TODAY MAY12
TEMPERATURE52
HUMIDITY41
PRESSURE30.49
WIND COND.80 11.2
  • 6843Thu
  • 6948Fri
  • 6751Sat20%
  • 7256Sun
  • 7355Mon
daynightWeather update from Aurora Municipal Airport at

Key findings

  • The highest monthly average temperature in Somonauk for July is 73 degrees
  • The lowest monthly average temperature in Somonauk for January is 23.1 degrees
  • The most monthly precipitation in Somonauk occurs in June with 4.5 inches
  • The air quality index in Somonauk is 100% better than the national average
  • The pollution index in Somonauk is 63% better than the national average

Compare Somonauk, IL Weather

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      Somonauk 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
      January15°F32°F23°F1.5"
      February16°F34°F24°F1.4"
      March29°F49°F38°F2.3"
      April39°F62°F50°F3.9"
      May49°F73°F61°F4.3"
      June59°F82°F70°F4.5"
      July62°F84°F73°F4.3"
      August60°F82°F71°F4.3"
      September53°F77°F64°F2.9"
      October42°F64°F52°F3.6"
      November30°F50°F40°F2.1"
      December20°F36°F28°F2.2"

      Somonauk 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.
      IndexSomonaukIllinoisNational
      Air quality index04150
      Pollution index1,874,4903,347,2955,066,862

      Somonauk air quality information

      MeasurementTotal
      Days measured335
      Days with good air quality334
      Days with moderate air quality1
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Somonauk air quality information

      PollutantTotal
      Arsenic0.002%
      Benzene0.030%
      Carbon Tetrachloride0.010%
      Lead0.010%
      Mercury0.010%

      Average monthly Somonauk temperature with heat index

      Somonauk monthly precipitation with daily maximum

      Somonauk monthly snow depth with daily maximum

      Somonauk monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Newark, IL1,1390100%
      Leland, IL8440100%
      Lisbon, IL3970100%
      Big Rock, IL1,1390100%
      Sandwich, IL7,4910100%
      Somonauk, IL2,1060100%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      New Eagle, PA2,1065612%
      New Athens, IL2,106548%
      Cleona, PA2,1054216%
      Sigourney, IA2,1053530%
      Leetonia, OH2,1054216%
      Somonauk, IL2,1060100%
      Source: The Somonauk, 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.