TODAY NOV21
TEMPERATURE31
HUMIDITY82
PRESSURE30.24
WIND COND.210 6.9
  • 4328Wed
  • 4936
  • 4942Fri90%
  • 5340Sat
  • 5237Sun
daynightWeather update from Logan County Airport at

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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"

Did you know?

  • The highest monthly average temperature in Mason City for July is 76 degrees.
  • The lowest monthly average temperature in Mason City for January is 28 degrees.
  • The most monthly precipitation in Mason City occurs in September with 11.5 inches.
  • The air quality index in Mason City is 29% better than the national average.
  • The pollution index in Mason City is 74% better than the national average.

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Compare Mason City, IL Weather To Other Cities

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 index354150
Pollution index1,277,8903,347,2955,066,862

Mason City air quality information

MeasurementTotal
Days measured365
Days with good air quality316
Days with moderate air quality49
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

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, IL3763530%
Middletown, IL3233530%
Elkhart, IL4073530%
New Holland, IL1873530%
Broadwell, IL1523530%
Mason City, IL2,2723530%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Oak Hills, PA2,2723138%
Point Clear, AL2,2723432%
South Congaree, SC2,2724216%
Jamestown West, NY2,2723334%
Village of Four Seasons, MO2,2723726%
Mason City, IL2,2723530%
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.