Princeville, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.3 °C (low) to 15.9 °C (high). Annual precipitation averages 971.3 Millimeters. Princeville is located in USDA Plant Hardiness Zone 5b. 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 | -9.9 °C | -0.4 °C | 50.29 mm |
| February | -7.9 °C | 2.1 °C | 49.53 mm |
| March | -2.4 °C | 9.2 °C | 62.74 mm |
| April | 3.6 °C | 16.7 °C | 93.98 mm |
| May | 10.2 °C | 22.8 °C | 127.76 mm |
| June | 15.6 °C | 27.6 °C | 109.22 mm |
| July | 17.4 °C | 29.1 °C | 101.85 mm |
| August | 16.1 °C | 28.2 °C | 91.69 mm |
| September | 11.4 °C | 25.1 °C | 90.93 mm |
| October | 5.1 °C | 18.1 °C | 76.2 mm |
| November | -1.2 °C | 9.7 °C | 66.55 mm |
| December | -6.6 °C | 2.6 °C | 50.55 mm |
| Annual | 4.3 °C | 15.9 °C | 971.29 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 5b : -26.1°C to -23.3°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 |