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Key findings

  • The highest monthly average temperature in Marengo for July is 72 degrees
  • The lowest monthly average temperature in Marengo for January is 23 degrees
  • The most monthly precipitation in Marengo occurs in August with 5.9 inches
  • The air quality index in Marengo is 16% better than the national average
  • The pollution index in Marengo is 89% better than the national average

Compare Marengo, IL Weather

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      Marengo 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
      January16°F31°F23°F2.8"
      February17°F32°F24°F2.8"
      March30°F47°F37°F4.6"
      April39°F61°F49°F5.8"
      May50°F72°F60°F5.3"
      June59°F80°F69°F5.6"
      July63°F82°F72°F5.8"
      August61°F81°F70°F5.9"
      September54°F75°F63°F3.7"
      October43°F63°F52°F5.8"
      November32°F49°F39°F4.0"
      December21°F34°F27°F3.1"

      Marengo 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.
      IndexMarengoIllinoisNational
      Air quality index424150
      Pollution index543,5163,347,2955,066,862

      Marengo air quality information

      MeasurementTotal
      Days measured341
      Days with good air quality240
      Days with moderate air quality100
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Marengo air quality information

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

      Average monthly Marengo temperature with heat index

      Marengo monthly precipitation with daily maximum

      Marengo monthly snow depth with daily maximum

      Marengo monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Greenwood, IL4253726%
      Wonder Lake, IL3,7393922%
      Caledonia, IL2324216%
      Garden Prairie, IL1834216%
      Crystal Lake, IL40,4754216%
      Marengo, IL8,0814216%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Union, SC8,0814412%
      Ashland, WI8,0833530%
      Warrenton, MO8,077548%
      Whitehouse, TX8,0693628%
      Chestnut Ridge, NY8,096512%
      Marengo, IL8,0814216%
      Source: The Marengo, 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.