TODAY DEC18
TEMPERATURE28
HUMIDITY81
PRESSURE102370
WIND COND.300 9.4
  • 3327Thu30%80%
  • 3312Fri50%
  • 2512Sat
  • 2920Sun
  • 3428Mon
daynightWeather update from Chicago/Waukegan Regional Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Round Lake for July is 72 degrees
  • The lowest monthly average temperature in Round Lake for January is 23.8 degrees
  • The most monthly precipitation in Round Lake occurs in June with 4.5 inches
  • The air quality index in Round Lake is 7% better than the national average
  • The pollution index in Round Lake is 80% better than the national average

Compare Round Lake, IL Weather

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      Round Lake 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
      January16°F32°F24°F1.4"
      February17°F33°F25°F1.5"
      March28°F45°F36°F2.6"
      April37°F57°F46°F4.1"
      May47°F68°F57°F3.7"
      June57°F77°F67°F4.5"
      July63°F82°F72°F4.4"
      August62°F80°F71°F3.7"
      September55°F73°F64°F3.3"
      October44°F62°F52°F3.4"
      November33°F49°F40°F2.0"
      December22°F36°F29°F2.5"

      Round Lake 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.
      IndexRound LakeIllinoisNational
      Air quality index394142
      Pollution index543,5163,148,6942,726,193

      Round Lake air quality

      MeasurementTotal
      Days measured203
      Days with good air quality174
      Days with moderate air quality28
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.000%
      Benzene0.004%
      Carbon Tetrachloride0.000%
      Lead0.000%
      Mercury0.000%

      Average monthly Round Lake temperature with heat index

      Round Lake monthly precipitation with daily maximum

      Round Lake monthly snow depth with daily maximum

      Round Lake monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Bloomfield, WI4,7253726.0%
      Greenwood, IL3523726.0%
      Grayslake, IL20,4823922.0%
      Libertyville, IL20,3003922.0%
      Third Lake, IL1,1603922.0%
      Round Lake, IL18,2353922.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      North Massapequa, NY18,239512.0%
      Trenton, MI18,2145612.0%
      Marshfield, WI18,2143432.0%
      San Carlos Park, FL18,2563628.0%
      Steinbach, MB18,212n/a 
      Round Lake, IL18,2353922.0%
      Source: The Round Lake, 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.