Olney Illinois Climate Data

Monthly Average Climate Data for Olney Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-5.3 °C3.6 °C86.87 mm
February-3.7 °C6.3 °C64.52 mm
March1.1 °C12.2 °C101.09 mm
April6.8 °C18.9 °C125.73 mm
May12.8 °C24.3 °C134.11 mm
June17.7 °C29.1 °C124.46 mm
July19.3 °C30.7 °C116.84 mm
August17.9 °C30.2 °C71.37 mm
September13.7 °C27.3 °C84.33 mm
October7.3 °C20.6 °C92.96 mm
November1.6 °C12.5 °C102.62 mm
December-2.8 °C6.1 °C86.36 mm
Annual7.2 °C18.5 °C1191.26 mm

Climate Data for Olney 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 6b : -20.6°C to -17.8°C
Plant Hardiness Zone - 2012Zone 6a : -23.3°C to -20.6°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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