TODAY DEC22
TEMPERATURE12
HUMIDITY
PRESSURE102270
WIND COND.320 18.4
  • 229
  • 2823Mon20%
  • 3926Tue50%20%
  • 3929
  • 4129Thu
daynightWeather update from Otis Air National Guard Base at
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Weather Quick Facts

  • The highest monthly average temperature in Onset for July is 71.5 degrees
  • The lowest monthly average temperature in Onset for February is 30.1 degrees
  • The most monthly precipitation in Onset occurs in September with 14.3 inches
  • The air quality index in Onset is 14% better than the national average
  • The pollution index in Onset is 257% worse than the national average

Compare Onset, MA Weather

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      Onset 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
      January24°F39°F31°F6.8"
      February23°F39°F30°F6.4"
      March29°F46°F37°F7.5"
      April38°F56°F47°F9.7"
      May48°F65°F56°F6.2"
      June58°F73°F65°F8.0"
      July64°F79°F72°F9.7"
      August62°F77°F69°F9.2"
      September55°F70°F62°F14.3"
      October45°F61°F53°F4.9"
      November38°F52°F45°F10.3"
      December28°F44°F36°F7.1"

      Onset 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.
      IndexOnsetMassachusettsNational
      Air quality index364042
      Pollution index9,737,6208,399,6102,726,193

      Onset air quality

      MeasurementTotal
      Days measured359
      Days with good air quality348
      Days with moderate air quality11
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.180%
      Benzene0.070%
      Carbon Tetrachloride0.040%
      Lead0.170%
      Mercury0.140%

      Average monthly Onset temperature with heat index

      Onset monthly precipitation with daily maximum

      Onset monthly snow depth with daily maximum

      Onset monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Marion Center, MA1,0613628.0%
      Pocasset, MA2,5963628.0%
      Seconsett Island, MA373628.0%
      West Wareham, MA2,3983628.0%
      Bourne, MA1,3773628.0%
      Onset, MA1,0493628.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Skyline, AL1,0494412.0%
      Herald, CA1,0494510.0%
      Saybrook Manor, CT1,0493726.0%
      Canon, GA1,0494118.0%
      Tyrone, OK1,0491570.0%
      Onset, MA1,0493628.0%
      Source: The Onset, 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.