Millbrook Illinois Climate Data

Monthly Average Climate Data for Millbrook Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-9.2 °C-0.6 °C46.74 mm
February-7.6 °C1.6 °C45.21 mm
March-2.2 °C8.3 °C59.69 mm
April3.7 °C15.7 °C96.01 mm
May9.9 °C21.9 °C118.87 mm
June15.5 °C27.1 °C118.11 mm
July17.5 °C28.9 °C99.82 mm
August16.5 °C27.8 °C98.04 mm
September12.1 °C24.8 °C86.87 mm
October5.4 °C17.6 °C83.31 mm
November-0.4 °C9.4 °C63.75 mm
December-6 °C2.3 °C53.59 mm
Annual4.6 °C15.4 °C970.01 mm

Climate Data for Millbrook Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -26.1°C to -23.3°C
Plant Hardiness Zone - 2012Zone 5b : -26.1°C to -23.3°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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