Palos Heights, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.5 °C (low) to 15.7 °C (high). Annual precipitation averages 1012.2 Millimeters. Palos Heights is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.2 °C | 0.1 °C | 55.37 mm |
| February | -6.6 °C | 2.2 °C | 52.58 mm |
| March | -1.4 °C | 8.4 °C | 60.71 mm |
| April | 4.3 °C | 15.6 °C | 101.09 mm |
| May | 10.3 °C | 21.7 °C | 120.9 mm |
| June | 15.9 °C | 27.2 °C | 109.98 mm |
| July | 18.6 °C | 29.6 °C | 109.47 mm |
| August | 17.7 °C | 28.4 °C | 106.93 mm |
| September | 13.5 °C | 24.9 °C | 82.55 mm |
| October | 6.7 °C | 17.6 °C | 88.65 mm |
| November | 0.6 °C | 9.6 °C | 65.02 mm |
| December | -5 °C | 2.9 °C | 58.93 mm |
| Annual | 5.5 °C | 15.7 °C | 1012.18 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 |