Lerna Illinois Climate Data

Monthly Average Climate Data for Lerna Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January19.8 °F35.7 °F2.69 in.
February22.7 °F40.4 °F2.32 in.
March31.8 °F51.5 °F3.02 in.
April42.6 °F64.1 °F4.79 in.
May54.0 °F74.2 °F4.41 in.
June63.0 °F82.8 °F4.86 in.
July65.7 °F85.9 °F4.21 in.
August63.6 °F84.7 °F2.85 in.
September56.2 °F79.3 °F3.01 in.
October44.7 °F66.9 °F3.58 in.
November33.7 °F52.3 °F3.65 in.
December25.1 °F40.4 °F2.76 in.
Annual43.6 °F63.2 °F42.15 in.

Climate Data for Lerna 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 6a : -10°F to -5°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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