Vandalia Illinois Climate Data

Monthly Average Climate Data for Vandalia Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January21.4 °F37.7 °F2.97 in.
February25.0 °F42.8 °F2.47 in.
March33.8 °F53.5 °F3.34 in.
April44.1 °F65.7 °F4.62 in.
May54.9 °F75.3 °F4.89 in.
June63.7 °F84.4 °F4.63 in.
July66.9 °F87.6 °F4.23 in.
August64.5 °F86.3 °F3.3 in.
September56.1 °F80.1 °F3.22 in.
October44.3 °F68.2 °F3.28 in.
November34.5 °F53.9 °F3.76 in.
December26.2 °F42.3 °F2.74 in.
Annual44.6 °F64.8 °F43.45 in.

Climate Data for Vandalia Illinois

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 11 - Apr. 20
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6b : -5°F to 0°F
Plant Hardiness Zone - 2012Zone 6a : -10°F to -5°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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