Marion Illinois Climate Data

Monthly Average Climate Data for Marion Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-4.4 °C4.9 °C92.46 mm
February-2.7 °C7.8 °C78.74 mm
March1.9 °C13.3 °C115.57 mm
April7.6 °C19.7 °C138.68 mm
May13.3 °C24.6 °C130.3 mm
June18.1 °C29.3 °C113.79 mm
July20 °C31.1 °C102.36 mm
August18.6 °C30.6 °C79.25 mm
September14.1 °C27.4 °C80.77 mm
October7.6 °C21.1 °C89.92 mm
November2.1 °C13.5 °C111.51 mm
December-2.2 °C7.3 °C92.46 mm
Annual7.8 °C19.2 °C1225.81 mm

Climate Data for Marion Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost75-100 Days
Plant Hardiness Zone - 2023Zone 7a : -17.8°C to -15°C
Plant Hardiness Zone - 2012Zone 6b : -20.6°C to -17.8°C
Current Drought ConditionsNormal
Köppen Climate ClassificationCfa - Humid Subtropical Climate