Peoria Heights, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.9 °C (low) to 16.2 °C (high). Annual precipitation averages 996.7 Millimeters. Peoria Heights 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 | -9.2 °C | 0.1 °C | 54.36 mm |
| February | -7.2 °C | 2.7 °C | 52.32 mm |
| March | -1.7 °C | 9.5 °C | 66.29 mm |
| April | 4.3 °C | 16.8 °C | 99.31 mm |
| May | 10.7 °C | 22.7 °C | 117.35 mm |
| June | 16.1 °C | 27.7 °C | 121.16 mm |
| July | 17.9 °C | 29.4 °C | 100.84 mm |
| August | 16.8 °C | 28.6 °C | 87.63 mm |
| September | 12.2 °C | 25.4 °C | 91.95 mm |
| October | 5.7 °C | 18.3 °C | 81.79 mm |
| November | -0.6 °C | 10.1 °C | 69.6 mm |
| December | -5.9 °C | 3 °C | 54.1 mm |
| Annual | 4.9 °C | 16.2 °C | 996.7 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 |