Maryville Illinois Climate Data

Monthly Average Climate Data for Maryville Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-4.6 °C4.3 °C68.58 mm
February-2.8 °C7.4 °C61.47 mm
March2.2 °C13.1 °C88.65 mm
April8.1 °C19.5 °C125.73 mm
May14.2 °C24.6 °C133.1 mm
June19.1 °C29.4 °C121.92 mm
July21.2 °C31.1 °C109.98 mm
August20.1 °C30.6 °C98.04 mm
September15.4 °C27 °C82.04 mm
October9.3 °C20.6 °C83.57 mm
November2.7 °C12.7 °C92.46 mm
December-1.9 °C6.8 °C69.85 mm
Annual8.6 °C18.9 °C1135.39 mm

Climate Data for Maryville Illinois

Average First Frost DateNov. 1 - Nov. 10
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 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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