TODAY DEC05
TEMPERATURE15
HUMIDITY59
PRESSURE102470
WIND COND.
  • 2312Thu
  • 3321Fri
  • 4433Sat
  • 5144Sun80%
  • 5433Mon50%30%
daynightWeather update from Effingham, Effingham County Memorial Airport at
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Weather Quick Facts

  • The highest monthly average temperature in St. Elmo for August is 75.9 degrees
  • The lowest monthly average temperature in St. Elmo for January is 29.5 degrees
  • The most monthly precipitation in St. Elmo occurs in November with 11.8 inches
  • The air quality index in St. Elmo is 5% better than the national average
  • The pollution index in St. Elmo is 43% better than the national average

Compare St. Elmo, IL Weather

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      St. Elmo 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
      January22°F38°F30°F1.7"
      February25°F40°F32°F2.3"
      March36°F54°F44°F1.1"
      April46°F67°F55°F4.3"
      May55°F76°F64°F0.0"
      June66°F86°F75°F3.0"
      July66°F86°F75°F7.9"
      August66°F87°F76°F4.8"
      September59°F81°F69°F8.6"
      October47°F69°F57°F1.4"
      November36°F56°F46°F11.8"
      December25°F38°F31°F7.1"

      St. Elmo 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.
      IndexSt. ElmoIllinoisNational
      Air quality index404142
      Pollution index1,561,3103,148,6942,726,193

      St. Elmo air quality

      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

      Air quality details

      PollutantTotal
      Arsenic0.001%
      Benzene0.040%
      Carbon Tetrachloride0.010%
      Lead0.002%
      Mercury0.002%

      Average monthly St. Elmo temperature with heat index

      St. Elmo monthly precipitation with daily maximum

      St. Elmo monthly snow depth with daily maximum

      St. Elmo monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Farina, IL7494020.0%
      Mason, IL2434020.0%
      Beecher City, IL3734020.0%
      Iola, IL914020.0%
      St. Peter, IL4384020.0%
      St. Elmo, IL1,4664020.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Russell, GA1,4664412.0%
      Tonka Bay, MN1,466468.0%
      Averill Park, NY1,4663726.0%
      Munford, AL1,4653824.0%
      Lake Don Pedro, CA1,4653922.0%
      St. Elmo, IL1,4664020.0%
      Source: The St. Elmo, 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.