Boulder Hill Illinois Climate Data

Monthly Average Climate Data for Boulder Hill Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January15.2 °F31.2 °F1.93 in.
February18.0 °F35.2 °F1.9 in.
March27.7 °F47.2 °F2.39 in.
April38.2 °F60.1 °F3.91 in.
May49.3 °F71.2 °F4.8 in.
June59.3 °F80.8 °F4.5 in.
July63.4 °F84.4 °F3.9 in.
August61.7 °F82.5 °F3.92 in.
September54.0 °F76.4 °F3.3 in.
October41.8 °F63.4 °F3.49 in.
November31.1 °F48.8 °F2.55 in.
December21.1 °F36.3 °F2.17 in.
Annual40.1 °F59.8 °F38.76 in.

Climate Data for Boulder Hill 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
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