Rockford Illinois Climate Data

Monthly Average Climate Data for Rockford Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January12.7 °F28.5 °F1.56 in.
February15.9 °F32.6 °F1.7 in.
March26.3 °F45.0 °F2.13 in.
April37.3 °F58.6 °F3.74 in.
May49.0 °F70.2 °F4.52 in.
June59.0 °F79.9 °F5.53 in.
July62.7 °F83.1 °F3.78 in.
August60.9 °F81.5 °F4.21 in.
September52.5 °F75.0 °F3.35 in.
October40.7 °F62.1 °F2.82 in.
November29.4 °F46.7 °F2.29 in.
December19.1 °F34.1 °F2.05 in.
Annual38.8 °F58.1 °F37.68 in.

Climate Data for Rockford 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 : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation