Smithfield Illinois Climate Data

Monthly Average Climate Data for Smithfield Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January15.7 °F32.8 °F1.89 in.
February19.2 °F37.4 °F1.92 in.
March29.4 °F50.0 °F2.51 in.
April40.1 °F63.1 °F3.87 in.
May52.0 °F73.6 °F5.06 in.
June61.6 °F82.4 °F4.78 in.
July64.7 °F85.6 °F4.03 in.
August62.4 °F84.0 °F3.53 in.
September54.2 °F78.3 °F3.61 in.
October42.3 °F65.8 °F3.04 in.
November31.1 °F50.5 °F2.56 in.
December21.6 °F38.0 °F2.03 in.
Annual41.2 °F61.8 °F38.83 in.

Climate Data for Smithfield Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6a : -10°F to -5°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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