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Herndon, Pennsylvania

Borough in Northumberland County, Pennsylvania

Air quality

The air at Herndon

Index 25, good, led by ozone. Read at 12 AM from its reporting area, Williamsport (PA), 38 miles off.

25Good
  • Ozone25Good-

The days ahead

Good each day through Sun Oct 18, led by fine particles. Yesterday measured 32, good.

Smoke, the next 44 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 Herndon

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

Last 24 hours
0.00in
Last 3 days
0.00in

Visibility

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

Mist or haze: visibility falls to 1 miles Fri 5 PM.

FriSat

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

What is measuring near here

The 7 instruments nearest Herndon, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.9 miles away.

measured now5 instruments

measured daily2 instruments

SelinsgroveSLGP1

At a cooperative observer's station/5.5 mi away/436 ft/305 ft below here

snowfall, snow depth, precip, high, low

Rank-

Freeburg 0.9 NPA-SN-3

In a volunteer observer's own ground/7.0 mi away/686 ft/55 ft below here

precip, snowfall, snow depth

Rank-

Station report

The weather at Selinsgrove, drawn

The nearest airport reporting now, 8.1 mi from Herndon, Pennsylvania. From its report of Oct 16, 2026, 12:03 AM local time: 3 of its 6 sheets.

The sky

Broken at 800 ft, overcast at 1,300 ft; the ceiling is 800 ft; visibility 5 mi.

Section of the sky over Selinsgrove, height above the station to scale: broken cloud with its base at 800 feet, overcast cloud with its base at 1,300 feet, the ceiling at 800 feet, and visibility of 5 mi.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SEGFIG. A THE SKY OVER SELINSGROVESECTION, 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 1,300 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 800 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 800 FTVISIBILITY, MILES: 5 MI0510TITLESelinsgrove, the skySTATION REPORT · ASOS SEGTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-SEG-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

58.0 F with a dew point of 56.0 F, 93 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 500 ft up; the lowest cloud reported is at 800 ft.

Chart of the air at Selinsgrove: temperature 58.0 degrees Fahrenheit and dew point 56.0, 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, against the lowest cloud reported at 800 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SEGFIG. B THE AIR AT SELINSGROVETHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00040 F50 F60 F70 FSATURATES 500 FT ABOVE THE STATION, AT 55.5 FLOWEST CLOUD REPORTED, BKN 800 FTTEMPERATURE AND DEW POINT 58.0 F, 56.0 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 POINTTITLESelinsgrove, the airSTATION REPORT · ASOS SEGTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-SEG-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south (180 degrees) at 9 mph: force 3, a gentle breeze on the Beaufort scale.

Plan of the wind at Selinsgrove, north up: blowing from 180 degrees, the south, at 9 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SEGFIG. C THE WIND AT SELINSGROVEPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 180°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 9 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLESelinsgrove, the windSTATION REPORT · ASOS SEGTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-SEG-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Selinsgrove, 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 Herndon

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

Near Herndon

River and lake gauges