Marine Illinois Climate Data

Monthly Average Climate Data for Marine Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-5.2 °C3.9 °C69.09 mm
February-3.4 °C6.8 °C60.45 mm
March1.6 °C12.6 °C86.11 mm
April7.4 °C19.2 °C125.22 mm
May13.5 °C24.3 °C129.54 mm
June18.4 °C29.2 °C120.14 mm
July20.4 °C31.1 °C107.95 mm
August19.3 °C30.4 °C93.47 mm
September14.6 °C26.9 °C83.57 mm
October8.2 °C20.5 °C84.33 mm
November2.1 °C12.6 °C93.73 mm
December-2.7 °C6.4 °C70.61 mm
Annual7.9 °C18.7 °C1124.21 mm

Climate Data for Marine Illinois

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost75-100 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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