TODAY MAR28
TEMPERATURE46
HUMIDITY100
PRESSURE101320
WIND COND.70 9.4
  • 5435Fri70%
  • 5136Sat
  • 5334Sun
  • 5338Mon
  • 4837Tue50%60%
daynightWeather update from Boston, Logan International Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Chelsea for July is 74.2 degrees
  • The lowest monthly average temperature in Chelsea for January is 30.7 degrees
  • The most monthly precipitation in Chelsea occurs in October with 5 inches
  • The air quality index in Chelsea is 2% worse than the national average
  • The pollution index in Chelsea is 781% worse than the national average

Compare Chelsea, MA Weather

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      Chelsea 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
      January23°F40°F31°F3.2"
      February22°F41°F31°F3.2"
      March29°F48°F38°F3.8"
      April40°F61°F49°F3.7"
      May50°F69°F58°F3.8"
      June59°F78°F67°F4.7"
      July66°F85°F74°F4.1"
      August64°F83°F73°F3.5"
      September58°F77°F66°F3.0"
      October48°F66°F56°F5.0"
      November37°F55°F45°F3.3"
      December28°F45°F36°F4.6"

      Chelsea 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.
      IndexChelseaMassachusettsNational
      Air quality index434042
      Pollution index24,018,0008,399,6102,726,193

      Chelsea air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality291
      Days with moderate air quality73
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Chelsea air quality information

      PollutantTotal
      Arsenic0.030%
      Benzene0.220%
      Carbon Tetrachloride0.100%
      Lead0.280%
      Mercury0.130%

      Average monthly Chelsea temperature with heat index

      Chelsea monthly precipitation with daily maximum

      Chelsea monthly snow depth with daily maximum

      Chelsea monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Dedham, MA25,3304314.0%
      Medfield, MA6,6684314.0%
      North Scituate, MA5,3724314.0%
      Weymouth Town, MA57,2134314.0%
      Swampscott, MA15,1844314.0%
      Chelsea, MA39,8784314.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      The Acreage, FL39,8633628.0%
      Friendswood, TX39,893524.0%
      Marion, IA39,9103922.0%
      Calexico, CA39,8415816.0%
      Streamwood, IL39,9175510.0%
      Chelsea, MA39,8784314.0%
      Source: The Chelsea, MA 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.