Hillview, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.4 °C (low) to 17.9 °C (high). Annual precipitation averages 1015.3 Millimeters. Hillview is located in USDA Plant Hardiness Zone 6a. 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 | -6.9 °C | 2.5 °C | 54.86 mm |
| February | -5.1 °C | 5.4 °C | 51.82 mm |
| March | -0.1 °C | 11.6 °C | 74.17 mm |
| April | 5.8 °C | 18.5 °C | 107.7 mm |
| May | 12.1 °C | 23.8 °C | 122.43 mm |
| June | 17.1 °C | 28.7 °C | 119.89 mm |
| July | 19.2 °C | 30.5 °C | 100.08 mm |
| August | 17.8 °C | 29.9 °C | 86.36 mm |
| September | 13.1 °C | 26.6 °C | 84.58 mm |
| October | 6.7 °C | 19.8 °C | 76.71 mm |
| November | 0.8 °C | 11.9 °C | 77.98 mm |
| December | -4.2 °C | 5.2 °C | 58.67 mm |
| Annual | 6.4 °C | 17.9 °C | 1015.25 mm |
| 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 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |