Time Illinois Climate Data

Monthly Average Climate Data for Time Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January18.6 °F35.5 °F2.04 in.
February22.0 °F40.6 °F1.97 in.
March31.2 °F51.8 °F2.78 in.
April41.8 °F64.3 °F4.12 in.
May53.1 °F73.9 °F4.69 in.
June62.6 °F82.6 °F4.74 in.
July65.7 °F86.0 °F4.18 in.
August63.5 °F85.1 °F3.43 in.
September54.8 °F79.2 °F3.53 in.
October43.4 °F66.6 °F2.89 in.
November33.1 °F52.6 °F2.89 in.
December23.7 °F40.3 °F2.13 in.
Annual42.8 °F63.2 °F39.39 in.

Climate Data for Time 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 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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