Hillsboro Illinois Climate Data

Monthly Average Climate Data for Hillsboro Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January20.6 °F36.4 °F2.79 in.
February24.4 °F41.8 °F2.24 in.
March33.3 °F52.8 °F3.07 in.
April43.6 °F65.6 °F4.96 in.
May54.4 °F75.5 °F5.18 in.
June63.3 °F84.2 °F4.36 in.
July66.5 °F87.2 °F3.82 in.
August64.2 °F86.0 °F3.27 in.
September56.0 °F80.3 °F2.96 in.
October44.5 °F68.2 °F3.35 in.
November34.6 °F53.1 °F3.48 in.
December25.7 °F41.3 °F2.57 in.
Annual44.3 °F64.4 °F42.05 in.

Climate Data for Hillsboro Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost75-100 Days
Plant Hardiness Zone - 2023Zone 6b : -5°F to 0°F
Plant Hardiness Zone - 2012Zone 6a : -10°F to -5°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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