TODAY APR25
TEMPERATURE61
HUMIDITY52
PRESSURE102100
WIND COND.70 9.4
  • 7765Fri50%40%
  • 8066Sat40%40%
  • 8163Sun40%
  • 7159Mon
  • 7961Tue
daynightWeather update from Southern Illinois Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Alto Pass for August is 79.7 degrees
  • The lowest monthly average temperature in Alto Pass for February is 35.9 degrees
  • The most monthly precipitation in Alto Pass occurs in November with 11.1 inches
  • The air quality index in Alto Pass is 5% worse than the national average
  • The pollution index in Alto Pass is 14% better than the national average

Compare Alto Pass, IL Weather

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      Alto Pass 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
      January30°F44°F36°F7.5"
      February28°F46°F36°F4.9"
      March38°F61°F49°F4.2"
      April45°F67°F56°F5.8"
      May55°F79°F67°F4.4"
      June65°F87°F76°F5.4"
      July66°F87°F76°F3.6"
      August69°F92°F80°F3.8"
      September60°F85°F71°F5.0"
      October48°F73°F59°F5.5"
      November38°F59°F48°F11.1"
      December28°F45°F36°F6.7"

      Alto Pass 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.
      IndexAlto PassIllinoisNational
      Air quality index444142
      Pollution index2,331,2203,148,6942,726,193

      Alto Pass air quality information

      MeasurementTotal
      Days measured364
      Days with good air quality261
      Days with moderate air quality103
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Alto Pass air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.030%
      Carbon Tetrachloride0.004%
      Lead0.002%
      Mercury0.260%

      Average monthly Alto Pass temperature with heat index

      Alto Pass monthly precipitation with daily maximum

      Alto Pass monthly snow depth with daily maximum

      Alto Pass monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Cambria, IL1,0714314.0%
      Gorham, IL2634314.0%
      Altenburg, MO3454314.0%
      Carbondale, IL25,4004314.0%
      Murphysboro, IL7,7274314.0%
      Alto Pass, IL3424412.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Montrose, GA3423824.0%
      Oliver, GA3423922.0%
      Persia, IA3424020.0%
      Williamsburg, KS3422256.0%
      Brownsboro Village, KY342492.0%
      Alto Pass, IL3424412.0%
      Source: The Alto Pass, 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.