Knollwood Illinois Climate Data

Monthly Average Climate Data for Knollwood Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.7 °F30.7 °F2.12 in.
February19.3 °F34.2 °F2.06 in.
March28.1 °F44.2 °F2.28 in.
April38.2 °F55.5 °F3.96 in.
May48.7 °F67.0 °F4.57 in.
June58.7 °F77.2 °F4.3 in.
July64.5 °F81.9 °F3.77 in.
August63.6 °F80.5 °F3.84 in.
September55.9 °F73.8 °F3.88 in.
October44.2 °F61.5 °F3.3 in.
November32.7 °F47.6 °F2.6 in.
December22.5 °F36.0 °F2.11 in.
Annual41.1 °F57.5 °F38.79 in.

Climate Data for Knollwood Illinois

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6a : -10°F to -5°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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