Iowa City Iowa Climate Data

Monthly Average Climate Data for Iowa City Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.6 °F30.2 °F1.19 in.
February17.2 °F34.8 °F1.45 in.
March28.1 °F47.8 °F2.31 in.
April39.3 °F61.8 °F3.82 in.
May51.3 °F72.6 °F4.72 in.
June61.3 °F81.7 °F5.2 in.
July64.8 °F85.1 °F4.3 in.
August62.3 °F83.2 °F4.15 in.
September53.7 °F77.3 °F3.42 in.
October41.6 °F64.1 °F2.97 in.
November29.7 °F48.6 °F2.23 in.
December19.3 °F35.4 °F1.65 in.
Annual40.2 °F60.2 °F37.41 in.

Climate Data for Iowa City Iowa

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