Monticello Iowa Climate Data

Monthly Average Climate Data for Monticello Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January10.7 °F27.7 °F1.26 in.
February14.3 °F32.1 °F1.46 in.
March25.8 °F45.4 °F2.23 in.
April36.8 °F59.6 °F3.84 in.
May48.6 °F70.8 °F4.51 in.
June59.0 °F80.2 °F5.72 in.
July62.3 °F83.2 °F4.72 in.
August59.9 °F81.6 °F4.44 in.
September51.0 °F75.0 °F3.67 in.
October39.2 °F62.1 °F3.16 in.
November27.7 °F46.5 °F2.23 in.
December17.3 °F33.4 °F1.7 in.
Annual37.7 °F58.1 °F38.94 in.

Climate Data for Monticello Iowa

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 1 - May 10
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 ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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