McLean Illinois Climate Data

Monthly Average Climate Data for McLean Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-8.4 °C0.8 °C56.9 mm
February-6.4 °C3.5 °C50.29 mm
March-1.3 °C10.1 °C68.07 mm
April4.7 °C17.4 °C97.79 mm
May11.2 °C23.3 °C113.28 mm
June16.4 °C28.2 °C112.52 mm
July18.1 °C29.8 °C103.12 mm
August16.9 °C28.8 °C92.2 mm
September12.5 °C26.1 °C84.07 mm
October6.1 °C18.9 °C84.84 mm
November-0.1 °C10.6 °C72.14 mm
December-5.2 °C3.6 °C59.18 mm
Annual5.4 °C16.8 °C994.4 mm

Climate Data for McLean Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6a : -23.3°C to -20.6°C
Plant Hardiness Zone - 2012Zone 5b : -26.1°C to -23.3°C
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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