Monmouth Iowa Climate Data

Monthly Average Climate Data for Monmouth Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January11.0 °F27.9 °F1.34 in.
February14.5 °F32.3 °F1.57 in.
March25.8 °F45.5 °F2.24 in.
April36.8 °F59.6 °F3.68 in.
May48.7 °F70.9 °F4.38 in.
June59.0 °F80.2 °F5.21 in.
July62.3 °F83.1 °F4.29 in.
August60.0 °F81.5 °F4.21 in.
September51.2 °F75.3 °F3.63 in.
October39.5 °F62.3 °F2.99 in.
November27.9 °F46.7 °F2.14 in.
December17.6 °F33.6 °F1.73 in.
Annual37.9 °F58.2 °F37.41 in.

Climate Data for Monmouth Iowa

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 11 - May 20
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5a : -20°F to -15°F
Plant Hardiness Zone - 2012Zone 5a : -20°F to -15°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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