Clear Lake Illinois Climate Data

Monthly Average Climate Data for Clear Lake Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January18.4 °F35.3 °F2.15 in.
February21.7 °F39.8 °F1.96 in.
March30.9 °F51.5 °F2.76 in.
April41.6 °F64.3 °F4.02 in.
May53.0 °F74.4 °F4.64 in.
June62.2 °F83.0 °F4.62 in.
July65.2 °F86.2 °F3.63 in.
August63.1 °F84.5 °F3.2 in.
September54.9 °F79.4 °F3.16 in.
October43.4 °F67.0 °F3.12 in.
November32.6 °F52.2 °F2.95 in.
December23.8 °F40.2 °F2.21 in.
Annual42.6 °F63.2 °F38.42 in.

Climate Data for Clear Lake Illinois

Average First Frost DateOct. 11 - Oct. 20
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 ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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