Dayton Illinois Climate Data

Monthly Average Climate Data for Dayton Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January15.5 °F31.4 °F2.0 in.
February18.8 °F35.8 °F1.92 in.
March28.3 °F48.0 °F2.52 in.
April38.9 °F61.2 °F3.54 in.
May50.3 °F72.3 °F4.72 in.
June60.1 °F81.2 °F4.65 in.
July63.8 °F84.2 °F3.9 in.
August61.8 °F82.3 °F3.93 in.
September54.0 °F77.0 °F3.36 in.
October42.3 °F64.4 °F3.13 in.
November31.4 °F49.5 °F2.7 in.
December21.3 °F36.6 °F2.12 in.
Annual40.5 °F60.3 °F38.49 in.

Climate Data for Dayton Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
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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