Galena Illinois Climate Data

Monthly Average Climate Data for Galena Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January11.2 °F28.2 °F1.31 in.
February14.6 °F32.6 °F1.55 in.
March25.8 °F45.4 °F2.14 in.
April36.7 °F58.8 °F3.94 in.
May48.2 °F70.6 °F4.33 in.
June58.5 °F80.2 °F5.9 in.
July62.2 °F83.3 °F4.64 in.
August60.1 °F81.5 °F4.08 in.
September51.6 °F74.8 °F3.8 in.
October39.9 °F61.8 °F3.06 in.
November28.3 °F46.3 °F2.31 in.
December17.6 °F33.7 °F1.8 in.
Annual37.9 °F58.1 °F38.86 in.

Climate Data for Galena 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 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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