Hanover Illinois Climate Data

Monthly Average Climate Data for Hanover Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January11.6 °F28.6 °F1.37 in.
February15.0 °F33.0 °F1.63 in.
March26.1 °F45.8 °F2.2 in.
April36.9 °F59.1 °F3.79 in.
May48.6 °F70.8 °F4.34 in.
June58.8 °F80.6 °F5.72 in.
July62.4 °F83.7 °F4.53 in.
August60.2 °F81.8 °F3.88 in.
September51.7 °F75.4 °F3.69 in.
October40.2 °F62.4 °F2.95 in.
November28.7 °F46.9 °F2.27 in.
December18.0 °F34.1 °F1.77 in.
Annual38.2 °F58.5 °F38.14 in.

Climate Data for Hanover Illinois

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