TODAY FEB25
TEMPERATURE45
HUMIDITY64
PRESSURE30.16
WIND COND.360 24.1
  • 4829Thu
  • 5042Fri30%
  • 5946Sat40%40%
  • 6138Sun60%50%
  • 5128Mon40%20%
daynightWeather update from Fort Knox at

Key findings

  • The highest monthly average temperature in Alton for July is 77 degrees
  • The lowest monthly average temperature in Alton for January is 34 degrees
  • The most monthly precipitation in Alton occurs in May with 8.8 inches
  • The air quality index in Alton is 88% better than the national average
  • The pollution index in Alton is 89% better than the national average

Compare Alton, IN 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
      January26°F44°F34°F5.7"
      February27°F46°F36°F5.3"
      March38°F59°F48°F7.5"
      April47°F71°F58°F8.0"
      May56°F77°F66°F8.8"
      June64°F86°F74°F6.4"
      July67°F87°F77°F8.3"
      August66°F87°F76°F6.3"
      September59°F81°F69°F8.4"
      October47°F70°F58°F8.6"
      November37°F58°F47°F5.9"
      December30°F48°F38°F7.8"

      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.
      IndexAltonIndianaNational
      Air quality index65650
      Pollution index547,3153,773,6185,066,862

      Alton air quality information

      MeasurementTotal
      Days measured272
      Days with good air quality254
      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

      City, StatePopulationAir Quality IndexNational Avg.
      Leavenworth, IN306688%
      Mauckport, IN623922%
      Brandenburg, KY2,8703922%
      Ekron, KY2143922%
      New Amsterdam, IN16492%
      Alton, IN37688%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Carbon, IA374020%
      Green Hills, PA373922%
      Norcross, MN373334%
      Ocean Beach, NY374314%
      Hassell, NC373824%
      Alton, IN37688%
      Source: The Alton, IN 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.