Marathon Iowa Climate Data

Monthly Average Climate Data for Marathon Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January7.9 °F25.6 °F0.72 in.
February12.2 °F29.9 °F0.85 in.
March24.2 °F43.4 °F1.74 in.
April35.7 °F58.3 °F3.52 in.
May48.2 °F70.0 °F4.33 in.
June58.7 °F79.8 °F5.09 in.
July62.1 °F82.7 °F3.43 in.
August59.6 °F80.2 °F4.28 in.
September51.1 °F74.6 °F3.22 in.
October38.4 °F61.7 °F2.46 in.
November25.4 °F44.8 °F1.47 in.
December14.1 °F30.8 °F0.99 in.
Annual36.5 °F56.8 °F32.1 in.

Climate Data for Marathon Iowa

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 11 - May 20
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 ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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