TODAY NOV07
TEMPERATURE50
HUMIDITY74
PRESSURE102710
WIND COND.20 16.6
  • 6343Fri
  • 6052Sat30%80%
  • 6644Sun
  • 6445
  • 6754Tue20%
daynightWeather update from St. Louis Downtown Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Waterloo for August is 79.4 degrees
  • The lowest monthly average temperature in Waterloo for February is 33 degrees
  • The most monthly precipitation in Waterloo occurs in January with 11.3 inches
  • The air quality index in Waterloo is 28% worse than the national average
  • The pollution index in Waterloo is 122% worse than the national average

Compare Waterloo, IL 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
      January28°F43°F35°F11.3"
      February26°F43°F33°F3.1"
      March39°F61°F49°F5.3"
      April45°F68°F56°F5.9"
      May56°F80°F68°F4.4"
      June65°F88°F76°F4.0"
      July67°F88°F77°F9.1"
      August69°F91°F79°F7.4"
      September60°F84°F71°F8.8"
      October48°F72°F59°F4.0"
      November37°F59°F47°F8.5"
      December27°F42°F34°F3.1"

      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.
      IndexWaterlooIllinoisNational
      Air quality index544142
      Pollution index6,055,6403,148,6942,726,193

      Waterloo air quality

      MeasurementTotal
      Days measured365
      Days with good air quality134
      Days with moderate air quality221
      Days w/ poor A.Q. for sensitive groups8
      Days with unhealthy air quality2

      Air quality details

      PollutantTotal
      Arsenic0.010%
      Benzene0.070%
      Carbon Tetrachloride0.040%
      Lead0.100%
      Mercury0.230%

      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.
      Lakeshire, MO1,435548.0%
      Sunset Hills, MO8,466548.0%
      Affton, MO19,580548.0%
      Wilbur Park, MO406548.0%
      Smithton, IL4,019548.0%
      Waterloo, IL10,417548.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Pine Hill, NJ10,418512.0%
      Oak Hills, CA10,4158978.0%
      Frederick, CO10,414476.0%
      Mono, ON10,413n/a 
      Portage, WI10,4123530.0%
      Waterloo, IL10,417548.0%
      Source: The Waterloo, IL 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.