Lerna Illinois Climate Data

Monthly Average Climate Data for Lerna Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-6.8 °C2.1 °C68.33 mm
February-5.2 °C4.7 °C58.93 mm
March-0.1 °C10.8 °C76.71 mm
April5.9 °C17.8 °C121.67 mm
May12.2 °C23.4 °C112.01 mm
June17.2 °C28.2 °C123.44 mm
July18.7 °C29.9 °C106.93 mm
August17.6 °C29.3 °C72.39 mm
September13.4 °C26.3 °C76.45 mm
October7.1 °C19.4 °C90.93 mm
November0.9 °C11.3 °C92.71 mm
December-3.8 °C4.7 °C70.1 mm
Annual6.4 °C17.3 °C1070.6 mm

Climate Data for Lerna 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 6a : -23.3°C to -20.6°C
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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