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Dennis, Massachusetts

Community in Barnstable County, Massachusetts

Air quality

The air at Dennis

Index 24, good, led by ozone. Read at 11 PM from its reporting area, Cape Cod and Islands (MA), 11 miles off.

24Good
  • Ozone24Good-

The days ahead

Good each day through Sat Oct 17, led by fine particles. Yesterday measured 43, good.

Smoke, the next 46 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 Dennis

None in the last 24 hours; 0.16 in over the last 3 days, to Thu 10 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.16in

Visibility

How far you can see at Dennis, the next 46 hours

Dense fog: visibility falls to 0.1 miles Fri 7 PM, under a mile for 5 hours.

FriSat

On the radar over Dennis, MassachusettsReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Dennis, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.9 miles away.

measured now4 instruments

SandwichSANM3

At a river or reservoir gauge/16.3 mi away/7 ft/88 ft below here

temp, wind, gust, humidity, pressure

Rank352of 744

measured daily2 instruments

Dennis 0.8 SMA-BA-107

In a volunteer observer's own ground/0.9 mi away/61 ft/34 ft below here

precip, snowfall, snow depth

Rank345of 744

Wpc FacilityHYSM3

At a cooperative observer's station/7.1 mi away/43 ft/52 ft below here

snowfall, snow depth, precip, high, low

Rank350of 744

Station report

The weather at Hyannis/Polando Fld, drawn

The nearest airport reporting now, 6.2 mi from Dennis, Massachusetts. From its report of Oct 15, 2026, 10:56 PM local time: 3 of its 6 sheets.

The sky

No cloud below 12,000 ft; visibility 10 mi or more.

Section of the sky over Hyannis/Polando Fld, height above the station to scale: no cloud detected below 12,000 feet, the reach of its ceilometer, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT HYAFIG. A THE SKY OVER HYANNIS/POLANDO FLDSECTION, 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 STATION05001,0001,5002,0002,5003,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETNO CLOUD DETECTED BELOW 12,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEHyannis/Polando Fld, the skySTATION REPORT · ASOS HYATYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-HYA-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

37.0 F with a dew point of 35.0 F, 92 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 500 ft up.

Chart of the air at Hyannis/Polando Fld: temperature 37.0 degrees Fahrenheit and dew point 35.0, 92 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 500 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT HYAFIG. B THE AIR AT HYANNIS/POLANDO FLDTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00020 F30 F40 F50 FSATURATES 500 FT ABOVE THE STATION, AT 34.6 FTEMPERATURE AND DEW POINT 37.0 F, 35.0 FRELATIVE HUMIDITY 92 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 POINTTITLEHyannis/Polando Fld, the airSTATION REPORT · ASOS HYATYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-HYA-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 Hyannis/Polando Fld, 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 HYAFIG. C THE WIND AT HYANNIS/POLANDO FLDPLAN, 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 FORCE73TITLEHyannis/Polando Fld, the windSTATION REPORT · ASOS HYATYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-HYA-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Hyannis/Polando Fld, in 6 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at Wpc Facility (HYSM3), 7.1 miles from here, read 15 Oct, 08:33. measured daily

Elsewhere in Massachusetts

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

Near Dennis

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

Near Dennis

River and lake gauges