TODAY MAY13
TEMPERATURE43
HUMIDITY68
PRESSURE30.18
WIND COND.330 14.8
  • 6847Thu
  • 7149Fri
  • 7351Sat
  • 7352Sun30%
  • 7454Mon30%
daynightWeather update from White Plains - Westchester County Airport at

Key findings

  • The highest monthly average temperature in Greenwich for July is 74.5 degrees
  • The lowest monthly average temperature in Greenwich for January is 30.4 degrees
  • The most monthly precipitation in Greenwich occurs in June with 5.1 inches
  • The air quality index in Greenwich is 14% better than the national average
  • The pollution index in Greenwich is 235% worse than the national average

Compare Greenwich, CT Weather

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      Greenwich 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°F39°F30°F3.0"
      February23°F40°F31°F2.6"
      March30°F49°F39°F3.5"
      April41°F62°F50°F4.2"
      May50°F71°F60°F4.2"
      June60°F79°F69°F5.1"
      July66°F84°F74°F4.4"
      August64°F82°F72°F4.2"
      September57°F77°F66°F4.3"
      October47°F65°F55°F5.1"
      November37°F54°F45°F3.1"
      December29°F44°F36°F4.5"

      Greenwich 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.
      IndexGreenwichConnecticutNational
      Air quality index434350
      Pollution index16,950,7007,127,5315,066,862

      Greenwich air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality262
      Days with moderate air quality82
      Days w/ poor A.Q. for sensitive groups18
      Days with unhealthy air quality3

      Greenwich air quality information

      PollutantTotal
      Arsenic0.030%
      Benzene0.140%
      Carbon Tetrachloride0.070%
      Lead0.080%
      Mercury0.030%

      Average monthly Greenwich temperature with heat index

      Greenwich monthly precipitation with daily maximum

      Greenwich monthly snow depth with daily maximum

      Greenwich monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Croton-on-Hudson, NY8,2093628%
      Glenville, CT2,3024314%
      Darien, CT21,5194314%
      Riverside, CT8,2894314%
      Armonk, NY4,3034314%
      Greenwich, CT13,4294314%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Piney Green, NC13,4273726%
      Waianae, HI13,4263040%
      Stony Brook, NY13,4374314%
      Brainerd, MN13,4402942%
      Hot Springs Village, AR13,4433824%
      Greenwich, CT13,4294314%
      Source: The Greenwich, 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.