Ottumwa Iowa Climate Data

Monthly Average Climate Data for Ottumwa Iowa

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-9.6 °C-0.1 °C36.83 mm
February-7.7 °C2.5 °C42.67 mm
March-1.7 °C9.8 °C59.44 mm
April4.6 °C16.8 °C99.06 mm
May11 °C22.5 °C129.54 mm
June16.8 °C27.9 °C144.02 mm
July18.6 °C30 °C108.46 mm
August17.4 °C28.8 °C103.38 mm
September12.3 °C24.9 °C101.35 mm
October5.8 °C18.3 °C73.66 mm
November-0.8 °C9.4 °C55.63 mm
December-6.3 °C2.7 °C43.43 mm
Annual5 °C16.1 °C997.47 mm

Climate Data for Ottumwa Iowa

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -26.1°C to -23.3°C
Plant Hardiness Zone - 2012Zone 5b : -26.1°C to -23.3°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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