Royal Iowa Climate Data

Monthly Average Climate Data for Royal Iowa

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-13.6 °C-3.8 °C17.78 mm
February-11.3 °C-1.5 °C21.08 mm
March-4.7 °C5.8 °C41.4 mm
April1.8 °C14.2 °C85.85 mm
May8.8 °C20.9 °C108.46 mm
June14.9 °C26.6 °C122.68 mm
July16.9 °C28.4 °C90.17 mm
August15.4 °C27.1 °C96.01 mm
September10.6 °C23.7 °C80.52 mm
October3.3 °C16.1 °C59.44 mm
November-3.9 °C6.8 °C36.58 mm
December-10.2 °C-0.9 °C24.38 mm
Annual2.3 °C13.6 °C784.35 mm

Climate Data for Royal 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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