Fairmont Illinois Climate Data

Monthly Average Climate Data for Fairmont Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.4 °F31.7 °F2.11 in.
February19.1 °F35.6 °F1.96 in.
March28.7 °F47.4 °F2.49 in.
April39.2 °F60.5 °F3.92 in.
May49.9 °F71.4 °F4.82 in.
June60.0 °F80.9 °F4.68 in.
July64.1 °F84.5 °F4.35 in.
August62.7 °F82.7 °F4.2 in.
September55.1 °F76.9 °F3.35 in.
October42.9 °F63.7 °F3.41 in.
November32.0 °F49.2 °F2.46 in.
December22.1 °F36.8 °F2.16 in.
Annual41 °F60.1 °F39.91 in.

Climate Data for Fairmont 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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