Walnut Illinois Climate Data

Monthly Average Climate Data for Walnut Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.6 °F29.9 °F1.73 in.
February17.4 °F34.5 °F1.67 in.
March27.4 °F46.9 °F2.32 in.
April38.2 °F60.5 °F3.48 in.
May50.1 °F71.7 °F4.79 in.
June59.9 °F80.6 °F5.05 in.
July63.2 °F83.6 °F3.94 in.
August61.0 °F81.8 °F4.0 in.
September52.7 °F76.2 °F3.31 in.
October41.1 °F63.6 °F3.04 in.
November29.9 °F48.2 °F2.33 in.
December19.7 °F35.4 °F1.84 in.
Annual39.5 °F59.4 °F37.5 in.

Climate Data for Walnut Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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