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Key findings

  • The highest monthly average temperature in Waterloo for July is 73.7 degrees
  • The lowest monthly average temperature in Waterloo for January is 18.7 degrees
  • The most monthly precipitation in Waterloo occurs in June with 6.5 inches
  • The air quality index in Waterloo is 22% better than the national average
  • The pollution index in Waterloo is 85% better than the national average

Compare Waterloo, IA Weather

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      Waterloo Average Temperature

      In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
      MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
      January9°F29°F19°F1.3"
      February11°F33°F22°F1.2"
      March25°F49°F36°F1.9"
      April36°F63°F49°F5.0"
      May47°F74°F60°F4.8"
      June58°F83°F71°F6.5"
      July61°F86°F74°F4.9"
      August58°F84°F71°F4.0"
      September51°F79°F64°F3.4"
      October39°F65°F51°F3.2"
      November27°F50°F38°F1.8"
      December14°F33°F23°F2.1"

      Waterloo air quality index & pollution index

      In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
      IndexWaterlooIowaNational
      Air quality index393950
      Pollution index416,1141,154,5352,726,193

      Waterloo air quality information

      MeasurementTotal
      Days measured363
      Days with good air quality286
      Days with moderate air quality77
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Waterloo air quality information

      PollutantTotal
      Arsenic0.000%
      Benzene0.004%
      Carbon Tetrachloride0.001%
      Lead0.000%
      Mercury0.000%

      Average monthly Waterloo temperature with heat index

      Waterloo monthly precipitation with daily maximum

      Waterloo monthly snow depth with daily maximum

      Waterloo monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Jesup, IA2,8093922.0%
      Elk Run Heights, IA1,0063922.0%
      Cedar Falls, IA40,8283922.0%
      Janesville, IA7953922.0%
      La Porte City, IA2,4033922.0%
      Waterloo, IA68,3573922.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      St. Charles, MO68,341548.0%
      Jacksonville, NC68,4044216.0%
      Frederick, MD68,2294020.0%
      Mount Vernon, NY68,217512.0%
      Pasco, WA68,5673726.0%
      Waterloo, IA68,3573922.0%
      Source: The Waterloo, IA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.