Harvard Illinois Climate Data

Monthly Average Climate Data for Harvard Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-10.5 °C-1.8 °C43.18 mm
February-9 °C0.4 °C44.2 mm
March-3.7 °C6.9 °C56.9 mm
April2 °C14.2 °C93.73 mm
May8.7 °C20.5 °C113.03 mm
June13.9 °C25.8 °C131.32 mm
July16.3 °C27.8 °C98.81 mm
August15.3 °C27 °C102.36 mm
September10.9 °C23.4 °C92.71 mm
October4.6 °C16.2 °C73.66 mm
November-1.4 °C8 °C60.96 mm
December-7.3 °C0.9 °C50.55 mm
Annual3.3 °C14.1 °C961.41 mm

Climate Data for Harvard Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 21 - May 31
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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