Charter Oak Iowa Climate Data

Monthly Average Climate Data for Charter Oak Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January10.2 °F28.9 °F0.7 in.
February14.4 °F33.8 °F0.91 in.
March25.5 °F47.2 °F1.73 in.
April36.3 °F60.6 °F3.39 in.
May48.6 °F71.4 °F4.56 in.
June59.5 °F81.3 °F4.84 in.
July63.2 °F84.4 °F3.89 in.
August60.4 °F82.3 °F4.3 in.
September51.4 °F76.4 °F3.16 in.
October38.9 °F63.5 °F2.32 in.
November25.9 °F47.2 °F1.39 in.
December15.8 °F33.8 °F1.16 in.
Annual37.5 °F59.2 °F32.35 in.

Climate Data for Charter Oak Iowa

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 1 - May 10
Average Days With Frost150-180 Days
Plant Hardiness Zone - 2023Zone 5a : -20°F to -15°F
Plant Hardiness Zone - 2012Zone 5a : -20°F to -15°F
Current Drought ConditionsSevere Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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