Shannon Illinois Climate Data

Monthly Average Climate Data for Shannon Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January11.9 °F28.3 °F1.59 in.
February15.4 °F32.6 °F1.73 in.
March25.8 °F45.0 °F2.23 in.
April36.3 °F58.7 °F3.76 in.
May48.2 °F70.3 °F4.53 in.
June58.1 °F79.5 °F5.23 in.
July61.4 °F82.3 °F4.58 in.
August59.3 °F81.0 °F3.85 in.
September50.8 °F74.7 °F3.69 in.
October39.7 °F61.8 °F2.83 in.
November28.7 °F46.4 °F2.24 in.
December18.2 °F33.6 °F1.94 in.
Annual37.8 °F57.9 °F38.2 in.

Climate Data for Shannon 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 ConditionsModerate Drought
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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