Mount Vernon Iowa Climate Data

Monthly Average Climate Data for Mount Vernon Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January11.4 °F28.3 °F1.27 in.
February15.1 °F32.8 °F1.49 in.
March26.2 °F46.0 °F2.24 in.
April37.2 °F60.3 °F3.81 in.
May49.0 °F71.2 °F4.7 in.
June59.3 °F80.4 °F5.46 in.
July62.7 °F83.5 °F4.51 in.
August60.2 °F81.8 °F4.36 in.
September51.5 °F75.6 °F3.75 in.
October39.7 °F62.7 °F2.99 in.
November27.9 °F47.0 °F2.26 in.
December17.6 °F33.8 °F1.71 in.
Annual38.2 °F58.6 °F38.55 in.

Climate Data for Mount Vernon 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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