TODAY MAY15
TEMPERATURE69
HUMIDITY40
PRESSURE30.23
WIND COND.140 13
  • 7159Sun70%70%
  • 7160Mon60%70%
  • 7562Tue60%
  • 8064Wed
  • 8165Thu
daynightWeather update from Mount Vernon, Mount Vernon Airport at

Key findings

  • The highest monthly average temperature in Mount Vernon for July is 76.7 degrees
  • The lowest monthly average temperature in Mount Vernon for January is 31.8 degrees
  • The most monthly precipitation in Mount Vernon occurs in August with 11 inches
  • The air quality index in Mount Vernon is 14% better than the national average
  • The pollution index in Mount Vernon is 89% better than the national average

Compare Mount Vernon, IL Weather

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      Mount Vernon 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
      January23°F42°F32°F3.7"
      February25°F44°F34°F3.5"
      March37°F58°F46°F5.2"
      April46°F70°F57°F8.7"
      May54°F77°F65°F6.1"
      June63°F87°F74°F8.3"
      July66°F89°F77°F8.1"
      August64°F88°F75°F11.0"
      September57°F81°F68°F5.5"
      October45°F70°F56°F5.6"
      November34°F56°F44°F7.5"
      December28°F45°F36°F6.9"

      Mount Vernon 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.
      IndexMount VernonIllinoisNational
      Air quality index434150
      Pollution index569,1783,347,2955,066,862

      Mount Vernon 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

      Mount Vernon air quality information

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

      Average monthly Mount Vernon temperature with heat index

      Mount Vernon monthly precipitation with daily maximum

      Mount Vernon monthly snow depth with daily maximum

      Mount Vernon monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Ashley, IL5534314%
      Kell, IL1644314%
      Belle Rive, IL3244314%
      Bonnie, IL3754314%
      Irvington, IL7584314%
      Mount Vernon, IL14,8804314%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      West Park, FL14,8844118%
      Manorville, NY14,8854314%
      Oak Park, CA14,8857244%
      Fort Carson, CO14,8734510%
      Forrest City, AR14,8714510%
      Mount Vernon, IL14,8804314%
      Source: The Mount Vernon, 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.