Annawan Illinois Climate Data

Monthly Average Climate Data for Annawan Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January14.3 °F30.3 °F1.77 in.
February17.7 °F34.8 °F1.89 in.
March28.1 °F47.6 °F2.44 in.
April38.9 °F61.1 °F3.79 in.
May50.7 °F72.3 °F4.93 in.
June60.6 °F81.3 °F4.84 in.
July64.0 °F84.3 °F3.99 in.
August61.8 °F82.7 °F3.92 in.
September53.4 °F76.8 °F3.58 in.
October41.9 °F64.1 °F2.94 in.
November30.4 °F48.7 °F2.43 in.
December20.2 °F35.8 °F2.04 in.
Annual40.2 °F60 °F38.56 in.

Climate Data for Annawan 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 ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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