TODAY MAR03
TEMPERATURE37
HUMIDITY76
PRESSURE29.94
WIND COND. 7.6
  • 4927Wed
  • 4524Thu
  • 4626Fri
  • 4931Sat
  • 5639Sun
daynightWeather update from Sterling Rockfalls at

Key findings

  • The highest monthly average temperature in Sterling for August is 73 degrees
  • The lowest monthly average temperature in Sterling for December is 23 degrees
  • The most monthly precipitation in Sterling occurs in August with 9.2 inches
  • The air quality index in Sterling is 16% better than the national average
  • The pollution index in Sterling is 59% better than the national average

Compare Sterling, IL Weather

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      Sterling 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
      January18°F33°F25°F2.9"
      February17°F32°F24°F2.5"
      March31°F52°F39°F4.5"
      April39°F65°F50°F6.4"
      May50°F76°F62°F3.5"
      June61°F86°F73°F6.1"
      July61°F86°F73°F7.8"
      August64°F85°F73°F9.2"
      September55°F82°F67°F3.9"
      October45°F69°F56°F1.9"
      November30°F52°F40°F4.2"
      December17°F31°F23°F1.5"

      Sterling 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.
      IndexSterlingIllinoisNational
      Air quality index424150
      Pollution index2,097,7403,347,2955,066,862

      Sterling air quality information

      MeasurementTotal
      Days measured364
      Days with good air quality268
      Days with moderate air quality96
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Sterling air quality information

      PollutantTotal
      Arsenic0.001%
      Benzene0.060%
      Carbon Tetrachloride0.000%
      Lead0.001%
      Mercury0.300%

      Average monthly Sterling temperature with heat index

      Sterling monthly precipitation with daily maximum

      Sterling monthly snow depth with daily maximum

      Sterling monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Chadwick, IL5814216%
      Grand Detour, IL4894216%
      Morrison, IL3,9924216%
      Rock Falls, IL9,1044216%
      Coleta, IL1964216%
      Sterling, IL15,0714216%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Clearlake, CA15,0703138%
      Cherryland, CA15,0664314%
      Otsego, MN15,065468%
      Hereford, TX15,0864412%
      Newton, IA15,0903922%
      Sterling, IL15,0714216%
      Source: The Sterling, 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.