TODAY MAY17
TEMPERATURE63
HUMIDITY100
PRESSURE30.05
WIND COND.90 16.6
  • 7563Tue70%50%
  • 8064Wed50%40%
  • 8365Thu30%30%
  • 8465Fri20%
  • 8466Sat20%30%
daynightWeather update from St. Louis Regional Airport at

Key findings

  • The highest monthly average temperature in Royal Lakes for July is 75.9 degrees
  • The lowest monthly average temperature in Royal Lakes for January is 29.4 degrees
  • The most monthly precipitation in Royal Lakes occurs in April with 9.3 inches
  • The air quality index in Royal Lakes is 9% worse than the national average
  • The pollution index in Royal Lakes is 77% better than the national average

Compare Royal Lakes, IL Weather

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      Royal Lakes 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°F38°F29°F3.3"
      February24°F40°F31°F3.5"
      March36°F55°F44°F3.9"
      April45°F67°F55°F9.3"
      May55°F75°F64°F5.6"
      June64°F84°F73°F7.9"
      July66°F86°F76°F5.0"
      August65°F86°F74°F5.1"
      September57°F80°F67°F6.0"
      October46°F68°F56°F5.6"
      November36°F54°F44°F3.6"
      December28°F42°F34°F3.6"

      Royal Lakes 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.
      IndexRoyal LakesIllinoisNational
      Air quality index544150
      Pollution index1,150,6703,347,2955,066,862

      Royal Lakes air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality134
      Days with moderate air quality221
      Days w/ poor A.Q. for sensitive groups8
      Days with unhealthy air quality2

      Royal Lakes air quality information

      PollutantTotal
      Arsenic0.001%
      Benzene0.030%
      Carbon Tetrachloride0.000%
      Lead0.000%
      Mercury0.000%

      Average monthly Royal Lakes temperature with heat index

      Royal Lakes monthly precipitation with daily maximum

      Royal Lakes monthly snow depth with daily maximum

      Royal Lakes monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Carlinville, IL5,2974020%
      Chesterfield, IL3364020%
      Fidelity, IL161548%
      Bunker Hill, IL1,730548%
      Williamson, IL233548%
      Royal Lakes, IL134548%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Round Mountain, CA1344216%
      Cherry Log, GA1344314%
      Mockingbird Valley, KY134492%
      Brookston, MN1343530%
      Hyampom, CA1342746%
      Royal Lakes, IL134548%
      Source: The Royal Lakes, 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.