Harvard Illinois Climate Data

Monthly Average Climate Data for Harvard Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.1 °F28.7 °F1.7 in.
February15.8 °F32.7 °F1.74 in.
March25.4 °F44.5 °F2.24 in.
April35.6 °F57.5 °F3.69 in.
May47.6 °F68.9 °F4.45 in.
June57.0 °F78.4 °F5.17 in.
July61.3 °F82.1 °F3.89 in.
August59.5 °F80.6 °F4.03 in.
September51.7 °F74.1 °F3.65 in.
October40.2 °F61.1 °F2.9 in.
November29.5 °F46.4 °F2.4 in.
December18.9 °F33.7 °F1.99 in.
Annual38 °F57.4 °F37.85 in.

Climate Data for Harvard Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
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 ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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