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Donora, Pennsylvania

Borough in Washington County, Pennsylvania

Air quality

The air at Donora

Index 13, good, led by fine particles. Read at 8 PM from its reporting area, Mon Valley Area (PA), 9 miles off.

13Good
  • Fine particles (PM2.5)13Good3.2 mi
  • Ozone-19 ppb3.2 mi

The days ahead

Good each day through Tue Oct 20, led by fine particles. Yesterday measured 29, good.

Smoke, the next 42 hours

No smoke near the ground through Sun 2 PM.

SatSun

Precipitation

What has fallen at Donora

0.06 in in the last 24 hours, 0.12 in over the last 3 days, to Fri 8 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.06in
Last 3 days
0.12in

Visibility

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

Mist or haze: visibility falls to 3 miles Fri 11 PM.

SatSun

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

What is measuring near here

The 6 instruments nearest Donora, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.7 miles away.

measured now4 instruments

measured daily2 instruments

DonoraDRAP1

At a cooperative observer's station/1.0 mi away/771 ft/172 ft below here

snowfall, snow depth, precip, high, low

Rank-

Webster 0.9 NNWPA-WT-67

In a volunteer observer's own ground/1.3 mi away/907 ft/36 ft below here

precip, snowfall, snow depth

Rank-

Station report

The weather at Pittsburgh/Alleghen, drawn

The nearest airport reporting now, 12.7 mi from Donora, Pennsylvania. From its report of Oct 16, 2026, 8:53 PM local time: 3 of its 5 sheets.

The sky

Overcast at 1,200 ft; the ceiling is 1,200 ft; visibility 6 mi.

Section of the sky over Pittsburgh/Alleghen, height above the station to scale: overcast cloud with its base at 1,200 feet, the ceiling at 1,200 feet, and visibility of 6 mi.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT AGCFIG. A THE SKY OVER PITTSBURGH/ALLEGHENSECTION, 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 1,200 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 1,200 FTVISIBILITY, MILES: 6 MI0510TITLEPittsburgh/Alleghen, the skySTATION REPORT · ASOS AGCTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 5DATE2026-10-17IDSR-AGC-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

53.0 F with a dew point of 52.0 F, 96 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 200 ft up; the lowest cloud reported is at 1,200 ft.

Chart of the air at Pittsburgh/Alleghen: temperature 53.0 degrees Fahrenheit and dew point 52.0, 96 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 200 feet above the station, against the lowest cloud reported at 1,200 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT AGCFIG. B THE AIR AT PITTSBURGH/ALLEGHENTHE 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 FSATURATES 200 FT ABOVE THE STATION, AT 51.7 FLOWEST CLOUD REPORTED, OVC 1,200 FTTEMPERATURE AND DEW POINT 53.0 F, 52.0 FRELATIVE HUMIDITY 96 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 POINTTITLEPittsburgh/Alleghen, the airSTATION REPORT · ASOS AGCTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 5DATE2026-10-17IDSR-AGC-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The column

At 1,253 ft above sea level, 4 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 28.59 inHg and the temperature at 54.5 F; the station's altimeter setting of 29.96 inHg means its barometer reads 28.63 inHg; it reports 53.0 F, 1.5 F colder than standard.

Section from sea level of where Pittsburgh/Alleghen stands in the atmosphere, height to scale: the station 1,253 feet above sea level with 4 per cent of the air below it; the standard atmosphere's pressure there, 28.59 inches of mercury, and temperature, 54.5 degrees Fahrenheit; the altimeter setting of 29.96 and the station pressure it means, 28.63.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT AGCFIG. D WHERE PITTSBURGH/ALLEGHEN STANDS IN THE ATMOSPHERESECTION FROM SEA LEVEL, HEIGHT TO SCALE, THE STATION IN THE STANDARD ATMOSPHEREFT ABOVE SEA LEVEL05,00010,00015,000SEA LEVEL, 29.92 inHg IN THE STANDARD ATMOSPHEREPITTSBURGH/ALLEGHEN4 PER CENT OF THE AIR BELOW IT1,253 FT10 PER CENT OF THE AIR BELOW, 2,890 FT20 PER CENT OF THE AIR BELOW, 6,050 FT30 PER CENT OF THE AIR BELOW, 9,540 FT40 PER CENT OF THE AIR BELOW, 13,470 FTSTANDARD PRESSURE HERE28.59 inHgSTANDARD TEMPERATURE HERE54.5 FALTIMETER SETTING, REPORTED29.96 inHgITS BAROMETER READS28.63 inHgTEMPERATURE, REPORTED53.0 FTITLEPittsburgh/Alleghen, the columnSTATION REPORT · ASOS AGCTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 3 of 5DATE2026-10-17IDSR-AGC-3DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The full report of Pittsburgh/Alleghen, in 5 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 Donora

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

Near Donora

River and lake gauges