Roanoke Illinois Climate Data

Monthly Average Climate Data for Roanoke Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-8.9 °C0.2 °C56.9 mm
February-7.1 °C2.9 °C50.04 mm
March-1.7 °C9.7 °C67.56 mm
April4.2 °C17.1 °C93.73 mm
May10.7 °C23.1 °C114.55 mm
June16.1 °C28 °C106.17 mm
July17.9 °C29.7 °C96.27 mm
August16.7 °C28.7 °C88.65 mm
September12.3 °C25.9 °C92.2 mm
October5.8 °C18.7 °C77.47 mm
November-0.3 °C10.2 °C66.55 mm
December-5.7 °C3.2 °C53.59 mm
Annual5 °C16.5 °C963.68 mm

Climate Data for Roanoke 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 5b : -26.1°C to -23.3°C
Plant Hardiness Zone - 2012Zone 5b : -26.1°C to -23.3°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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