Mundelein Illinois Climate Data

Monthly Average Climate Data for Mundelein Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January15.2 °F30.3 °F1.93 in.
February17.9 °F34.0 °F1.97 in.
March27.2 °F44.9 °F2.33 in.
April37.5 °F57.3 °F3.87 in.
May48.1 °F68.5 °F4.5 in.
June58.2 °F78.6 °F4.49 in.
July63.6 °F83.0 °F3.82 in.
August62.3 °F81.2 °F3.79 in.
September54.4 °F74.4 °F3.47 in.
October42.7 °F61.7 °F3.24 in.
November31.3 °F47.5 °F2.43 in.
December21.3 °F35.7 °F2.11 in.
Annual40 °F58.1 °F37.95 in.

Climate Data for Mundelein 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 ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation