TODAY FEB25
TEMPERATURE35
HUMIDITY87
PRESSURE30.28
WIND COND.310 13
  • 4627Thu
  • 4936Fri30%
  • 5841Sat20%
  • 5632Sun20%
  • 4726Mon
daynightWeather update from Effingham, Effingham County Memorial Airport at

Key findings

  • The highest monthly average temperature in St. Elmo for August is 76 degrees
  • The lowest monthly average temperature in St. Elmo for January is 30 degrees
  • The most monthly precipitation in St. Elmo occurs in November with 11.8 inches
  • The air quality index in St. Elmo is 20% better than the national average
  • The pollution index in St. Elmo is 69% 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 index404150
      Pollution index1,561,3103,347,2955,066,862

      St. Elmo 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

      St. Elmo air quality information

      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

      City, StatePopulationAir Quality IndexNational Avg.
      Iola, IL1484020%
      St. Peter, IL3884020%
      Ramsey, IL1,3744020%
      Brownstown, IL7104020%
      Vandalia, IL6,7584020%
      St. Elmo, IL1,2984020%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Lillian, AL1,2984118%
      South Gull Lake, MI1,2983824%
      Mapleton, IA1,2993530%
      Iowa Colony, TX1,297524%
      Tiltonsville, OH1,2973922%
      St. Elmo, IL1,2984020%
      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.