Campton Hills, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4 °C (low) to 14.9 °C (high). Annual precipitation averages 985 Millimeters. Campton Hills is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.9 °C | -1.1 °C | 48.77 mm |
| February | -8.3 °C | 1.2 °C | 47.24 mm |
| March | -3 °C | 7.8 °C | 59.18 mm |
| April | 2.8 °C | 15.1 °C | 94.49 mm |
| May | 9.1 °C | 21.4 °C | 127 mm |
| June | 14.7 °C | 26.8 °C | 112.01 mm |
| July | 17.1 °C | 28.7 °C | 98.55 mm |
| August | 16.1 °C | 27.7 °C | 100.58 mm |
| September | 11.6 °C | 24.2 °C | 90.17 mm |
| October | 5.1 °C | 16.9 °C | 85.85 mm |
| November | -1.1 °C | 8.7 °C | 65.02 mm |
| December | -6.6 °C | 1.8 °C | 56.13 mm |
| Annual | 4 °C | 14.9 °C | 984.99 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 |