Rentchler, Illinois has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.1 °C (low) to 19 °C (high). Annual precipitation averages 1138.9 Millimeters. Rentchler is located in USDA Plant Hardiness Zone 7a. 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 | -4.9 °C | 4.3 °C | 72.14 mm |
| February | -3.1 °C | 7.3 °C | 62.23 mm |
| March | 1.7 °C | 13 °C | 90.17 mm |
| April | 7.7 °C | 19.6 °C | 128.02 mm |
| May | 13.7 °C | 24.6 °C | 132.84 mm |
| June | 18.7 °C | 29.6 °C | 126.24 mm |
| July | 20.7 °C | 31.4 °C | 102.11 mm |
| August | 19.6 °C | 30.7 °C | 87.12 mm |
| September | 14.8 °C | 27.2 °C | 87.63 mm |
| October | 8.4 °C | 20.8 °C | 80.77 mm |
| November | 2.2 °C | 12.9 °C | 96.01 mm |
| December | -2.5 °C | 6.8 °C | 73.66 mm |
| Annual | 8.1 °C | 19 °C | 1138.94 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |