Naperville Illinois Climate Data

Monthly Average Climate Data for Naperville Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January15.5 °F31.4 °F2.07 in.
February18.1 °F35.3 °F2.02 in.
March27.7 °F47.2 °F2.39 in.
April38.1 °F60.1 °F3.95 in.
May49.1 °F71.3 °F4.9 in.
June59.2 °F81.0 °F4.58 in.
July63.6 °F84.8 °F3.94 in.
August62.0 °F82.9 °F4.1 in.
September54.1 °F76.6 °F3.28 in.
October42.0 °F63.5 °F3.59 in.
November30.9 °F48.7 °F2.58 in.
December21.3 °F36.5 °F2.23 in.
Annual40.1 °F59.9 °F39.63 in.

Climate Data for Naperville 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 ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation