Freeport Illinois Climate Data

Monthly Average Climate Data for Freeport Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January11.8 °F28.5 °F1.54 in.
February15.2 °F32.8 °F1.68 in.
March25.8 °F45.1 °F2.08 in.
April36.4 °F58.7 °F3.64 in.
May48.2 °F70.2 °F4.44 in.
June58.2 °F79.5 °F5.45 in.
July61.7 °F82.4 °F4.46 in.
August59.6 °F80.9 °F3.92 in.
September51.0 °F74.6 °F4.11 in.
October39.6 °F61.9 °F2.89 in.
November28.6 °F46.6 °F2.24 in.
December18.2 °F33.9 °F1.87 in.
Annual37.9 °F57.9 °F38.32 in.

Climate Data for Freeport Illinois

Average First Frost DateNov. 11 - Nov. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost125-150 Days
Plant Hardiness ZoneZone 5a : -20°F to -15°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation