Janesville, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.5 °C (low) to 17.6 °C (high). Annual precipitation averages 1080.5 Millimeters. Janesville is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.6 °C | 2.3 °C | 69.34 mm |
| February | -4.9 °C | 4.9 °C | 60.45 mm |
| March | 0.1 °C | 11.1 °C | 76.96 mm |
| April | 6.1 °C | 18.2 °C | 119.89 mm |
| May | 12.3 °C | 23.7 °C | 114.3 mm |
| June | 17.2 °C | 28.4 °C | 124.21 mm |
| July | 18.8 °C | 30.2 °C | 109.22 mm |
| August | 17.6 °C | 29.6 °C | 76.71 mm |
| September | 13.3 °C | 26.5 °C | 78.99 mm |
| October | 7 °C | 19.7 °C | 89.41 mm |
| November | 1.1 °C | 11.6 °C | 92.96 mm |
| December | -3.6 °C | 4.9 °C | 68.07 mm |
| Annual | 6.5 °C | 17.6 °C | 1080.51 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |