Cisne, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.4 °C (low) to 18.7 °C (high). Annual precipitation averages 1169.7 Millimeters. Cisne is located in USDA Plant Hardiness Zone 6b. 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 | -5 °C | 4 °C | 86.36 mm |
| February | -3.4 °C | 6.7 °C | 66.29 mm |
| March | 1.3 °C | 12.4 °C | 97.28 mm |
| April | 7.1 °C | 19.2 °C | 129.79 mm |
| May | 12.9 °C | 24.5 °C | 126.24 mm |
| June | 17.8 °C | 29.3 °C | 123.7 mm |
| July | 19.4 °C | 30.9 °C | 101.35 mm |
| August | 18.1 °C | 30.4 °C | 86.11 mm |
| September | 13.7 °C | 27.2 °C | 84.33 mm |
| October | 7.4 °C | 20.8 °C | 86.61 mm |
| November | 1.7 °C | 12.7 °C | 101.85 mm |
| December | -2.6 °C | 6.3 °C | 79.76 mm |
| Annual | 7.4 °C | 18.7 °C | 1169.67 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |