TODAY MAY16
TEMPERATURE71
HUMIDITY
PRESSURE30.14
WIND COND.130 13
  • 7059Mon70%70%
  • 7262Tue50%50%
  • 8266Wed30%30%
  • 8265Thu30%30%
  • 8465Fri
daynightWeather update from Logan County Airport at

Key findings

  • The highest monthly average temperature in Mason City for July is 75.7 degrees
  • The lowest monthly average temperature in Mason City for January is 27.8 degrees
  • The most monthly precipitation in Mason City occurs in September with 11.5 inches
  • The air quality index in Mason City is 20% better than the national average
  • The pollution index in Mason City is 75% better than the national average

Compare Mason City, IL Weather

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      Mason 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
      January20°F37°F28°F2.6"
      February21°F39°F29°F3.2"
      March34°F55°F43°F4.1"
      April44°F67°F55°F6.7"
      May54°F76°F65°F4.6"
      June63°F85°F74°F8.5"
      July66°F87°F76°F11.2"
      August64°F86°F74°F8.1"
      September56°F80°F67°F11.5"
      October46°F68°F56°F6.3"
      November34°F54°F43°F5.1"
      December25°F40°F32°F5.3"

      Mason 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.
      IndexMason CityIllinoisNational
      Air quality index404150
      Pollution index1,277,8903,347,2955,066,862

      Mason City air quality information

      MeasurementTotal
      Days measured360
      Days with good air quality287
      Days with moderate air quality73
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Mason City air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.050%
      Carbon Tetrachloride0.000%
      Lead0.010%
      Mercury0.002%

      Average monthly Mason City temperature with heat index

      Mason City monthly precipitation with daily maximum

      Mason City monthly snow depth with daily maximum

      Mason City monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Easton, IL3764020%
      Middletown, IL3234020%
      New Holland, IL1874020%
      Elkhart, IL4074020%
      Greenview, IL8444020%
      Mason City, IL2,2724020%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      South Congaree, SC2,2724314%
      Decatur, AR2,2724412%
      Point Clear, AL2,2723726%
      Jamestown West, NY2,2723726%
      Arcanum, OH2,272688%
      Mason City, IL2,2724020%
      Source: The Mason 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.