TODAY OCT18
TEMPERATURE40
HUMIDITY82
PRESSURE30.5
WIND COND.
  • 6041Thu
  • 5647Fri20%30%
  • 6131Sat
  • 5336Sun
  • 6441Mon
daynightWeather update from St. Louis Regional Airport at
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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
January24°F41°F31°F3.4"
February25°F43°F33°F3.7"
March38°F57°F46°F3.1"
April47°F68°F56°F6.6"
May56°F76°F65°F6.1"
June65°F85°F75°F3.5"
July67°F87°F77°F7.3"
August66°F86°F75°F6.8"
September58°F80°F68°F4.4"
October47°F68°F57°F6.7"
November36°F56°F45°F4.9"
December28°F43°F35°F6.3"

Did you know?

  • The highest monthly average temperature in Alton for July is 77 degrees.
  • The lowest monthly average temperature in Alton for January is 31 degrees.
  • The most monthly precipitation in Alton occurs in July with 7.3 inches.
  • The air quality index in Alton is 20% worse than the national average.
  • The pollution index in Alton is 67% worse than the national average.

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Compare Alton, IL Weather To Other Cities

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.
IndexAltonIllinoisNational
Air quality index604150
Pollution index8,473,0503,347,2955,066,862

Alton air quality information

MeasurementTotal
Days measured365
Days with good air quality99
Days with moderate air quality231
Days w/ poor A.Q. for sensitive groups33
Days with unhealthy air quality2

Alton air quality information

PollutantTotal
Arsenic0.020%
Benzene0.070%
Carbon Tetrachloride0.020%
Lead0.010%
Mercury0.010%

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.
Brighton, IL2,3166020%
Edwardsville, IL25,0446020%
Grafton, IL6886020%
Jerseyville, IL8,5026020%
Pontoon Beach, IL5,7536020%
Alton, IL27,1756020%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Thomasville, NC27,1784020%
Isla Vista, CA27,1794412%
Imperial Beach, CA27,1806122%
Anderson, SC27,2063138%
New London, CT27,2184412%
Alton, IL27,1756020%
Source: The Alton, 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.