Orland Hills, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.1 °C (low) to 15.8 °C (high). Annual precipitation averages 1020.3 Millimeters. Orland Hills 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.6 °C | 0.2 °C | 55.88 mm |
| February | -7.1 °C | 2.3 °C | 52.83 mm |
| March | -1.8 °C | 8.7 °C | 61.72 mm |
| April | 4.1 °C | 15.7 °C | 100.33 mm |
| May | 10 °C | 21.8 °C | 120.65 mm |
| June | 15.6 °C | 27.2 °C | 114.05 mm |
| July | 18.1 °C | 29.6 °C | 113.28 mm |
| August | 17.2 °C | 28.4 °C | 106.43 mm |
| September | 13.1 °C | 25 °C | 84.33 mm |
| October | 6.2 °C | 17.6 °C | 88.65 mm |
| November | 0.2 °C | 9.7 °C | 65.02 mm |
| December | -5.5 °C | 2.9 °C | 57.15 mm |
| Annual | 5.1 °C | 15.8 °C | 1020.32 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 |