TODAY MAY05
TEMPERATURE61
HUMIDITY39
PRESSURE30.13
WIND COND.330 13
  • 5839Thu70%
  • 5735Fri
  • 5938Sat30%
  • 5735Sun
  • 5936Mon
daynightWeather update from Albertus Airport at

Key findings

  • The highest monthly average temperature in Rock City for July is 71.8 degrees
  • The lowest monthly average temperature in Rock City for January is 21.7 degrees
  • The most monthly precipitation in Rock City occurs in August with 7.3 inches
  • The air quality index in Rock City is 16% better than the national average
  • The pollution index in Rock City is 65% better than the national average

Compare Rock City, IL Weather

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      Rock City 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
      January14°F30°F22°F2.9"
      February15°F31°F23°F2.3"
      March29°F47°F37°F3.6"
      April38°F61°F48°F5.4"
      May49°F72°F60°F5.5"
      June58°F80°F69°F6.3"
      July62°F82°F72°F5.8"
      August60°F81°F70°F7.3"
      September52°F75°F63°F4.7"
      October42°F62°F51°F5.8"
      November30°F48°F39°F4.0"
      December19°F33°F26°F3.4"

      Rock City 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.
      IndexRock CityIllinoisNational
      Air quality index424150
      Pollution index1,767,9803,347,2955,066,862

      Rock City air quality information

      MeasurementTotal
      Days measured341
      Days with good air quality240
      Days with moderate air quality100
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Rock City air quality information

      PollutantTotal
      Arsenic0.001%
      Benzene0.040%
      Carbon Tetrachloride0.010%
      Lead0.001%
      Mercury0.003%

      Average monthly Rock City temperature with heat index

      Rock City monthly precipitation with daily maximum

      Rock City monthly snow depth with daily maximum

      Rock City monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Juda, WI2893824%
      Orfordville, WI1,3113824%
      Monroe, WI10,7713824%
      Brodhead, WI3,3193824%
      German Valley, IL4864216%
      Rock City, IL2944216%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      St. Martin, OH2944314%
      Blanford, IN2944510%
      Litchfield, NE2941962%
      Hall Summit, LA2943922%
      Winchester Bay, OR2941962%
      Rock City, IL2944216%
      Source: The Rock City, 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.