Winnebago Illinois Climate Data

Monthly Average Climate Data for Winnebago Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January12.1 °F28.0 °F1.6 in.
February15.5 °F32.2 °F1.66 in.
March25.8 °F44.5 °F2.16 in.
April36.5 °F58.1 °F3.71 in.
May48.3 °F69.6 °F4.48 in.
June58.4 °F79.0 °F5.35 in.
July61.8 °F82.1 °F4.11 in.
August60.0 °F80.6 °F4.13 in.
September51.5 °F74.4 °F3.47 in.
October40.0 °F61.5 °F2.89 in.
November29.0 °F46.3 °F2.19 in.
December18.6 °F33.6 °F1.94 in.
Annual38.1 °F57.5 °F37.69 in.

Climate Data for Winnebago 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 5a : -20°F to -15°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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