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Key findings

  • The highest monthly average temperature in South Dennis for August is 71.3 degrees
  • The lowest monthly average temperature in South Dennis for February is 29.4 degrees
  • The most monthly precipitation in South Dennis occurs in March with 9.7 inches
  • The air quality index in South Dennis is 28% better than the national average
  • The pollution index in South Dennis is 190% worse than the national average

Compare South Dennis, MA Weather

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      South Dennis 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
      January25°F40°F31°F7.2"
      February22°F38°F29°F3.1"
      March27°F44°F35°F9.7"
      April36°F54°F45°F8.7"
      May46°F62°F53°F6.7"
      June57°F73°F64°F1.9"
      July64°F79°F71°F5.2"
      August63°F81°F71°F3.1"
      September57°F75°F66°F9.5"
      October48°F65°F56°F7.3"
      November36°F54°F45°F5.9"
      December27°F42°F34°F5.5"

      South Dennis 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.
      IndexSouth DennisMassachusettsNational
      Air quality index364050
      Pollution index7,903,8308,399,6102,726,193

      South Dennis air quality information

      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

      South Dennis air quality information

      PollutantTotal
      Arsenic0.060%
      Benzene0.070%
      Carbon Tetrachloride0.010%
      Lead0.080%
      Mercury0.030%

      Average monthly South Dennis temperature with heat index

      South Dennis monthly precipitation with daily maximum

      South Dennis monthly snow depth with daily maximum

      South Dennis monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Orleans, MA1,9373628.0%
      Brewster, MA2,0883628.0%
      East Harwich, MA4,9793628.0%
      Northwest Harwich, MA4,0443628.0%
      West Dennis, MA2,4743628.0%
      South Dennis, MA3,5823628.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Felton, CA3,5823530.0%
      Mission Hills, KS3,582476.0%
      Escatawpa, MS3,5823236.0%
      Haskell, TX3,5812648.0%
      Clifton, AZ3,5833726.0%
      South Dennis, MA3,5823628.0%
      Source: The South Dennis, 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.