Vandalia Illinois Climate Data

Monthly Average Climate Data for Vandalia Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-5.9 °C3.2 °C75.44 mm
February-3.9 °C6 °C62.74 mm
March1 °C11.9 °C84.84 mm
April6.7 °C18.7 °C117.35 mm
May12.7 °C24.1 °C124.21 mm
June17.6 °C29.1 °C117.6 mm
July19.4 °C30.9 °C107.44 mm
August18.1 °C30.2 °C83.82 mm
September13.4 °C26.7 °C81.79 mm
October6.8 °C20.1 °C83.31 mm
November1.4 °C12.2 °C95.5 mm
December-3.2 °C5.7 °C69.6 mm
Annual7 °C18.2 °C1103.64 mm

Climate Data for Vandalia Illinois

Average First Frost DateOct. 21 - Oct. 31
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 ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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