Frankfort Illinois Climate Data

Monthly Average Climate Data for Frankfort Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January16.6 °F32.1 °F2.2 in.
February19.3 °F36.0 °F2.13 in.
March28.7 °F47.3 °F2.43 in.
April39.3 °F60.0 °F3.91 in.
May50.0 °F70.8 °F4.67 in.
June60.0 °F80.8 °F4.65 in.
July64.8 °F84.7 °F4.62 in.
August63.0 °F82.8 °F4.17 in.
September55.5 °F76.6 °F3.42 in.
October43.1 °F63.1 °F3.43 in.
November32.5 °F49.4 °F2.6 in.
December22.2 °F37.0 °F2.23 in.
Annual41.3 °F60.1 °F40.46 in.

Climate Data for Frankfort Illinois

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateMay 1 - May 10
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 ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation