Hull, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.9 °C (low) to 17.8 °C (high). Annual precipitation averages 986.5 Millimeters. Hull 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.8 °C | 2.3 °C | 49.02 mm |
| February | -4.8 °C | 5.3 °C | 51.05 mm |
| March | 0.3 °C | 11.3 °C | 67.82 mm |
| April | 6.4 °C | 18.1 °C | 104.14 mm |
| May | 12.3 °C | 23.9 °C | 123.19 mm |
| June | 17.6 °C | 28.9 °C | 114.3 mm |
| July | 19.7 °C | 31.1 °C | 101.6 mm |
| August | 18.7 °C | 30.4 °C | 88.9 mm |
| September | 14.1 °C | 26.2 °C | 87.63 mm |
| October | 7.8 °C | 19.6 °C | 77.22 mm |
| November | 1.4 °C | 11.8 °C | 68.58 mm |
| December | -4 °C | 5.1 °C | 53.09 mm |
| Annual | 6.9 °C | 17.8 °C | 986.54 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°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 |