Flanagan Illinois Climate Data

Monthly Average Climate Data for Flanagan Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.1 °F32.3 °F2.07 in.
February19.5 °F36.9 °F1.83 in.
March29.0 °F49.2 °F2.58 in.
April39.6 °F62.6 °F3.61 in.
May51.3 °F73.6 °F4.51 in.
June60.9 °F82.3 °F4.09 in.
July64.3 °F85.1 °F3.89 in.
August62.1 °F83.4 °F3.51 in.
September54.1 °F78.2 °F3.36 in.
October42.6 °F65.5 °F3.16 in.
November31.7 °F50.2 °F2.64 in.
December21.9 °F37.5 °F2.05 in.
Annual41.1 °F61.4 °F37.3 in.

Climate Data for Flanagan 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 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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