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Key findings

  • The highest monthly average temperature in Iroquois for July is 74 degrees
  • The lowest monthly average temperature in Iroquois for January is 25 degrees
  • The most monthly precipitation in Iroquois occurs in August with 9.8 inches
  • The air quality index in Iroquois is 16% better than the national average
  • The pollution index in Iroquois is 60% better than the national average

Compare Iroquois, IL Weather

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      Iroquois 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
      January18°F34°F25°F3.2"
      February19°F36°F27°F2.6"
      March32°F51°F40°F3.2"
      April41°F64°F51°F5.2"
      May51°F74°F62°F5.3"
      June61°F83°F71°F9.7"
      July64°F86°F74°F5.3"
      August62°F84°F73°F9.8"
      September55°F79°F66°F6.1"
      October44°F65°F54°F7.0"
      November34°F52°F42°F3.8"
      December24°F38°F31°F3.7"

      Iroquois 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.
      IndexIroquoisIllinoisNational
      Air quality index424150
      Pollution index2,020,4303,347,2955,066,862

      Iroquois air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality276
      Days with moderate air quality89
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Iroquois air quality information

      PollutantTotal
      Arsenic0.002%
      Benzene0.090%
      Carbon Tetrachloride0.000%
      Lead0.000%
      Mercury0.001%

      Average monthly Iroquois temperature with heat index

      Iroquois monthly precipitation with daily maximum

      Iroquois monthly snow depth with daily maximum

      Iroquois monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Sammons Point, IL3460100%
      Milford, IL1,2464216%
      Martinton, IL3254216%
      Watseka, IL5,3184216%
      Brook, IN1,0154216%
      Iroquois, IL1654216%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Latty, OH1654510%
      Rackerby, CA1654412%
      Parkdale, AR1653432%
      Idanha, OR1653236%
      Fort Apache, AZ1654412%
      Iroquois, IL1654216%
      Source: The Iroquois, 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.