2.66 in. |
| April | 40.0 °F | 63.0 °F | 3.9 in. |
| May | 51.5 °F | 73.7 °F | 4.46 in. |
| June | 60.9 °F | 82.2 °F | 4.72 in. |
| July | 63.9 °F | 84.7 °F | 4.42 in. |
| August | 61.6 °F | 83.2 °F | 3.51 in. |
| September | 53.9 °F | 78.6 °F | 3.05 in. |
| October | 42.7 °F | 65.9 °F | 3.3 in. |
| November | 32.2 °F | 50.7 °F | 2.82 in. |
| December | 22.8 °F | 38.0 °F | 2.25 in. |
| Annual | 41.4 °F | 61.7 °F | 39.22 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 |