Mount Carmel, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.5 °C (low) to 19.1 °C (high). Annual precipitation averages 1196.1 Millimeters. Mount Carmel 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5 °C | 4.3 °C | 90.93 mm |
| February | -3.3 °C | 7.2 °C | 72.39 mm |
| March | 1.3 °C | 12.8 °C | 104.14 mm |
| April | 7.1 °C | 19.7 °C | 125.22 mm |
| May | 13 °C | 25 °C | 133.1 mm |
| June | 17.9 °C | 29.7 °C | 118.11 mm |
| July | 19.5 °C | 31.3 °C | 109.22 mm |
| August | 18.4 °C | 30.7 °C | 80.01 mm |
| September | 14.1 °C | 27.7 °C | 88.9 mm |
| October | 7.6 °C | 21.1 °C | 85.85 mm |
| November | 1.7 °C | 13 °C | 99.06 mm |
| December | -2.8 °C | 6.7 °C | 89.15 mm |
| Annual | 7.5 °C | 19.1 °C | 1196.08 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |