Wilmington Illinois Climate Data

Monthly Average Climate Data for Wilmington Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January15.8 °F31.8 °F2.14 in.
February18.7 °F35.9 °F1.91 in.
March28.3 °F47.9 °F2.38 in.
April38.7 °F60.9 °F3.75 in.
May50.0 °F72.0 °F4.71 in.
June60.0 °F81.5 °F4.61 in.
July63.5 °F84.7 °F4.2 in.
August61.6 °F82.9 °F3.91 in.
September53.7 °F77.6 °F3.35 in.
October42.0 °F64.3 °F3.15 in.
November31.4 °F49.4 °F2.51 in.
December21.7 °F37.0 °F2.12 in.
Annual40.5 °F60.5 °F38.74 in.

Climate Data for Wilmington 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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