Freeport Illinois Climate Data

Monthly Average Climate Data for Freeport Illinois

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-11.2 °C-1.9 °C39.12 mm
February-9.3 °C0.4 °C42.67 mm
March-3.4 °C7.3 °C52.83 mm
April2.4 °C14.8 °C92.46 mm
May9 °C21.2 °C112.78 mm
June14.6 °C26.4 °C138.43 mm
July16.5 °C28 °C113.28 mm
August15.3 °C27.2 °C99.57 mm
September10.6 °C23.7 °C104.39 mm
October4.2 °C16.6 °C73.41 mm
November-1.9 °C8.1 °C56.9 mm
December-7.7 °C1.1 °C47.5 mm
Annual3.3 °C14.4 °C973.34 mm

Climate Data for Freeport Illinois

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -26.1°C to -23.3°C
Plant Hardiness Zone - 2012Zone 5a : -28.9°C to -26.1°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation