Piper City, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.6 °F (low) to 61.6 °F (high). Annual precipitation averages 39.2 Inches. Piper City is located in USDA Plant Hardiness Zone 6a. 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 | 16.2 °F | 32.5 °F | 2.36 in. |
| February | 19.2 °F | 37.1 °F | 1.97 in. |
| March | 28.7 °F | 49.2 °F | 2.63 in. |
| April | 39.0 °F | 62.7 °F | 3.86 in. |
| May | 50.6 °F | 73.7 °F | 4.56 in. |
| June | 60.4 °F | 82.4 °F | 4.49 in. |
| July | 63.6 °F | 85.2 °F | 4.44 in. |
| August | 61.3 °F | 83.5 °F | 3.72 in. |
| September | 53.0 °F | 78.6 °F | 2.92 in. |
| October | 41.9 °F | 65.9 °F | 3.3 in. |
| November | 31.3 °F | 50.3 °F | 2.84 in. |
| December | 21.6 °F | 37.5 °F | 2.1 in. |
| Annual | 40.6 °F | 61.6 °F | 39.19 in. |
| 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |