Illiopolis Illinois Climate Data

Monthly Average Climate Data for Illiopolis Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January18.7 °F35.2 °F2.19 in.
February21.8 °F39.9 °F2.0 in.
March31.0 °F51.5 °F2.73 in.
April41.8 °F64.4 °F4.09 in.
May53.1 °F74.5 °F4.55 in.
June62.3 °F83.2 °F4.6 in.
July65.2 °F86.1 °F3.87 in.
August63.1 °F84.6 °F3.31 in.
September54.8 °F79.5 °F3.12 in.
October43.3 °F67.1 °F3.27 in.
November32.7 °F52.0 °F3.01 in.
December24.1 °F40.1 °F2.27 in.
Annual42.7 °F63.2 °F39.01 in.

Climate Data for Illiopolis 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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