Kildeer, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.4 °C (low) to 14.7 °C (high). Annual precipitation averages 965 Millimeters. Kildeer is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.4 °C | -0.9 °C | 49.53 mm |
| February | -7.9 °C | 1.2 °C | 50.04 mm |
| March | -2.7 °C | 7.4 °C | 57.66 mm |
| April | 3 °C | 14.4 °C | 96.27 mm |
| May | 9.1 °C | 20.7 °C | 116.33 mm |
| June | 14.6 °C | 26.3 °C | 114.81 mm |
| July | 17.5 °C | 28.7 °C | 96.52 mm |
| August | 16.7 °C | 27.5 °C | 102.11 mm |
| September | 12.3 °C | 23.7 °C | 85.09 mm |
| October | 5.7 °C | 16.6 °C | 82.55 mm |
| November | -0.5 °C | 8.7 °C | 60.45 mm |
| December | -6.1 °C | 2.1 °C | 53.59 mm |
| Annual | 4.4 °C | 14.7 °C | 964.95 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°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 |