Morton Illinois Climate Data

Monthly Average Climate Data for Morton Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.1 °F32.8 °F2.22 in.
February19.5 °F37.7 °F2.03 in.
March29.1 °F49.8 °F2.59 in.
April40.0 °F62.8 °F3.88 in.
May51.5 °F73.4 °F4.76 in.
June61.2 °F82.3 °F4.28 in.
July64.4 °F85.4 °F4.04 in.
August62.3 °F83.8 °F3.37 in.
September54.3 °F78.7 °F3.31 in.
October42.6 °F65.6 °F3.2 in.
November31.3 °F50.7 °F2.89 in.
December21.8 °F38.0 °F2.14 in.
Annual41.2 °F61.8 °F38.71 in.

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 : -10°F to -5°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation