Walnut Illinois Climate Data

Monthly Average Climate Data for Walnut Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-10.2 °C-1.2 °C43.94 mm
February-8.1 °C1.4 °C42.42 mm
March-2.6 °C8.3 °C58.93 mm
April3.4 °C15.8 °C88.39 mm
May10.1 °C22.1 °C121.67 mm
June15.5 °C27 °C128.27 mm
July17.3 °C28.7 °C100.08 mm
August16.1 °C27.7 °C101.6 mm
September11.5 °C24.6 °C84.07 mm
October5.1 °C17.6 °C77.22 mm
November-1.2 °C9 °C59.18 mm
December-6.8 °C1.9 °C46.74 mm
Annual4.2 °C15.2 °C952.51 mm

Climate Data for Walnut Illinois

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 5b : -26.1°C to -23.3°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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