Cairo Illinois Climate Data

Monthly Average Climate Data for Cairo Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-2.8 °C6.3 °C100.33 mm
February-1.2 °C9.1 °C99.31 mm
March3.2 °C14.5 °C126.24 mm
April8.7 °C20.8 °C131.57 mm
May14.5 °C25.8 °C134.62 mm
June19.1 °C30.3 °C106.17 mm
July21 °C31.7 °C100.08 mm
August19.6 °C31 °C72.39 mm
September15 °C27.8 °C87.38 mm
October8.4 °C21.9 °C99.82 mm
November2.9 °C14.3 °C108.97 mm
December-0.9 °C8.2 °C109.98 mm
Annual9 °C20.1 °C1276.86 mm

Climate Data for Cairo Illinois

Average First Frost DateNov. 11 - Nov. 20
Average Last Frost DateApr. 11 - Apr. 20
Average Days With Frost50-75 Days
Plant Hardiness Zone - 2023Zone 7a : -17.8°C to -15°C
Plant Hardiness Zone - 2012Zone 7a : -17.8°C to -15°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationCfa - Humid Subtropical Climate
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