TODAY APR23
TEMPERATURE48
HUMIDITY71
PRESSURE30.14
WIND COND.110 14.8
  • 5843Sat100%40%
  • 6848Sun
  • 7860Mon
  • 8064Tue
  • 7558Wed
daynightWeather update from Marion - Williamson County Regional Airport at

Key findings

  • The highest monthly average temperature in Royalton for July is 77.9 degrees
  • The lowest monthly average temperature in Royalton for January is 33.8 degrees
  • The most monthly precipitation in Royalton occurs in April with 6.2 inches
  • The air quality index in Royalton is 14% better than the national average
  • The pollution index in Royalton is 89% better than the national average

Compare Royalton, IL Weather

      vs
      How would you rate the weather in Royalton?
      Write a review to give others more information about this area.
      How would you rate the air quality in Royalton?
      Write a review to give others more information about this area.
      See all Royalton poll results

      Royalton 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"

      Royalton 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.
      IndexRoyaltonIllinoisNational
      Air quality index434150
      Pollution index569,1783,347,2955,066,862

      Royalton air quality information

      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

      Royalton air quality information

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

      Average monthly Royalton temperature with heat index

      Royalton monthly precipitation with daily maximum

      Royalton monthly snow depth with daily maximum

      Royalton monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Whiteash, IL3284314%
      Freeman Spur, IL2544314%
      Johnston City, IL3,5214314%
      Sesser, IL1,8614314%
      Valier, IL6014314%
      Royalton, IL1,1244314%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Stafford, KS1,1244020%
      Cyril, OK1,1244314%
      Westlake, TX1,124512%
      Kaaawa, HI1,1243040%
      Alpaugh, CA1,1246632%
      Royalton, IL1,1244314%
      Source: The Royalton, 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.