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Slippery Rock, Pennsylvania

Borough in Butler County, Pennsylvania

Air quality

The air at Slippery Rock

Index 17, good, led by ozone. Read at 2 PM from its reporting area, Mercer County (PA), 16 miles off.

17Good
  • Fine particles (PM2.5)11Good-
  • Ozone17Good-

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 Sun 8 AM.

FriSatSun

Precipitation

What has fallen at Slippery Rock

0.22 in in the last 24 hours, 0.35 in over the last 3 days, to Fri 1 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.22in
Last 3 days
0.35in

Visibility

How far you can see at Slippery Rock, the next 43 hours

Mist or haze: visibility falls to 2 miles Sat 8 AM.

FriSatSun

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

What is measuring near here

The 6 instruments nearest Slippery Rock, 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

Slippery RockSLPP1

At a river or reservoir gauge/3.6 mi away/1,224 ft/126 ft below here

temp, wind, gust, humidity, pressure

Rank-

New CastleUCP

At an airfield/18.9 mi away/1,072 ft/278 ft below here

temp, wind, gust, visibility, precip, pressure

Rank4of 1,383

measured daily2 instruments

Station report

The weather at New Castle, drawn

The nearest airport reporting now, 18.9 mi from Slippery Rock, Pennsylvania. From its report of Oct 16, 2026, 2:27 PM local time: 3 of its 6 sheets.

The sky

Broken at 1,500 ft, broken at 3,600 ft, overcast at 8,500 ft; the ceiling is 1,500 ft; visibility 10 mi or more.

Section of the sky over New Castle, height above the station to scale: broken cloud with its base at 1,500 feet, broken cloud with its base at 3,600 feet, overcast cloud with its base at 8,500 feet, the ceiling at 1,500 feet, and visibility of 10 mi or more.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 STATION02,5005,0007,50010,00012,50015,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FTOVC 8,500 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 3,600 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYBKN 1,500 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 1,500 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLENew 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, FB-SKY-013, FB-SKY-014

The air

57.2 F with a dew point of 55.4 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 1,500 ft.

Chart of the air at New Castle: temperature 57.2 degrees Fahrenheit and dew point 55.4, 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 1,500 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 STATION01,0002,0003,00040 F50 F60 F70 FSATURATES 400 FT ABOVE THE STATION, AT 54.9 FLOWEST CLOUD REPORTED, BKN 1,500 FTTEMPERATURE AND DEW POINT 57.2 F, 55.4 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 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

From the west (260 degrees) at 12 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 26 mph.

Plan of the wind at New Castle, north up: blowing from 260 degrees, the west, 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 UCPFIG. C THE WIND AT NEW CASTLEPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 260°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 12 MPH4MODERATE 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 Slippery Rock

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

Near Slippery Rock

River and lake gauges