Port Byron Illinois Climate Data

Monthly Average Climate Data for Port Byron Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January14.1 °F30.1 °F1.54 in.
February17.7 °F34.6 °F1.75 in.
March28.4 °F47.4 °F2.51 in.
April39.5 °F60.8 °F3.71 in.
May51.3 °F72.1 °F4.76 in.
June61.4 °F81.4 °F4.95 in.
July65.0 °F84.5 °F4.48 in.
August62.8 °F82.6 °F4.04 in.
September54.6 °F76.6 °F3.49 in.
October42.7 °F63.6 °F2.82 in.
November30.8 °F48.6 °F2.25 in.
December20.3 °F35.6 °F2.06 in.
Annual40.7 °F59.8 °F38.36 in.

Climate Data for Port Byron Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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