Dewey Illinois Climate Data

Monthly Average Climate Data for Dewey Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January17.1 °F33.2 °F2.34 in.
February20.2 °F37.8 °F2.1 in.
March29.4 °F49.5 °F2.77 in.
April40.0 °F63.1 °F4.05 in.
May52.0 °F74.1 °F4.5 in.
June61.2 °F82.6 °F4.72 in.
July64.0 °F85.1 °F4.4 in.
August61.5 °F83.6 °F3.79 in.
September54.2 °F78.9 °F3.34 in.
October42.3 °F66.0 °F3.33 in.
November31.8 °F50.8 °F3.13 in.
December22.7 °F38.0 °F2.39 in.
Annual41.4 °F61.9 °F40.86 in.

Climate Data for Dewey Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6a : -10°F to -5°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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