wmoUnit:degC Vandalia, IL Weather - Forecast & Monthly Averages
TODAY MAR03
TEMPERATURE73
HUMIDITY47
PRESSURE101190
WIND COND.180 27.7
  • 7557Mon60%
  • 6444Tue40%20%
  • 6041Wed
  • 5947Thu20%40%
  • 5840Fri70%50%
daynightWeather update from Salem, Salem-Leckrone Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Vandalia for July is 77.6 degrees
  • The lowest monthly average temperature in Vandalia for January is 32.3 degrees
  • The most monthly precipitation in Vandalia occurs in September with 8.9 inches
  • The air quality index in Vandalia is 5% better than the national average
  • The pollution index in Vandalia is 76% better than the national average

Compare Vandalia, IL Weather

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      Vandalia 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"

      Vandalia 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.
      IndexVandaliaIllinoisNational
      Air quality index404142
      Pollution index647,2803,148,6942,726,193

      Vandalia air quality information

      MeasurementTotal
      Days measured245
      Days with good air quality224
      Days with moderate air quality21
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Vandalia air quality information

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

      Average monthly Vandalia temperature with heat index

      Vandalia monthly precipitation with daily maximum

      Vandalia monthly snow depth with daily maximum

      Vandalia monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Brownstown, IL8394020.0%
      Ramsey, IL8714020.0%
      Coffeen, IL6404020.0%
      St. Elmo, IL1,4664020.0%
      Fillmore, IL2964020.0%
      Vandalia, IL6,6154020.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Southgate, FL6,6173824.0%
      Scenic Oaks, TX6,611492.0%
      Red Chute, LA6,6193922.0%
      Trinity, NC6,6194020.0%
      Kentville, NS6,619n/a 
      Vandalia, IL6,6154020.0%
      Source: The Vandalia, 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.