TODAY OCT03
TEMPERATURE44
HUMIDITY82
PRESSURE101630
WIND COND.20 13
  • 7147Fri
  • 8451Sat
  • 6939Sun
  • 7239Mon
  • 7644Tue
daynightWeather update from Mason City Municipal Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Mason City for July is 72.5 degrees
  • The lowest monthly average temperature in Mason City for January is 16.7 degrees
  • The most monthly precipitation in Mason City occurs in June with 5.4 inches
  • The air quality index in Mason City is 64% better than the national average
  • The pollution index in Mason City is 63% better than the national average

Compare Mason City, IA 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
      January9°F25°F17°F0.7"
      February11°F29°F20°F1.1"
      March25°F44°F34°F2.2"
      April36°F60°F47°F5.1"
      May48°F71°F59°F5.0"
      June58°F81°F69°F5.4"
      July61°F84°F72°F4.2"
      August59°F82°F70°F4.0"
      September51°F76°F62°F4.3"
      October38°F62°F49°F2.7"
      November26°F47°F36°F1.5"
      December13°F29°F21°F1.4"

      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 CityIowaNational
      Air quality index153942
      Pollution index1,013,9601,154,5352,726,193

      Mason City air quality

      MeasurementTotal
      Days measured118
      Days with good air quality118
      Days with moderate air quality0
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.000%
      Benzene0.010%
      Carbon Tetrachloride0.001%
      Lead0.001%
      Mercury0.000%

      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

      CityPopulationAir Quality IndexNational Avg.
      Ventura, IA7611570.0%
      Plymouth, IA4661570.0%
      Rockford, IA8271570.0%
      Hanlontown, IA1911570.0%
      Grafton, IA1801570.0%
      Mason City, IA27,0641570.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Sainte-Thérèse, QC27,055n/a 
      Wheeling, WV27,0463922.0%
      Lincoln, ON27,082n/a 
      Clarence-Rockland, ON27,082n/a 
      Wakefield, MA27,0414314.0%
      Mason City, IA27,0641570.0%
      Source: The Mason City, IA 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.