Farmington Illinois Climate Data

Monthly Average Climate Data for Farmington Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January14.7 °F31.8 °F1.93 in.
February18.2 °F36.5 °F1.98 in.
March28.4 °F49.2 °F2.47 in.
April39.1 °F62.1 °F3.69 in.
May51.1 °F72.7 °F4.96 in.
June60.8 °F81.6 °F4.66 in.
July63.9 °F84.6 °F4.11 in.
August61.7 °F83.1 °F3.51 in.
September53.4 °F77.4 °F3.75 in.
October41.7 °F64.8 °F2.88 in.
November30.2 °F49.7 °F2.44 in.
December20.6 °F37.2 °F1.99 in.
Annual40.3 °F60.9 °F38.37 in.

Climate Data for Farmington 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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