Ottumwa Iowa Climate Data

Monthly Average Climate Data for Ottumwa Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January14.7 °F31.8 °F1.45 in.
February18.2 °F36.5 °F1.68 in.
March29.0 °F49.7 °F2.34 in.
April40.2 °F62.3 °F3.9 in.
May51.8 °F72.5 °F5.1 in.
June62.2 °F82.2 °F5.67 in.
July65.4 °F86.0 °F4.27 in.
August63.3 °F83.9 °F4.07 in.
September54.2 °F76.8 °F3.99 in.
October42.5 °F64.9 °F2.9 in.
November30.6 °F49.0 °F2.19 in.
December20.7 °F36.8 °F1.71 in.
Annual41.1 °F61 °F39.27 in.

Climate Data for Ottumwa Iowa

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation