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Hopkinton, Massachusetts

Community in Middlesex County, Massachusetts

Air quality

The air at Hopkinton

Index 18, good, led by ozone. Read at 12 AM from its reporting area, Norfolk (MA), 16 miles off.

18Good
  • Fine particles (PM2.5)16Good10.4 mi
  • Ozone18Good2 ppb10.4 mi
  • Coarse particles (PM10)-10.4 mi
  • Nitrogen dioxide18Good19 ppb14.2 mi
  • Sulfur dioxide0Good0.6 ppb14.2 mi
  • Carbon monoxide-0.5 ppm14.2 mi

The days ahead

Good each day through Sat Oct 17, led by fine particles. Yesterday measured 31, good.

Smoke, the next 45 hours

No smoke near the ground through Sat 8 PM.

FriSat

Precipitation

What has fallen at Hopkinton

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 Hopkinton, the next 45 hours

Mist or haze: visibility falls to 3 miles Fri 10 AM.

FriSat

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

What is measuring near here

The 6 instruments nearest Hopkinton, 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

Hopkinton 0.5 NMA-MD-223

In a volunteer observer's own ground/0.3 mi away/452 ft/7 ft below here

precip, snowfall, snow depth

Rank-

MilfordMILM3

At a cooperative observer's station/4.5 mi away/273 ft/186 ft below here

snowfall, snow depth, precip, high, low

Rank56of 744

Station report

The weather at Norwood Memorial, drawn

The nearest airport reporting now, 18.0 mi from Hopkinton, Massachusetts. From its report of Oct 15, 2026, 11:53 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 Norwood Memorial, 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 OWDFIG. A THE SKY OVER NORWOOD MEMORIALSECTION, 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 MORE0510TITLENorwood Memorial, the skySTATION REPORT · ASOS OWDTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-OWD-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

43.0 F with a dew point of 41.0 F, 93 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 Norwood Memorial: temperature 43.0 degrees Fahrenheit and dew point 41.0, 93 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 OWDFIG. B THE AIR AT NORWOOD MEMORIALTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00030 F40 F50 FSATURATES 500 FT ABOVE THE STATION, AT 40.5 FTEMPERATURE AND DEW POINT 43.0 F, 41.0 FRELATIVE HUMIDITY 93 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 POINTTITLENorwood Memorial, the airSTATION REPORT · ASOS OWDTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-OWD-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 Norwood Memorial, 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 OWDFIG. C THE WIND AT NORWOOD MEMORIALPLAN, 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 FORCE73TITLENorwood Memorial, the windSTATION REPORT · ASOS OWDTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-OWD-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Milford (MILM3), 4.5 miles from here, read 15 Oct, 07:00. measured daily

Elsewhere in Massachusetts

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

Near Hopkinton

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

Near Hopkinton

River and lake gauges