TODAY MAR01
TEMPERATURE45
HUMIDITY74
PRESSURE30.01
WIND COND.340 22.3
  • 4828Mon
  • 5233Tue
  • 5833Wed
  • 5532Thu
  • 5332Fri
daynightWeather update from St. Louis Downtown Airport at

Key findings

  • The highest monthly average temperature in Smithton for August is 80 degrees
  • The lowest monthly average temperature in Smithton for December is 33 degrees
  • The most monthly precipitation in Smithton occurs in September with 16.1 inches
  • The air quality index in Smithton is 9% worse than the national average
  • The pollution index in Smithton is 20% worse than the national average

Compare Smithton, IL Weather

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      Smithton 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
      January28°F43°F34°F9.8"
      February26°F45°F34°F4.7"
      March38°F60°F48°F2.9"
      April45°F68°F56°F5.6"
      May56°F79°F67°F3.7"
      June65°F88°F76°F7.6"
      July67°F88°F77°F12.3"
      August70°F93°F80°F7.2"
      September61°F85°F72°F16.1"
      October49°F72°F59°F7.5"
      November38°F59°F47°F11.9"
      December27°F42°F33°F2.9"

      Smithton 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.
      IndexSmithtonIllinoisNational
      Air quality index544150
      Pollution index6,055,6403,347,2955,066,862

      Smithton air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality134
      Days with moderate air quality221
      Days w/ poor A.Q. for sensitive groups8
      Days with unhealthy air quality2

      Smithton air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.070%
      Carbon Tetrachloride0.040%
      Lead0.100%
      Mercury0.230%

      Average monthly Smithton temperature with heat index

      Smithton monthly precipitation with daily maximum

      Smithton monthly snow depth with daily maximum

      Smithton monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Caseyville, IL4,263548%
      St. Louis, MO316,030548%
      Centreville, IL5,127548%
      Swansea, IL13,722548%
      Lebanon, IL4,369548%
      Smithton, IL3,792548%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Clifton Forge, VA3,7923824%
      Highland Acres, DE3,7924216%
      Vienna, GA3,7913922%
      Mirrormont, WA3,7914510%
      Holden Heights, FL3,7953922%
      Smithton, IL3,792548%
      Source: The Smithton, 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.