TODAY DEC23
TEMPERATURE34
HUMIDITY67
PRESSURE102680
WIND COND.130 9.4
  • 4640Mon30%
  • 4841Tue30%80%
  • 494460%30%
  • 5650Thu
  • 5850Fri
daynightWeather update from Southern Illinois Airport at
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Weather Quick Facts

  • The highest monthly average temperature in St. Johns for July is 77.9 degrees
  • The lowest monthly average temperature in St. Johns for January is 33.8 degrees
  • The most monthly precipitation in St. Johns occurs in April with 6.2 inches
  • The air quality index in St. Johns is 2% worse than the national average
  • The pollution index in St. Johns is 79% better than the national average

Compare St. Johns, IL Weather

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      St. Johns 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°F44°F34°F2.3"
      February27°F46°F36°F2.5"
      March38°F60°F48°F4.8"
      April47°F70°F58°F6.2"
      May56°F78°F67°F4.9"
      June66°F88°F76°F4.1"
      July68°F89°F78°F5.0"
      August66°F88°F76°F3.5"
      September57°F81°F68°F3.4"
      October46°F71°F58°F3.6"
      November36°F58°F46°F3.7"
      December30°F47°F38°F3.7"

      St. Johns 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. JohnsIllinoisNational
      Air quality index434142
      Pollution index569,1783,148,6942,726,193

      St. Johns air quality

      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

      Air quality details

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

      Average monthly St. Johns temperature with heat index

      St. Johns monthly precipitation with daily maximum

      St. Johns monthly snow depth with daily maximum

      St. Johns monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Buckner, IL3484314.0%
      Mulkeytown, IL1284314.0%
      Zeigler, IL1,7794314.0%
      Hurst, IL7564314.0%
      Du Quoin, IL5,7234314.0%
      St. Johns, IL1604314.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Tomales, CA1603432.0%
      Dewy Rose, GA1604412.0%
      Alexander, IA1601570.0%
      Andover, IA1604216.0%
      Stockton, IA160468.0%
      St. Johns, IL1604314.0%
      Source: The St. Johns, 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.