Raritan Illinois Climate Data

Monthly Average Climate Data for Raritan Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January15.2 °F32.0 °F1.68 in.
February18.8 °F36.7 °F1.87 in.
March29.0 °F49.5 °F2.46 in.
April39.8 °F62.6 °F3.83 in.
May51.7 °F73.1 °F5.14 in.
June61.4 °F82.1 °F4.81 in.
July64.7 °F85.1 °F4.02 in.
August62.4 °F83.5 °F3.64 in.
September54.1 °F77.9 °F3.71 in.
October42.4 °F65.3 °F3.0 in.
November30.8 °F49.9 °F2.52 in.
December21.0 °F37.3 °F1.93 in.
Annual40.9 °F61.3 °F38.61 in.

Climate Data for Raritan Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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