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Cornwall, Pennsylvania

Borough in Lebanon County, Pennsylvania

Air quality

The air at Cornwall

Index 20, good, led by ozone. Read at 1 AM from its reporting area, Susquehanna Valley (PA), 25 miles off.

20Good
  • Fine particles (PM2.5)15Good14.3 mi
  • Ozone20Good20 ppb14.3 mi

The days ahead

Good each day through Tue Oct 20, led by fine particles. Yesterday measured 31, good.

Smoke, the next 43 hours

No smoke near the ground through Sun 8 PM.

SatSun

Precipitation

What has fallen at Cornwall

0.27 in in the last 24 hours, and none in the 2 days before, to Sat 1 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.27in
Last 3 days
0.27in

Visibility

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

Visibility stays 10 miles or more through Sun 8 PM.

SatSun

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

What is measuring near here

The 7 instruments nearest Cornwall, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.6 miles away.

measured now5 instruments

LancasterLNS

At an airfield/12.2 mi away/404 ft/188 ft below here

temp, wind, gust, visibility, precip, pressure

Rank9of 1,394

measured daily2 instruments

LebanonLEBP1

At a cooperative observer's station/4.2 mi away/486 ft/106 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Lancaster, drawn

The nearest airport reporting now, 12.2 mi from Cornwall, Pennsylvania. From its report of Oct 17, 2026, 12:53 AM local time: 3 of its 6 sheets.

The sky

A few clouds at 3,400 ft, scattered at 5,500 ft, overcast at 11,000 ft; the ceiling is 11,000 ft; visibility 10 mi or more.

Section of the sky over Lancaster, height above the station to scale: a few clouds cloud with its base at 3,400 feet, scattered cloud with its base at 5,500 feet, 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 LNSFIG. A THE SKY OVER LANCASTERSECTION, 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 SKYSCT 5,500 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYFEW 3,400 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYCEILING 11,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLELancaster, the skySTATION REPORT · ASOS LNSTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-17IDSR-LNS-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018, FB-SKY-013, FB-SKY-014

The air

60.0 F with a dew point of 51.0 F, 72 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,100 ft up; the lowest cloud reported is at 3,400 ft.

Chart of the air at Lancaster: temperature 60.0 degrees Fahrenheit and dew point 51.0, 72 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,100 feet above the station, against the lowest cloud reported at 3,400 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT LNSFIG. B THE AIR AT LANCASTERTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,00040 F50 F60 F70 FSATURATES 2,100 FT ABOVE THE STATION, AT 48.9 FLOWEST CLOUD REPORTED, FEW 3,400 FTTEMPERATURE 60.0 FDEW POINT 51.0 FSPREAD 9.0 FRELATIVE HUMIDITY 72 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 POINTTITLELancaster, the airSTATION REPORT · ASOS LNSTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-17IDSR-LNS-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north northwest (330 degrees) at 12 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 21 mph.

Plan of the wind at Lancaster, north up: blowing from 330 degrees, the north northwest, at 12 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 LNSFIG. C THE WIND AT LANCASTERPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 330°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 12 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLELancaster, the windSTATION REPORT · ASOS LNSTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-17IDSR-LNS-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Lancaster, 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 Cornwall

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

Near Cornwall

River and lake gauges