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Cos Cob, Connecticut

Community in Fairfield County, Connecticut

Air quality

The air at Cos Cob

Index 25, good, led by ozone. Read at 11 PM from its reporting area, New York City Region (NY), 19 miles off.

25Good
  • Fine particles (PM2.5)17Good8.6 mi
  • Ozone25Good12 ppb8.6 mi
  • Coarse particles (PM10)-22.7 mi
  • Nitrogen dioxide1Good1.3 ppb14.5 mi
  • Sulfur dioxide0Good0 ppb22.7 mi
  • Carbon monoxide-0.1 ppm23.4 mi

The days ahead

Good each day through Today, led by fine particles. Yesterday measured 58, moderate.

Smoke, the next 45 hours

Little smoke near the ground through Sat 8 PM: the index from smoke stays at 6 or under.

FriSat

Precipitation

What has fallen at Cos Cob

None in the last 3 days, to Thu 11 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.00in

Visibility

How far you can see at Cos Cob, the next 45 hours

Mist or haze: visibility falls to 2 miles Fri 8 PM.

FriSat

On the radar over Cos Cob, ConnecticutReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Cos Cob, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.3 miles away.

measured now4 instruments

measured daily2 instruments

Cos Cob 0.9 NNECT-FR-80

In a volunteer observer's own ground/0.3 mi away/34 ft/2 ft below here

precip, snowfall, snow depth

Rank-

GreenwichGREC3

At a cooperative observer's station/3.4 mi away/361 ft/325 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Danbury Municipal, drawn

The nearest airport reporting now, 23.2 mi from Cos Cob, Connecticut. From its report of Oct 15, 2026, 11:53 PM local time: 3 of its 6 sheets.

The sky

A few clouds at 7,500 ft; visibility 10 mi or more.

Section of the sky over Danbury Municipal, height above the station to scale: a few clouds cloud with its base at 7,500 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DXRFIG. A THE SKY OVER DANBURY MUNICIPALSECTION, HEIGHT ABOVE THE STATION TO SCALE, EACH LAYER AT THE HEIGHT OF ITS BASE AS REPORTED; COVER IN EIGHTHS OF THE SKY; TOPS NOT MEASUREDFT ABOVE THE STATION02,5005,0007,50010,00012,500ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FTFEW 7,500 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYVISIBILITY, MILES: 10 MI OR MORE0510TITLEDanbury Municipal, the skySTATION REPORT · ASOS DXRTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-DXR-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-013, FB-SKY-014

The air

52.0 F with a dew point of 48.0 F, 86 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 900 ft up; the lowest cloud reported is at 7,500 ft.

Chart of the air at Danbury Municipal: temperature 52.0 degrees Fahrenheit and dew point 48.0, 86 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 900 feet above the station, against the lowest cloud reported at 7,500 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DXRFIG. B THE AIR AT DANBURY MUNICIPALTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,00040 F50 F60 FSATURATES 900 FT ABOVE THE STATION, AT 47.1 FABOVE THIS SHEET: LOWEST CLOUD REPORTED, FEW 7,500 FTTEMPERATURE 52.0 FDEW POINT 48.0 FSPREAD 4.0 FRELATIVE HUMIDITY 86 PER CENTTHE AIR COOLS ABOUT 5.4 F EACH 1,000 FT IT RISES, AND ITS DEW POINT ABOUT 1 FSOLID: THE LIFTED AIR'S TEMPERATURE; DASHED: ITS DEW POINTTITLEDanbury Municipal, the airSTATION REPORT · ASOS DXRTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-DXR-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Danbury Municipal, north up: calm; beside it the Beaufort scale from calm to hurricane force, force 0, calm, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DXRFIG. C THE WIND AT DANBURY MUNICIPALPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONCALMBEAUFORT FORCELEAST WIND, MPH0CALM0NOW, 0 MPH1LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEDanbury Municipal, the windSTATION REPORT · ASOS DXRTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-DXR-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Danbury Municipal, in 6 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in Connecticut

20 places, each with its own forecast and its own instruments.

Near Cos Cob

The nearest places, each with its own forecast and the instruments nearest it.

Near Cos Cob

River and lake gauges