Janesville Wisconsin Climate Data

Monthly Average Climate Data for Janesville Wisconsin

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-11.1 °C-2.3 °C39.88 mm
February-9.4 °C-0.1 °C41.4 mm
March-3.6 °C6.7 °C52.58 mm
April2.3 °C14.1 °C92.96 mm
May8.8 °C20.7 °C107.19 mm
June14.3 °C26.2 °C135.38 mm
July16.6 °C28.2 °C96.27 mm
August15.6 °C27.3 °C108.2 mm
September10.9 °C23.6 °C92.2 mm
October4.4 °C16.2 °C74.17 mm
November-1.6 °C7.8 °C58.67 mm
December-7.4 °C0.8 °C47.75 mm
Annual3.3 °C14.1 °C946.65 mm

Climate Data for Janesville Wisconsin

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -26.1°C to -23.3°C
Plant Hardiness Zone - 2012Zone 5a : -28.9°C to -26.1°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
2023 plantmaps.com