Big Rock Illinois Climate Data

Monthly Average Climate Data for Big Rock Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January14.1 °F29.9 °F1.87 in.
February17.2 °F34.0 °F1.84 in.
March27.1 °F46.2 °F2.33 in.
April37.7 °F59.3 °F3.73 in.
May49.2 °F70.7 °F4.78 in.
June59.1 °F80.4 °F4.42 in.
July62.9 °F83.6 °F3.78 in.
August60.8 °F81.6 °F3.82 in.
September52.7 °F75.8 °F3.32 in.
October40.9 °F62.9 °F3.28 in.
November30.2 °F48.1 °F2.5 in.
December20.1 °F35.3 °F2.13 in.
Annual39.3 °F59 °F37.8 in.

Climate Data for Big Rock 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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