Sleepy Hollow Illinois Climate Data

Monthly Average Climate Data for Sleepy Hollow Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January14.6 °F30.3 °F1.95 in.
February17.3 °F34.3 °F1.85 in.
March26.9 °F45.9 °F2.26 in.
April37.2 °F58.6 °F3.82 in.
May48.2 °F70.1 °F5.18 in.
June58.2 °F80.0 °F4.77 in.
July63.1 °F84.0 °F4.01 in.
August61.5 °F82.0 °F4.15 in.
September53.5 °F75.3 °F3.56 in.
October41.7 °F62.2 °F3.31 in.
November30.6 °F47.7 °F2.55 in.
December20.6 °F35.6 °F2.17 in.
Annual39.5 °F58.8 °F39.58 in.

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