Fox Lake, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.6 °C (low) to 14.1 °C (high). Annual precipitation averages 964.2 Millimeters. Fox Lake 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 | -10.3 °C | -1.8 °C | 46.99 mm |
| February | -8.7 °C | 0.3 °C | 47.5 mm |
| March | -3.5 °C | 6.6 °C | 56.64 mm |
| April | 2.4 °C | 13.9 °C | 97.28 mm |
| May | 8.3 °C | 20.3 °C | 114.55 mm |
| June | 14 °C | 25.8 °C | 121.92 mm |
| July | 16.7 °C | 28.1 °C | 96.77 mm |
| August | 15.8 °C | 27.2 °C | 97.03 mm |
| September | 11.6 °C | 23.4 °C | 92.2 mm |
| October | 5 °C | 16.2 °C | 79.76 mm |
| November | -1 °C | 8.1 °C | 60.96 mm |
| December | -6.8 °C | 1.3 °C | 52.58 mm |
| Annual | 3.6 °C | 14.1 °C | 964.18 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 |