TODAY MAY28
TEMPERATURE64
HUMIDITY100
PRESSURE100810
WIND COND.80 13
  • 7956Tue30%
  • 7252Wed40%
  • 6849Thu40%50%
  • 7048Fri
  • 7550Sat
daynightWeather update from Laconia, Laconia Municipal Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Alton for August is 69.7 degrees
  • The lowest monthly average temperature in Alton for February is 20.8 degrees
  • The most monthly precipitation in Alton occurs in October with 14.4 inches
  • The air quality index in Alton is 26% better than the national average
  • The pollution index in Alton is 52% worse than the national average

Compare Alton, NH 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
      January14°F32°F22°F1.7"
      February12°F32°F21°F3.0"
      March21°F42°F30°F4.7"
      April34°F56°F43°F7.1"
      May44°F65°F53°F4.1"
      June57°F78°F66°F7.3"
      July61°F81°F70°F4.3"
      August60°F83°F70°F4.3"
      September55°F75°F64°F6.0"
      October46°F62°F53°F14.4"
      November31°F47°F38°F7.1"
      December18°F34°F25°F3.8"

      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.
      IndexAltonNew HampshireNational
      Air quality index313442
      Pollution index4,139,3203,959,6182,726,193

      Alton air quality information

      MeasurementTotal
      Days measured316
      Days with good air quality308
      Days with moderate air quality8
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Alton air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.060%
      Carbon Tetrachloride0.010%
      Lead0.020%
      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

      CityPopulationAir Quality IndexNational Avg.
      Pittsfield, NH1,4642746.0%
      Loudon, NH8302746.0%
      Rochester, NH31,3052746.0%
      Farmington, NH4,1403138.0%
      Laconia, NH16,5843138.0%
      Alton, NH1703138.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      White Mountain, AK1703824.0%
      Palominas, AZ1704510.0%
      Santa Claus, GA1702648.0%
      Haverhill, IA1703726.0%
      Webster, IA1703530.0%
      Alton, NH1703138.0%
      Source: The Alton, NH 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.