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Lexington, Massachusetts

Community in Middlesex County, Massachusetts

Air quality

The air at Lexington

Index 18, good, led by fine particles. Read at 12 AM from its reporting area, Boston Metro (MA), 6 miles off.

18Good
  • Fine particles (PM2.5)18Good9.2 mi
  • Ozone10Good15 ppb10.7 mi
  • Coarse particles (PM10)6Good10.7 mi
  • Nitrogen dioxide15Good16 ppb9.2 mi
  • Sulfur dioxide1Good1.2 ppb9.2 mi
  • Carbon monoxide-0.2 ppm10.7 mi

The days ahead

Good each day through Sat Oct 17, led by fine particles. Yesterday measured 41, good.

Smoke, the next 44 hours

No smoke near the ground through Sat 8 PM.

FriSat

Precipitation

What has fallen at Lexington

None in the last 24 hours; 0.09 in over the last 3 days, to Fri 12 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.09in

Visibility

How far you can see at Lexington, the next 44 hours

Mist or haze: visibility falls to 2 miles Fri 9 AM.

FriSat

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

What is measuring near here

The 6 instruments nearest Lexington, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.7 miles away.

measured now4 instruments

measured daily2 instruments

Jamacia PlainJPBM3

At a cooperative observer's station/11.1 mi away/102 ft/115 ft below here

snowfall, snow depth, precip, high, low

Rank464of 744

Station report

The weather at Hanscom Fld/Bedford, drawn

The nearest airport reporting now, 3.7 mi from Lexington, Massachusetts. From its report of Oct 15, 2026, 11:51 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 Hanscom Fld/Bedford, 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 BEDFIG. A THE SKY OVER HANSCOM FLD/BEDFORDSECTION, 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 MORE0510TITLEHanscom Fld/Bedford, the skySTATION REPORT · ASOS BEDTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-BED-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

42.0 F with a dew point of 40.0 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 Hanscom Fld/Bedford: temperature 42.0 degrees Fahrenheit and dew point 40.0, 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 BEDFIG. B THE AIR AT HANSCOM FLD/BEDFORDTHE 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 39.5 FTEMPERATURE AND DEW POINT 42.0 F, 40.0 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 POINTTITLEHanscom Fld/Bedford, the airSTATION REPORT · ASOS BEDTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-BED-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 Hanscom Fld/Bedford, 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 BEDFIG. C THE WIND AT HANSCOM FLD/BEDFORDPLAN, 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 FORCE73TITLEHanscom Fld/Bedford, the windSTATION REPORT · ASOS BEDTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-BED-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

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Snow on the ground

Elsewhere in Massachusetts

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

Near Lexington

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

Near Lexington

River and lake gauges