Johnsburg Illinois Climate Data

Monthly Average Climate Data for Johnsburg Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.6 °F29.1 °F1.8 in.
February16.4 °F33.0 °F1.84 in.
March25.9 °F44.2 °F2.22 in.
April36.3 °F57.2 °F3.78 in.
May47.0 °F68.7 °F4.58 in.
June57.2 °F78.5 °F4.87 in.
July61.9 °F82.6 °F3.83 in.
August60.3 °F80.9 °F3.84 in.
September52.4 °F74.2 °F3.62 in.
October40.9 °F61.1 °F3.13 in.
November30.2 °F46.8 °F2.41 in.
December19.8 °F34.4 °F2.02 in.
Annual38.5 °F57.6 °F37.94 in.

Climate Data for Johnsburg 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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