Huntley, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.9 °C (low) to 14.8 °C (high). Annual precipitation averages 988.1 Millimeters. Huntley 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 | -9.8 °C | -1.1 °C | 47.24 mm |
| February | -8.3 °C | 1.3 °C | 46.99 mm |
| March | -3 °C | 7.8 °C | 56.39 mm |
| April | 2.6 °C | 14.8 °C | 94.74 mm |
| May | 8.8 °C | 21.2 °C | 126.24 mm |
| June | 14.5 °C | 26.6 °C | 124.46 mm |
| July | 16.8 °C | 28.7 °C | 102.62 mm |
| August | 15.8 °C | 27.6 °C | 102.36 mm |
| September | 11.6 °C | 23.8 °C | 90.42 mm |
| October | 5.3 °C | 16.6 °C | 80.52 mm |
| November | -0.9 °C | 8.6 °C | 62.99 mm |
| December | -6.7 °C | 1.6 °C | 53.09 mm |
| Annual | 3.9 °C | 14.8 °C | 988.06 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 |