TODAY AUG14
TEMPERATURE70
HUMIDITY97
PRESSURE29.92
WIND COND.70 4.7
  • 8771Wed20%
  • 8770Thu
  • 8573Fri40%
  • 8367Sat40%
  • 7765Sun
daynightWeather update from Boston, Logan International Airport at

Chelsea 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
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"

Did you know?

  • The highest monthly average temperature in Chelsea for July is 74 degrees.
  • The lowest monthly average temperature in Chelsea for January is 31 degrees.
  • The most monthly precipitation in Chelsea occurs in October with 5 inches.
  • The air quality index in Chelsea is 5% better than the national average.
  • The pollution index in Chelsea is 374% worse than the national average.

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Compare Chelsea, MA Weather To Other Cities

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 index474050
Pollution index24,018,00012,377,8395,066,862

Chelsea air quality information

MeasurementTotal
Days measured365
Days with good air quality223
Days with moderate air quality137
Days w/ poor A.Q. for sensitive groups5
Days with unhealthy air quality

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

City, StatePopulationAir Quality IndexNational Avg.
Beverly, MA40,967476%
Burlington, MA25,698476%
Dover, MA2,453476%
Hull, MA10,437476%
Malden, MA60,732476%
Chelsea, MA38,244476%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Florence, SC38,2214020%
Friendswood, TX38,272524%
Carpentersville, IL38,2756020%
Montclair, CA38,2948570%
Hanover Park, IL38,3316020%
Chelsea, MA38,244476%
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.