Frankfort Illinois Climate Data

Monthly Average Climate Data for Frankfort Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-8.6 °C0.1 °C55.88 mm
February-7.1 °C2.2 °C54.1 mm
March-1.8 °C8.5 °C61.72 mm
April4.1 °C15.6 °C99.31 mm
May10 °C21.6 °C118.62 mm
June15.6 °C27.1 °C118.11 mm
July18.2 °C29.3 °C117.35 mm
August17.2 °C28.2 °C105.92 mm
September13.1 °C24.8 °C86.87 mm
October6.2 °C17.3 °C87.12 mm
November0.3 °C9.7 °C66.04 mm
December-5.4 °C2.8 °C56.64 mm
Annual5.2 °C15.6 °C1027.68 mm

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 : -23.3°C to -20.6°C
Plant Hardiness Zone - 2012Zone 5b : -26.1°C to -23.3°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation