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Groton, Massachusetts

Community in Middlesex County, Massachusetts

Air quality

The air at Groton

Index 27, good, led by fine particles. Read at 1 AM from its reporting area, West Middlesex (MA), 10 miles off.

27Good
  • Fine particles (PM2.5)27Good19.9 mi
  • Ozone1Good0 ppb10.6 mi
  • Coarse particles (PM10)-19.9 mi
  • Nitrogen dioxide4Good4.1 ppb19.9 mi
  • Sulfur dioxide0Good0.8 ppb19.9 mi
  • Carbon monoxide-0.2 ppm19.9 mi

The days ahead

Good each day through Sat Oct 17, led by fine particles. Yesterday measured 14, good.

Smoke, the next 43 hours

No smoke near the ground through Sat 8 PM.

FriSat

Precipitation

What has fallen at Groton

None in the last 24 hours; 0.31 in over the last 3 days, to Fri 1 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.31in

Visibility

How far you can see at Groton, the next 43 hours

Mist or haze: visibility falls to 1 miles Fri 10 AM.

FriSat

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

What is measuring near here

The 6 instruments nearest Groton, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.6 miles away.

measured now4 instruments

FitchburgFIT

At an airfield/10.1 mi away/348 ft/26 ft above here

temp, wind, gust, visibility, precip, pressure

Rank145of 744

measured daily2 instruments

Pepperell 2.2 SSWMA-MD-189

In a volunteer observer's own ground/2.6 mi away/242 ft/80 ft below here

precip, snowfall, snow depth

Rank-

LowellLLLM3

At a cooperative observer's station/10.8 mi away/161 ft/161 ft below here

snowfall, snow depth, precip, high, low

Rank120of 744

Station report

The weather at Fitchburg, drawn

The nearest airport reporting now, 10.1 mi from Groton, Massachusetts. From its report of Oct 16, 2026, 1:52 AM local time: 3 of its 6 sheets.

The sky

Overcast at 11,000 ft; the ceiling is 11,000 ft; visibility 10 mi or more.

Section of the sky over Fitchburg, height above the station to scale: overcast cloud with its base at 11,000 feet, the ceiling at 11,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT FITFIG. A THE SKY OVER FITCHBURGSECTION, 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 STATION02,5005,0007,50010,00012,50015,00017,500ETAGESLOWMIDDLEHIGHTHE STATIONTHE CEILOMETER READS TO 12,000 FTOVC 11,000 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 11,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEFitchburg, the skySTATION REPORT · ASOS FITTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-FIT-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-013, FB-SKY-014

The air

45.0 F with a dew point of 41.0 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 11,000 ft.

Chart of the air at Fitchburg: temperature 45.0 degrees Fahrenheit and dew point 41.0, 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 11,000 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT FITFIG. B THE AIR AT FITCHBURGTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,00030 F40 F50 F60 FSATURATES 900 FT ABOVE THE STATION, AT 40.1 FABOVE THIS SHEET: LOWEST CLOUD REPORTED, OVC 11,000 FTTEMPERATURE 45.0 FDEW POINT 41.0 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 POINTTITLEFitchburg, the airSTATION REPORT · ASOS FITTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-FIT-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 Fitchburg, 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 FITFIG. C THE WIND AT FITCHBURGPLAN, 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 FORCE73TITLEFitchburg, the windSTATION REPORT · ASOS FITTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-FIT-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Lowell (LLLM3), 10.8 miles from here, read 15 Oct, 06:00. measured daily

Elsewhere in Massachusetts

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

Near Groton

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

Near Groton

River and lake gauges