Princeville, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.7 °F (low) to 60.6 °F (high). Annual precipitation averages 38.2 Inches. 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 | 14.1 °F | 31.2 °F | 1.98 in. |
| February | 17.7 °F | 35.8 °F | 1.95 in. |
| March | 27.7 °F | 48.6 °F | 2.47 in. |
| April | 38.4 °F | 62.1 °F | 3.7 in. |
| May | 50.3 °F | 73.0 °F | 5.03 in. |
| June | 60.0 °F | 81.6 °F | 4.3 in. |
| July | 63.3 °F | 84.4 °F | 4.01 in. |
| August | 61.0 °F | 82.8 °F | 3.61 in. |
| September | 52.6 °F | 77.2 °F | 3.58 in. |
| October | 41.1 °F | 64.6 °F | 3.0 in. |
| November | 29.8 °F | 49.4 °F | 2.62 in. |
| December | 20.1 °F | 36.6 °F | 1.99 in. |
| Annual | 39.7 °F | 60.6 °F | 38.24 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 5b : -15°F to -10°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 |