Andover Illinois Climate Data

Monthly Average Climate Data for Andover Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.9 °F30.1 °F1.65 in.
February17.3 °F34.6 °F1.87 in.
March27.8 °F47.9 °F2.4 in.
April38.8 °F61.2 °F3.79 in.
May50.8 °F72.1 °F4.93 in.
June60.7 °F80.9 °F4.77 in.
July64.3 °F83.9 °F4.04 in.
August62.1 °F82.2 °F3.83 in.
September53.8 °F76.4 °F3.64 in.
October42.0 °F63.7 °F2.89 in.
November30.2 °F48.5 °F2.38 in.
December19.9 °F35.6 °F2.04 in.
Annual40.1 °F59.8 °F38.23 in.

Climate Data for Andover Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
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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