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Weather Quick Facts

  • The highest monthly average temperature in Alton for August is 80.3 degrees
  • The lowest monthly average temperature in Alton for January is 36.1 degrees
  • The most monthly precipitation in Alton occurs in July with 10.3 inches
  • The air quality index in Alton is 14% better than the national average
  • The pollution index in Alton is 89% better than the national average

Compare Alton, MO Weather

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      Alton 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
      January29°F46°F36°F7.4"
      February29°F50°F38°F6.4"
      March40°F63°F51°F2.9"
      April46°F67°F56°F7.0"
      May55°F78°F67°F4.1"
      June63°F86°F74°F4.4"
      July66°F88°F77°F10.3"
      August69°F93°F80°F7.0"
      September62°F84°F72°F10.2"
      October50°F71°F59°F4.8"
      November38°F60°F48°F9.4"
      December28°F46°F36°F5.9"

      Alton 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.
      IndexAltonMissouriNational
      Air quality index369742
      Pollution index305,3761,630,2552,726,193

      Alton air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality347
      Days with moderate air quality18
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Alton air quality information

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

      Average monthly Alton temperature with heat index

      Alton monthly precipitation with daily maximum

      Alton monthly snow depth with daily maximum

      Alton monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Mammoth Spring, AR1,1173628.0%
      Koshkonong, MO1533628.0%
      Thayer, MO2,5783628.0%
      Thomasville, MO03628.0%
      Alton, MO6383628.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Mountain Park city, GA638524.0%
      Elgin, IA6383922.0%
      Oretta, LA6384510.0%
      Lake Benton, MN6384216.0%
      Warner, NH6382746.0%
      Alton, MO6383628.0%
      Source: The Alton, MO 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.