Old Greenwich, CT Weather - Forecast & Monthly Averages

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TEMPERATURE
HUMIDITY
PRESSURE
WIND COND.

Weather Quick Facts

The highest monthly average temperature in Old Greenwich for July is 74.5 degrees
The lowest monthly average temperature in Old Greenwich for January is 30.4 degrees
The most monthly precipitation in Old Greenwich occurs in June with 5.1 inches
The air quality index in Old Greenwich is 2% worse than the national average
The pollution index in Old Greenwich is 522% worse than the national average

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Old Greenwich Average Temperature

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
Month	Temp. _(min)	Temp. _(max)	Temp. _(avg)	Precipitation
January	23°F	39°F	30°F	3.0"
February	23°F	40°F	31°F	2.6"
March	30°F	49°F	39°F	3.5"
April	41°F	62°F	50°F	4.2"
May	50°F	71°F	60°F	4.2"
June	60°F	79°F	69°F	5.1"
July	66°F	84°F	74°F	4.4"
August	64°F	82°F	72°F	4.2"
September	57°F	77°F	66°F	4.3"
October	47°F	65°F	55°F	5.1"
November	37°F	54°F	45°F	3.1"
December	29°F	44°F	36°F	4.5"

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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.
Index	Old Greenwich	Connecticut	National
Air quality index	43	43	42
Pollution index	16,950,700	8,629,883	2,726,193

Old Greenwich air quality

Measurement	Total
Days measured	365
Days with good air quality	262
Days with moderate air quality	82
Days w/ poor A.Q. for sensitive groups	18
Days with unhealthy air quality	3

Air quality details

Pollutant	Total
Arsenic	0.030%
Benzene	0.140%
Carbon Tetrachloride	0.070%
Lead	0.080%
Mercury	0.030%

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	Population	Air Quality Index	National Avg.
Cos Cob, CT	7,278	43	14.0%
Riverside, CT	9,108	43	14.0%
Wilton Center, CT	1,875	43	14.0%
Dix Hills, NY	24,498	43	14.0%
East Northport, NY	20,490	43	14.0%
Old Greenwich, CT	7,189	43	14.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Oakdale, NY	7,188	43	14.0%
Pelham, NY	7,190	51	2.0%
Pinehurst, MA	7,184	43	14.0%
Souderton, PA	7,184	42	16.0%
Huntingdon, PA	7,182	41	18.0%
Old Greenwich, CT	7,189	43	14.0%

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.