TODAY MAR29
TEMPERATURE63
HUMIDITY87
PRESSURE101690
WIND COND.120 16.6
  • 8366
  • 8769Sat
  • 9571Sun
  • 10072Mon
  • 8860Tue
daynightWeather update from McAllen, Miller International Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Alton for August is 87 degrees
  • The lowest monthly average temperature in Alton for January is 61 degrees
  • The most monthly precipitation in Alton occurs in September with 4.6 inches
  • The air quality index in Alton is equal to the national average
  • The pollution index in Alton is 162% worse than the national average

Compare Alton, TX 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
      January51°F74°F61°F1.0"
      February56°F78°F65°F0.8"
      March62°F84°F71°F1.0"
      April68°F89°F77°F1.5"
      May73°F93°F81°F2.1"
      June77°F97°F85°F1.8"
      July78°F98°F86°F3.3"
      August78°F99°F87°F1.8"
      September75°F95°F83°F4.6"
      October68°F90°F78°F1.6"
      November60°F82°F70°F1.1"
      December54°F75°F63°F1.4"

      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.
      IndexAltonTexasNational
      Air quality index425242
      Pollution index7,136,5302,009,3002,726,193

      Alton air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality243
      Days with moderate air quality120
      Days w/ poor A.Q. for sensitive groups2
      Days with unhealthy air quality0

      Alton air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.080%
      Carbon Tetrachloride0.010%
      Lead0.020%
      Mercury0.001%

      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

      CityPopulationAir Quality IndexNational Avg.
      Campo Verde, TX1694216.0%
      Doffing, TX4,8644216.0%
      Pharr, TX78,6894216.0%
      North Alamo, TX3,9774216.0%
      Tierra Dorada, TX04216.0%
      Alton, TX17,6834216.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Knik-Fairview, AK17,6823138.0%
      Spanish Lake, MO17,682548.0%
      Maryland City, MD17,681468.0%
      Tallmadge, OH17,6814314.0%
      Laurel, VA17,6784412.0%
      Alton, TX17,6834216.0%
      Source: The Alton, TX 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.