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Williamstown, Pennsylvania

Borough in Dauphin County, Pennsylvania

Air quality

The air at Williamstown

Index 35, good, led by fine particles. Read at 2 AM from its reporting area, Susquehanna Valley (PA), 44 miles off.

35Good
  • Fine particles (PM2.5)35Good21.5 mi
  • Ozone20Good22 ppb21.5 mi

The days ahead

Good each day through Sun Oct 18, led by fine particles. Yesterday measured 28, good.

Smoke, the next 42 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 Williamstown

None in the last 24 hours; 0.04 in over the last 3 days, to Fri 2 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.04in

Visibility

How far you can see at Williamstown, the next 42 hours

Fog: visibility falls to 0.8 miles Fri 6 AM, under a mile for 1 hour.

FriSat

On the radar over Williamstown, PennsylvaniaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 7 instruments nearest Williamstown, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 4.6 miles away.

measured now5 instruments

measured daily2 instruments

NataliePOPP1

At a cooperative observer's station/18.5 mi away/915 ft/151 ft above here

snowfall, snow depth, precip, high, low

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Station report

The weather at Muir AAF/Indiantown, drawn

The nearest airport reporting now, 10.4 mi from Williamstown, Pennsylvania. From its report of Oct 16, 2026, 2:55 AM local time: 3 of its 6 sheets.

The sky

Overcast at 500 ft; the ceiling is 500 ft; visibility 4 mi.

Section of the sky over Muir AAF/Indiantown, height above the station to scale: overcast cloud with its base at 500 feet, the ceiling at 500 feet, and visibility of 4 mi.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MUIFIG. A THE SKY OVER MUIR AAF/INDIANTOWNSECTION, 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 SHEETOVC 500 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 500 FTVISIBILITY, MILES: 4 MI0510TITLEMuir AAF/Indiantown, the skySTATION REPORT · ASOS MUITYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-MUI-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

58.3 F with a dew point of 56.5 F, 94 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 400 ft up; the lowest cloud reported is at 500 ft.

Chart of the air at Muir AAF/Indiantown: temperature 58.3 degrees Fahrenheit and dew point 56.5, 94 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 400 feet above the station, against the lowest cloud reported at 500 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MUIFIG. B THE AIR AT MUIR AAF/INDIANTOWNTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00050 F60 F70 FSATURATES 400 FT ABOVE THE STATION, AT 56.1 FLOWEST CLOUD REPORTED, OVC 500 FTTEMPERATURE AND DEW POINT 58.3 F, 56.5 FRELATIVE HUMIDITY 94 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 POINTTITLEMuir AAF/Indiantown, the airSTATION REPORT · ASOS MUITYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-MUI-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 Muir AAF/Indiantown, 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 MUIFIG. C THE WIND AT MUIR AAF/INDIANTOWNPLAN, 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 FORCE73TITLEMuir AAF/Indiantown, the windSTATION REPORT · ASOS MUITYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-MUI-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Muir AAF/Indiantown, in 6 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in Pennsylvania

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

Near Williamstown

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

Near Williamstown

River and lake gauges