Port Jefferson, NY Weather - Forecast & Monthly Averages

TEMPERATURE	62
HUMIDITY	90
PRESSURE	101690
WIND COND.	290 9.4

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Weather Quick Facts

The highest monthly average temperature in Port Jefferson for July is 75.9 degrees
The lowest monthly average temperature in Port Jefferson for January is 32.3 degrees
The most monthly precipitation in Port Jefferson occurs in August with 5.6 inches
The air quality index in Port Jefferson is 2% worse than the national average
The pollution index in Port Jefferson is 1338% worse than the national average

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Port Jefferson 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	24°F	41°F	32°F	4.0"
February	24°F	43°F	33°F	3.0"
March	31°F	50°F	40°F	4.2"
April	41°F	61°F	50°F	3.5"
May	51°F	71°F	60°F	3.6"
June	60°F	79°F	69°F	4.7"
July	68°F	85°F	76°F	3.1"
August	65°F	83°F	74°F	5.6"
September	60°F	78°F	68°F	3.1"
October	49°F	67°F	58°F	4.1"
November	37°F	56°F	46°F	3.0"
December	31°F	47°F	39°F	4.9"

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Port Jefferson 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	Port Jefferson	New York	National
Air quality index	43	43	42
Pollution index	39,208,800	6,179,275	2,726,193

Port Jefferson 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	0.060%
Benzene	0.320%
Carbon Tetrachloride	0.020%
Lead	0.320%
Mercury	0.130%

Average monthly Port Jefferson temperature with heat index

Port Jefferson monthly precipitation with daily maximum

Port Jefferson monthly snow depth with daily maximum

Port Jefferson monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Calverton, NY	5,280	41	18.0%
Southport, CT	1,710	43	14.0%
Blue Point, NY	4,739	43	14.0%
Dix Hills, NY	23,995	43	14.0%
North Patchogue, NY	8,202	43	14.0%
Port Jefferson, NY	8,016	43	14.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Franklin, VA	8,015	40	20.0%
Downingtown, PA	8,012	42	16.0%
Stone Mills, ON	8,012	n/a
Jefferson, WI	8,011	37	26.0%
Whitmore Lake, MI	8,010	40	20.0%
Port Jefferson, NY	8,016	43	14.0%

Source: The Port Jefferson, NY 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.