TODAY AUG21
TEMPERATURE72
HUMIDITY69
PRESSURE30.18
WIND COND.360 11.4
  • 8365Sat
  • 8162Sun40%60%
  • 7456Mon70%40%
  • 7754Tue
  • 7959Wed
daynightWeather update from Orange City 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
January12°F30°F21°F0.8"
February14°F34°F23°F1.0"
March28°F49°F37°F2.2"
April39°F63°F49°F4.1"
May49°F73°F60°F5.2"
June60°F83°F71°F7.1"
July64°F86°F75°F4.2"
August62°F83°F71°F5.5"
September53°F77°F63°F2.8"
October41°F64°F51°F4.0"
November28°F49°F38°F3.7"
December16°F33°F24°F2.5"

Did you know?

  • The highest monthly average temperature in Alton for July is 75 degrees.
  • The lowest monthly average temperature in Alton for January is 21 degrees.
  • The most monthly precipitation in Alton occurs in June with 7.1 inches.
  • The air quality index in Alton is 17% better than the national average.
  • The pollution index in Alton is 82% better than the national average.

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Compare Alton, IA 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.
IndexAltonIowaNational
Air quality index413950
Pollution index890,0791,643,8365,066,862

Alton air quality information

MeasurementTotal
Days measured365
Days with good air quality254
Days with moderate air quality110
Days w/ poor A.Q. for sensitive groups1
Days with unhealthy air quality

Alton air quality information

PollutantTotal
Arsenic0.000%
Benzene0.010%
Carbon Tetrachloride0.002%
Lead0.004%
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.
Boyden, IA7944020%
Hull, IA2,1464020%
Sheldon, IA5,0154020%
Rock Valley, IA3,6234020%
Orange City, IA6,1534118%
Alton, IA1,3254118%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Shoemakersville, PA1,3254510%
Ransom Canyon, TX1,3252648%
Vance, AL1,3253040%
Vardaman, MS1,3253530%
Griggsville, IL1,3253432%
Alton, IA1,3254118%
Source: The Alton, IA 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.