Detroit Illinois Climate Data

Monthly Average Climate Data for Detroit Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January18.7 °F35.6 °F2.06 in.
February22.1 °F40.7 °F1.96 in.
March31.3 °F52.0 °F2.79 in.
April41.9 °F64.5 °F4.1 in.
May53.3 °F74.1 °F4.7 in.
June62.6 °F82.7 °F4.79 in.
July65.8 °F86.2 °F4.2 in.
August63.6 °F85.2 °F3.41 in.
September55.0 °F79.3 °F3.52 in.
October43.6 °F66.8 °F2.92 in.
November33.2 °F52.7 °F2.9 in.
December23.9 °F40.4 °F2.15 in.
Annual42.9 °F63.4 °F39.5 in.

Climate Data for Detroit Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6a : -10°F to -5°F
Plant Hardiness Zone - 2012Zone 6a : -10°F to -5°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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