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Weather Quick Facts

  • The highest monthly average temperature in Monmouth for July is 74.7 degrees
  • The lowest monthly average temperature in Monmouth for January is 24.4 degrees
  • The most monthly precipitation in Monmouth occurs in September with 8.9 inches
  • The air quality index in Monmouth is 24% better than the national average
  • The pollution index in Monmouth is 37% better than the national average

Compare Monmouth, IL Weather

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      Monmouth 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
      January17°F34°F24°F3.4"
      February18°F36°F26°F3.6"
      March32°F52°F41°F3.5"
      April41°F65°F52°F6.9"
      May52°F74°F63°F7.1"
      June62°F83°F72°F7.9"
      July65°F86°F75°F8.4"
      August63°F84°F73°F7.4"
      September54°F78°F65°F8.9"
      October44°F66°F54°F5.8"
      November32°F52°F41°F4.0"
      December22°F37°F29°F4.5"

      Monmouth 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.
      IndexMonmouthIllinoisNational
      Air quality index324142
      Pollution index1,709,2303,148,6942,726,193

      Monmouth air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality300
      Days with moderate air quality65
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Monmouth air quality information

      PollutantTotal
      Arsenic0.001%
      Benzene0.050%
      Carbon Tetrachloride0.040%
      Lead0.001%
      Mercury0.001%

      Average monthly Monmouth temperature with heat index

      Monmouth monthly precipitation with daily maximum

      Monmouth monthly snow depth with daily maximum

      Monmouth monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Roseville, IL8522942.0%
      Biggsville, IL4382942.0%
      Stronghurst, IL1,0662942.0%
      Kirkwood, IL7422942.0%
      Media, IL1102942.0%
      Monmouth, IL8,8373236.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Glencoe, IL8,8365510.0%
      Clarendon Hills, IL8,8345510.0%
      Whitestown, IN8,842548.0%
      Frankfort Square, IL8,8315510.0%
      Sans Souci, SC8,844468.0%
      Monmouth, IL8,8373236.0%
      Source: The Monmouth, 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.