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Clark, Pennsylvania

Borough in Mercer County, Pennsylvania

Air quality

The air at Clark

Index 45, good, led by fine particles. Read at 2 AM from its reporting area, Mercer County (PA), 12 miles off.

45Good
  • Fine particles (PM2.5)45Good5.6 mi
  • Ozone14Good10 ppb5.6 mi

The days ahead

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

Smoke, the next 43 hours

No smoke near the ground through Sat 8 PM.

FriSat

Precipitation

What has fallen at Clark

None in the last 24 hours; 0.10 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
0.10in

Visibility

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

Visibility stays 3 miles or more through Sat 8 PM, lowest 4 miles Fri 1 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Clark, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.3 miles away.

measured now4 instruments

New CastleUCP

At an airfield/17.6 mi away/1,072 ft/97 ft above here

temp, wind, gust, visibility, precip, pressure

Rank4of 1,383

measured daily2 instruments

Hermitage 2.7 NPA-MR-16

In a volunteer observer's own ground/1.3 mi away/1,027 ft/52 ft above here

precip, snowfall, snow depth

Rank-

PymatuningJMSP1

At a cooperative observer's station/15.4 mi away/1,017 ft/42 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at New Castle, drawn

The nearest airport reporting now, 17.6 mi from Clark, Pennsylvania. From its report of Oct 16, 2026, 1:56 AM local time: 3 of its 6 sheets.

The sky

Overcast at 500 ft; the ceiling is 500 ft; visibility 9 mi.

Section of the sky over New Castle, height above the station to scale: overcast cloud with its base at 500 feet, the ceiling at 500 feet, and visibility of 9 mi.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT UCPFIG. A THE SKY OVER NEW CASTLESECTION, 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: 9 MI0510TITLENew Castle, the skySTATION REPORT · ASOS UCPTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-UCP-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

66.0 F with a dew point of 66.0 F, 100 per cent relative humidity. The air is saturated at the ground; the lowest cloud reported is at 500 ft.

Chart of the air at New Castle: temperature 66.0 degrees Fahrenheit and dew point 66.0, 100 per cent relative humidity; the air saturated at the ground, against the lowest cloud reported at 500 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT UCPFIG. B THE AIR AT NEW CASTLETHE 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 F80 FSATURATED AT THE GROUNDLOWEST CLOUD REPORTED, OVC 500 FTTEMPERATURE AND DEW POINT 66.0 F, 66.0 FRELATIVE HUMIDITY 100 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 POINTTITLENew Castle, the airSTATION REPORT · ASOS UCPTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-UCP-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

At 6 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at New Castle, north up: at 6 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 2, light breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT UCPFIG. C THE WIND AT NEW CASTLEPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONDIRECTION NOT REPORTEDBEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 6 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLENew Castle, the windSTATION REPORT · ASOS UCPTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-UCP-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of New Castle, 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 Clark

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

Near Clark

River and lake gauges