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Key findings

  • The highest monthly average temperature in Salem for July is 78 degrees
  • The lowest monthly average temperature in Salem for January is 32 degrees
  • The most monthly precipitation in Salem occurs in September with 8.9 inches
  • The air quality index in Salem is 14% better than the national average
  • The pollution index in Salem is 87% better than the national average

Compare Salem, IL Weather

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      Salem 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
      January25°F41°F32°F3.5"
      February27°F44°F34°F2.0"
      March39°F58°F47°F3.7"
      April48°F69°F58°F7.8"
      May57°F77°F66°F5.4"
      June66°F86°F76°F8.3"
      July68°F88°F78°F7.4"
      August66°F87°F76°F7.2"
      September59°F81°F69°F8.9"
      October48°F70°F58°F5.6"
      November38°F57°F47°F4.2"
      December30°F45°F37°F4.9"

      Salem 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.
      IndexSalemIllinoisNational
      Air quality index434150
      Pollution index647,2803,347,2955,066,862

      Salem air quality information

      MeasurementTotal
      Days measured344
      Days with good air quality269
      Days with moderate air quality74
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Salem air quality information

      PollutantTotal
      Arsenic0.001%
      Benzene0.020%
      Carbon Tetrachloride0.000%
      Lead0.000%
      Mercury0.000%

      Average monthly Salem temperature with heat index

      Salem monthly precipitation with daily maximum

      Salem monthly snow depth with daily maximum

      Salem monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Kinmundy, IL1,0074020%
      Farina, IL6474020%
      Kell, IL1644314%
      Iuka, IL4904314%
      Vernon, IL1114314%
      Salem, IL6,9304314%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Laurel, MT6,9312158%
      Lakes of the Four Seasons, IN6,9323726%
      Kathleen, FL6,9323628%
      Great Neck Plaza, NY6,924512%
      Parkville, PA6,9374216%
      Salem, IL6,9304314%
      Source: The Salem, 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.