TODAY MAY06
TEMPERATURE49
HUMIDITY71
PRESSURE30.22
WIND COND.360 25.9
  • 6439Fri
  • 6043Sat70%
  • 5738Sun60%30%
  • 6038Mon
  • 6342Tue
daynightWeather update from Marshalltown, Marshalltown Municipal Airport at

Key findings

  • The highest monthly average temperature in Marshalltown for July is 73.6 degrees
  • The lowest monthly average temperature in Marshalltown for January is 19.9 degrees
  • The most monthly precipitation in Marshalltown occurs in May with 5.8 inches
  • The air quality index in Marshalltown is 26% better than the national average
  • The pollution index in Marshalltown is 89% better than the national average

Compare Marshalltown, IA Weather

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      Marshalltown 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
      January12°F29°F20°F0.6"
      February13°F32°F22°F0.8"
      March28°F48°F37°F1.7"
      April39°F62°F49°F4.8"
      May50°F73°F61°F5.8"
      June60°F82°F71°F5.1"
      July63°F84°F74°F4.0"
      August61°F82°F71°F4.9"
      September52°F77°F64°F3.9"
      October41°F63°F51°F2.9"
      November29°F49°F38°F1.5"
      December16°F33°F24°F1.4"

      Marshalltown 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.
      IndexMarshalltownIowaNational
      Air quality index373950
      Pollution index534,7301,643,8365,066,862

      Marshalltown air quality information

      MeasurementTotal
      Days measured214
      Days with good air quality210
      Days with moderate air quality4
      Days w/ poor A.Q. for sensitive groups
      Days with unhealthy air quality

      Marshalltown air quality information

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

      Average monthly Marshalltown temperature with heat index

      Marshalltown monthly precipitation with daily maximum

      Marshalltown monthly snow depth with daily maximum

      Marshalltown monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Clemons, IA1113726%
      Ferguson, IA1373726%
      Liscomb, IA2913726%
      Melbourne, IA8213726%
      Albion, IA5733726%
      Marshalltown, IA27,6373726%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Garner, NC27,625468%
      Kirkwood, MO27,614548%
      Crofton, MD27,663476%
      Forest Hills, MI27,6673824%
      Maywood, CA27,6727244%
      Marshalltown, IA27,6373726%
      Source: The Marshalltown, 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.