Caseyville Illinois Climate Data

Monthly Average Climate Data for Caseyville Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January23.4 °F40.0 °F2.75 in.
February26.8 °F45.3 °F2.42 in.
March35.6 °F55.5 °F3.55 in.
April46.3 °F67.5 °F4.91 in.
May57.1 °F76.5 °F5.26 in.
June66.0 °F85.3 °F5.06 in.
July69.8 °F88.7 °F4.47 in.
August67.8 °F87.4 °F3.83 in.
September59.4 °F80.9 °F3.4 in.
October47.9 °F69.4 °F3.26 in.
November36.7 °F55.4 °F3.72 in.
December28.0 °F44.4 °F2.8 in.
Annual47.1 °F66.4 °F45.43 in.

Climate Data for Caseyville Illinois

Average First Frost DateNov. 1 - Nov. 10
Average Last Frost DateApr. 1 - Apr. 10
Average Days With Frost75-100 Days
Plant Hardiness Zone - 2023Zone 7a : 0°F to 5°F
Plant Hardiness Zone - 2012Zone 6b : -5°F to 0°F
Current Drought ConditionsNormal
Köppen Climate ClassificationCfa - Humid Subtropical Climate
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