Waterloo Iowa Climate Data

Monthly Average Climate Data for Waterloo Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January9.5 °F26.5 °F1.12 in.
February13.6 °F30.9 °F1.21 in.
March25.1 °F44.3 °F2.09 in.
April36.8 °F58.8 °F4.1 in.
May49.2 °F70.5 °F4.85 in.
June60.0 °F80.3 °F5.72 in.
July63.0 °F83.3 °F4.81 in.
August60.3 °F81.4 °F4.24 in.
September51.5 °F75.4 °F3.64 in.
October39.2 °F61.9 °F2.99 in.
November26.9 °F45.7 °F2.02 in.
December16.3 °F32.5 °F1.57 in.
Annual37.6 °F57.6 °F38.36 in.

Climate Data for Waterloo Iowa

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 21 - May 31
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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