Leland Illinois Climate Data

Monthly Average Climate Data for Leland Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.9 °F29.7 °F1.78 in.
February17.5 °F34.2 °F1.76 in.
March27.3 °F46.5 °F2.32 in.
April37.8 °F60.1 °F3.63 in.
May49.5 °F71.4 °F4.74 in.
June59.4 °F80.5 °F4.63 in.
July62.8 °F83.4 °F4.02 in.
August60.7 °F81.5 °F3.86 in.
September52.5 °F76.1 °F3.46 in.
October40.9 °F63.3 °F3.14 in.
November30.2 °F48.2 °F2.5 in.
December20.0 °F35.2 °F2.02 in.
Annual39.4 °F59.2 °F37.86 in.

Climate Data for Leland 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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