Eureka Illinois Climate Data

Monthly Average Climate Data for Eureka Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January15.8 °F32.5 °F2.18 in.
February19.3 °F37.4 °F1.97 in.
March28.9 °F49.6 °F2.63 in.
April39.6 °F62.9 °F3.71 in.
May51.2 °F73.5 °F4.52 in.
June60.9 °F82.2 °F4.4 in.
July64.1 °F85.4 °F3.71 in.
August62.0 °F83.7 °F3.56 in.
September53.9 °F78.9 °F3.44 in.
October42.4 °F65.8 °F3.14 in.
November31.3 °F50.5 °F2.72 in.
December21.6 °F37.8 °F2.1 in.
Annual40.9 °F61.7 °F38.08 in.

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