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Key findings

  • The highest monthly average temperature in Grand Detour for July is 71 degrees
  • The lowest monthly average temperature in Grand Detour for January is 22 degrees
  • The most monthly precipitation in Grand Detour occurs in October with 7.1 inches
  • The air quality index in Grand Detour is 16% better than the national average
  • The pollution index in Grand Detour is 59% better than the national average

Compare Grand Detour, IL Weather

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      Grand Detour 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
      January14°F30°F22°F3.8"
      February14°F32°F23°F3.4"
      March29°F48°F37°F4.3"
      April39°F62°F50°F4.5"
      May50°F74°F61°F5.4"
      June59°F81°F70°F6.7"
      July61°F82°F71°F6.0"
      August59°F81°F69°F6.4"
      September51°F76°F63°F3.8"
      October41°F63°F51°F7.1"
      November29°F48°F38°F3.9"
      December19°F34°F26°F3.6"

      Grand Detour 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.
      IndexGrand DetourIllinoisNational
      Air quality index424150
      Pollution index2,097,7403,347,2955,066,862

      Grand Detour 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

      Grand Detour air quality information

      PollutantTotal
      Arsenic0.001%
      Benzene0.060%
      Carbon Tetrachloride0.000%
      Lead0.001%
      Mercury0.300%

      Average monthly Grand Detour temperature with heat index

      Grand Detour monthly precipitation with daily maximum

      Grand Detour monthly snow depth with daily maximum

      Grand Detour monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      West Brooklyn, IL1670100%
      Amboy, IL2,5190100%
      Franklin Grove, IL1,0604216%
      Oregon, IL3,6574216%
      Mount Morris, IL3,0084216%
      Grand Detour, IL4894216%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Berlin, GA4893530%
      Fletcher, OH4894510%
      Isleta Village Proper, NM489536%
      Parryville, PA4894216%
      Cooper Landing, AK4893138%
      Grand Detour, IL4894216%
      Source: The Grand Detour, 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.