Cissna Park, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.2 °C (low) to 16.5 °C (high). Annual precipitation averages 996.2 Millimeters. 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 | -8.2 °C | 0.6 °C | 56.13 mm |
| February | -6.5 °C | 3.2 °C | 48.77 mm |
| March | -1.3 °C | 9.7 °C | 67.56 mm |
| April | 4.4 °C | 17.2 °C | 99.06 mm |
| May | 10.8 °C | 23.2 °C | 113.28 mm |
| June | 16.1 °C | 27.9 °C | 119.89 mm |
| July | 17.7 °C | 29.3 °C | 112.27 mm |
| August | 16.4 °C | 28.4 °C | 89.15 mm |
| September | 12.2 °C | 25.9 °C | 77.47 mm |
| October | 5.9 °C | 18.8 °C | 83.82 mm |
| November | 0.1 °C | 10.4 °C | 71.63 mm |
| December | -5.1 °C | 3.3 °C | 57.15 mm |
| Annual | 5.2 °C | 16.5 °C | 996.18 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |