Morton Illinois Climate Data

Monthly Average Climate Data for Morton Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-8.8 °C0.4 °C56.39 mm
February-6.9 °C3.2 °C51.56 mm
March-1.6 °C9.9 °C65.79 mm
April4.4 °C17.1 °C98.55 mm
May10.8 °C23 °C120.9 mm
June16.2 °C27.9 °C108.71 mm
July18 °C29.7 °C102.62 mm
August16.8 °C28.8 °C85.6 mm
September12.4 °C25.9 °C84.07 mm
October5.9 °C18.7 °C81.28 mm
November-0.4 °C10.4 °C73.41 mm
December-5.7 °C3.3 °C54.36 mm
Annual5.1 °C16.5 °C983.24 mm

Climate Data for Morton Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6a : -23.3°C to -20.6°C
Plant Hardiness Zone - 2012Zone 5b : -26.1°C to -23.3°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation