Princeton Illinois Climate Data

Monthly Average Climate Data for Princeton Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January14.4 °F30.5 °F1.83 in.
February18.0 °F35.0 °F1.82 in.
March27.8 °F47.5 °F2.35 in.
April38.5 °F61.1 °F3.78 in.
May50.5 °F72.2 °F4.9 in.
June60.3 °F80.9 °F4.81 in.
July63.7 °F84.0 °F3.82 in.
August61.4 °F82.3 °F3.81 in.
September53.0 °F76.5 °F3.6 in.
October41.6 °F64.0 °F3.05 in.
November30.3 °F48.7 °F2.55 in.
December20.4 °F35.9 °F2.04 in.
Annual40 °F59.9 °F38.36 in.

Climate Data for Princeton Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
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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