TODAY AUG20
TEMPERATURE73
HUMIDITY100
PRESSURE29.95
WIND COND.90 3.4
  • 8269Mon60%60%
  • 7963Tue50%40%
  • 7856Wed
  • 7957Thu
  • 8367Fri
daynightWeather update from Fort Knox at

Alton Average Weather

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"

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 34 degrees.
  • The most monthly precipitation in Alton occurs in May with 8.8 inches.
  • The air quality index in Alton is 77% better than the national average.
  • The pollution index in Alton is 89% better than the national average.

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Compare Alton, IN 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.
IndexAltonIndianaNational
Air quality index115650
Pollution index547,3153,773,6185,066,862

Alton air quality information

MeasurementTotal
Days measured365
Days with good air quality276
Days with moderate air quality69
Days w/ poor A.Q. for sensitive groups18
Days with unhealthy air quality2

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, IN3061178%
Brandenburg, KY2,8704314%
Ekron, KY2144314%
Mauckport, IN624314%
New Amsterdam, IN165510%
Alton, IN371178%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Norcross, MN373530%
Udell, IA374118%
Paradise, KS37688%
Green Hills, PA37476%
Ocean Beach, NY37476%
Alton, IN371178%
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.