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Key findings

  • The highest monthly average temperature in Groton for July is 72.2 degrees
  • The lowest monthly average temperature in Groton for January is 31.5 degrees
  • The most monthly precipitation in Groton occurs in October with 4.4 inches
  • The air quality index in Groton is 26% better than the national average
  • The pollution index in Groton is 51% worse than the national average

Compare Groton, CT Weather

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      Groton 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°F32°F2.5"
      February23°F40°F32°F2.1"
      March30°F47°F38°F3.3"
      April39°F58°F48°F3.1"
      May48°F66°F57°F3.6"
      June58°F75°F66°F3.6"
      July65°F81°F72°F2.8"
      August63°F80°F71°F3.0"
      September57°F75°F66°F3.3"
      October47°F65°F56°F4.4"
      November37°F55°F46°F2.9"
      December29°F46°F37°F3.4"

      Groton 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.
      IndexGrotonConnecticutNational
      Air quality index374350
      Pollution index4,117,2508,629,8832,726,193

      Groton air quality information

      MeasurementTotal
      Days measured364
      Days with good air quality323
      Days with moderate air quality34
      Days w/ poor A.Q. for sensitive groups7
      Days with unhealthy air quality0

      Groton air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.050%
      Carbon Tetrachloride0.010%
      Lead0.010%
      Mercury0.010%

      Average monthly Groton temperature with heat index

      Groton monthly precipitation with daily maximum

      Groton monthly snow depth with daily maximum

      Groton monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      East Marion, NY9113726.0%
      Conning Towers Nautilus Park, CT9,6063726.0%
      Ashaway, RI1,1113726.0%
      New London, CT27,2183726.0%
      Long Hill, CT4,4623726.0%
      Groton, CT9,2403726.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Economy, PA9,2405612.0%
      Brigantine, NJ9,2393726.0%
      Little River, SC9,2393432.0%
      East Rutherford, NJ9,236512.0%
      Midway City, CA9,2357244.0%
      Groton, CT9,2403726.0%
      Source: The Groton, CT 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.