Mason City Iowa Climate Data

Monthly Average Climate Data for Mason City Iowa

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-13.8 °C-4.4 °C23.62 mm
February-11.6 °C-1.9 °C28.7 mm
March-4.8 °C5.1 °C51.31 mm
April1.7 °C13.6 °C101.35 mm
May8.6 °C20.4 °C135.89 mm
June14.6 °C26.1 °C138.94 mm
July16.5 °C27.7 °C116.84 mm
August14.9 °C26.4 °C97.28 mm
September10.2 °C23.1 °C84.84 mm
October3.2 °C15.6 °C65.53 mm
November-3.7 °C6.4 °C44.7 mm
December-9.8 °C-1.2 °C33.27 mm
Annual2.2 °C13.1 °C922.27 mm

Climate Data for Mason City 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 : -28.9°C to -26.1°C
Plant Hardiness Zone - 2012Zone 5a : -28.9°C to -26.1°C
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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