Raritan Illinois Climate Data

Monthly Average Climate Data for Raritan Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-9.3 °C0 °C42.67 mm
February-7.3 °C2.6 °C47.5 mm
March-1.7 °C9.7 °C62.48 mm
April4.3 °C17 °C97.28 mm
May10.9 °C22.8 °C130.56 mm
June16.3 °C27.8 °C122.17 mm
July18.2 °C29.5 °C102.11 mm
August16.9 °C28.6 °C92.46 mm
September12.3 °C25.5 °C94.23 mm
October5.8 °C18.5 °C76.2 mm
November-0.7 °C9.9 °C64.01 mm
December-6.1 °C2.9 °C49.02 mm
Annual5 °C16.2 °C980.69 mm

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 : -26.1°C to -23.3°C
Plant Hardiness Zone - 2012Zone 5b : -26.1°C to -23.3°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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