TODAY APR03
TEMPERATURE43
HUMIDITY97
PRESSURE29.54
WIND COND.360 6.9
  • 4436Fri90%40%
  • 4834Sat
  • 5338Sun
  • 5635Mon
  • 5536Tue
daynightWeather update from Laconia, Laconia Municipal Airport at
How would you rate the weather in Alton?
Write a review to give others more information about this area.
How would you rate the air quality in Alton?
Write a review to give others more information about this area.
See all Alton poll results

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"

Did you know?

  • The highest monthly average temperature in Alton for August is 70 degrees.
  • The lowest monthly average temperature in Alton for February is 21 degrees.
  • The most monthly precipitation in Alton occurs in October with 14.4 inches.
  • The air quality index in Alton is 42% better than the national average.
  • The pollution index in Alton is 18% better than the national average.

Compare Alton, NH Weather To Other Cities

      vs

      Alton air quality index & pollution index

      m->air_qu[$ndxs[0]]; $r1 =& $this->m->air_qu[$ndxs[1]]; $r0 =& $this->m->air_qu[$ndxs[2]]; echo ''; $r2 =& $this->m->air_po[$ndxs[0]]; $r1 =& $this->m->air_po[$ndxs[1]]; $r0 =& $this->m->air_po[$ndxs[2]]; echo ''; ?>
      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 index',number_format( $r2->med_aqi ),'',number_format( $r1->med_aqi ),'',number_format( $r0->med_aqi ),'
      Pollution index',number_format( $r2->sum188 ),'',number_format( $r1->sum188 ),'',number_format( $r0->sum188 ),'

      Alton air quality information

      MeasurementTotal
      Days measured214
      Days with good air quality209
      Days with moderate air quality5
      Days w/ poor A.Q. for sensitive groups
      Days with unhealthy air quality

      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

      City, StatePopulationAir Quality IndexNational Avg.
      Loudon, NH7822648%
      Pittsfield, NH1,6192648%
      Rochester, NH30,0522648%
      Farmington, NH4,1222942%
      Milton, NH8842942%
      Alton, NH2142942%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Fordville, ND2143530%
      Clifford, IN2143236%
      Edgefield, LA2144314%
      Samburg, TN2143628%
      Marquette, NE214265430%
      Alton, NH2142942%
      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.