Fairfield Illinois Climate Data

Monthly Average Climate Data for Fairfield Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January23.4 °F39.5 °F3.34 in.
February26.1 °F44.5 °F2.75 in.
March34.5 °F54.7 °F4.0 in.
April44.8 °F66.8 °F4.87 in.
May55.3 °F76.3 °F4.92 in.
June64.0 °F85.0 °F4.82 in.
July67.0 °F87.8 °F3.91 in.
August64.6 °F86.9 °F3.38 in.
September56.7 °F81.2 °F3.12 in.
October45.3 °F69.6 °F3.58 in.
November35.1 °F55.1 °F3.9 in.
December27.5 °F43.8 °F3.28 in.
Annual45.4 °F65.9 °F45.87 in.

Climate Data for Fairfield 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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