Peoria, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.1 °F (low) to 62.3 °F (high). Annual precipitation averages 38.9 Inches. Peoria 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 | 17.0 °F | 33.3 °F | 2.11 in. |
| February | 20.4 °F | 38.1 °F | 2.05 in. |
| March | 30.3 °F | 50.4 °F | 2.59 in. |
| April | 41.1 °F | 63.2 °F | 3.88 in. |
| May | 52.6 °F | 73.9 °F | 4.65 in. |
| June | 62.0 °F | 82.9 °F | 4.67 in. |
| July | 65.6 °F | 86.1 °F | 3.98 in. |
| August | 63.3 °F | 84.6 °F | 3.42 in. |
| September | 54.9 °F | 78.9 °F | 3.52 in. |
| October | 42.8 °F | 66.0 °F | 3.19 in. |
| November | 31.9 °F | 51.2 °F | 2.7 in. |
| December | 22.7 °F | 38.7 °F | 2.09 in. |
| Annual | 42.1 °F | 62.3 °F | 38.85 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |