McCook Illinois Climate Data

Monthly Average Climate Data for McCook Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January17.7 °F31.7 °F2.18 in.
February20.4 °F35.5 °F2.08 in.
March29.7 °F46.7 °F2.38 in.
April40.1 °F59.7 °F3.97 in.
May50.9 °F70.9 °F4.81 in.
June61.1 °F80.9 °F4.4 in.
July66.1 °F85.4 °F4.23 in.
August64.7 °F83.3 °F4.16 in.
September56.9 °F76.8 °F3.23 in.
October44.5 °F63.5 °F3.45 in.
November33.3 °F49.4 °F2.53 in.
December23.3 °F37.3 °F2.33 in.
Annual42.4 °F60.1 °F39.75 in.

Climate Data for McCook Illinois

Average First Frost DateOct. 21 - Oct. 31
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 ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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