Plano Illinois Climate Data

Monthly Average Climate Data for Plano Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January14.8 °F30.3 °F1.88 in.
February18.0 °F34.5 °F1.83 in.
March27.8 °F46.7 °F2.36 in.
April38.5 °F59.8 °F3.84 in.
May49.8 °F71.2 °F4.75 in.
June59.8 °F80.7 °F4.58 in.
July63.4 °F83.9 °F3.9 in.
August61.5 °F82.0 °F3.86 in.
September53.4 °F76.3 °F3.42 in.
October41.5 °F63.3 °F3.3 in.
November30.9 °F48.5 °F2.51 in.
December20.8 °F35.8 °F2.12 in.
Annual40 °F59.4 °F38.35 in.

Climate Data for Plano 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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