Pearl, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.3 °F (low) to 64.2 °F (high). Annual precipitation averages 39.8 Inches. Pearl is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.3 °F | 36.6 °F | 2.15 in. |
| February | 22.8 °F | 41.8 °F | 2.02 in. |
| March | 31.7 °F | 53.0 °F | 2.88 in. |
| April | 42.2 °F | 65.4 °F | 4.18 in. |
| May | 53.6 °F | 74.9 °F | 4.75 in. |
| June | 62.7 °F | 83.7 °F | 4.67 in. |
| July | 66.3 °F | 87.0 °F | 3.99 in. |
| August | 63.9 °F | 85.9 °F | 3.42 in. |
| September | 55.3 °F | 79.8 °F | 3.43 in. |
| October | 44.0 °F | 67.7 °F | 3.01 in. |
| November | 33.4 °F | 53.5 °F | 3.01 in. |
| December | 24.3 °F | 41.4 °F | 2.26 in. |
| Annual | 43.3 °F | 64.2 °F | 39.77 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |