TODAY AUG19
TEMPERATURE73
HUMIDITY90
PRESSURE29.81
WIND COND.330 13.9
  • 7663Sun30%20%
  • 7864Mon
  • 7868Tue50%
  • 8665Wed50%30%
  • 8161Thu
daynightWeather update from White Plains - Westchester County Airport at

Old Greenwich 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°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"

Did you know?

  • The highest monthly average temperature in Old Greenwich for July is 74 degrees.
  • The lowest monthly average temperature in Old Greenwich for January is 30 degrees.
  • The most monthly precipitation in Old Greenwich occurs in June with 5.1 inches.
  • The air quality index in Old Greenwich is 5% better than the national average.
  • The pollution index in Old Greenwich is 234% worse than the national average.

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Compare Old Greenwich, CT Weather To Other Cities

Old 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.
IndexOld GreenwichConnecticutNational
Air quality index474350
Pollution index16,950,7007,127,5315,066,862

Old Greenwich air quality information

MeasurementTotal
Days measured365
Days with good air quality200
Days with moderate air quality146
Days w/ poor A.Q. for sensitive groups18
Days with unhealthy air quality1

Old Greenwich air quality information

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

Average monthly Old Greenwich temperature with heat index

Old Greenwich monthly precipitation with daily maximum

Old Greenwich monthly snow depth with daily maximum

Old Greenwich monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
South Huntington, NY9,508476%
Byram, CT4,487476%
Glenville, CT2,302476%
Riverside, CT8,289476%
Wilton Center, CT675476%
Old Greenwich, CT7,000476%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Russellville, KY6,9983824%
Pelham, NY6,996536%
Inwood, FL6,9953628%
Idabel, OK7,0073824%
Linwood, NJ7,0093628%
Old Greenwich, CT7,000476%
Source: The Old 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.