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Chester, Pennsylvania

City in Delaware County, Pennsylvania

Air quality

The air at Chester

Index 15, good, led by ozone. Read at 2 AM from its reporting area, Wilmington Area (DE), 12 miles off.

15Good
  • Fine particles (PM2.5)14Good1 mi
  • Ozone15Good-
  • Coarse particles (PM10)7Good-

The days ahead

Yesterday measured 25, good.

Smoke, the next 42 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 Chester

None in the last 24 hours; 0.01 in over the last 3 days, to Fri 2 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.01in

Visibility

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

Visibility stays 4 miles or more through Sat 8 PM, lowest 5 miles Fri 8 PM.

FriSat

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

What is measuring near here

The 7 instruments nearest Chester, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.0 miles away.

measured now5 instruments

Avondale 2 N03761

At a climate reference station/21.7 mi away/400 ft/360 ft above here

temp, humidity, wind, solar, precip

Rank759of 1,383

measured daily2 instruments

Wallingford 0.9 SPA-DL-27

In a volunteer observer's own ground/2.0 mi away/90 ft/50 ft above here

precip, snowfall, snow depth

Rank-

Franklin InstitutePFIP1

At a cooperative observer's station/12.8 mi away/131 ft/91 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Philadelphia Intl, drawn

The nearest airport reporting now, 7.8 mi from Chester, Pennsylvania. From its report of Oct 16, 2026, 2:54 AM local time: 3 of its 6 sheets.

The sky

Overcast at 2,300 ft; the ceiling is 2,300 ft; visibility 10 mi or more.

Section of the sky over Philadelphia Intl, height above the station to scale: overcast cloud with its base at 2,300 feet, the ceiling at 2,300 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT PHLFIG. A THE SKY OVER PHILADELPHIA INTLSECTION, 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 STATION05001,0001,5002,0002,5003,0003,500ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 2,300 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 2,300 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEPhiladelphia Intl, the skySTATION REPORT · ASOS PHLTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-PHL-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

61.0 F with a dew point of 55.0 F, 81 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,400 ft up; the lowest cloud reported is at 2,300 ft.

Chart of the air at Philadelphia Intl: temperature 61.0 degrees Fahrenheit and dew point 55.0, 81 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,400 feet above the station, against the lowest cloud reported at 2,300 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT PHLFIG. B THE AIR AT PHILADELPHIA INTLTHE 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 1,400 FT ABOVE THE STATION, AT 53.6 FLOWEST CLOUD REPORTED, OVC 2,300 FTTEMPERATURE 61.0 FDEW POINT 55.0 FSPREAD 6.0 FRELATIVE HUMIDITY 81 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 POINTTITLEPhiladelphia Intl, the airSTATION REPORT · ASOS PHLTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-PHL-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Philadelphia Intl, north up: calm; beside it the Beaufort scale from calm to hurricane force, force 0, calm, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT PHLFIG. C THE WIND AT PHILADELPHIA INTLPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONCALMBEAUFORT FORCELEAST WIND, MPH0CALM0NOW, 0 MPH1LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEPhiladelphia Intl, the windSTATION REPORT · ASOS PHLTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-PHL-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Philadelphia Intl, in 6 sheets, each beside the Field Book plates that explain it

-

Snow on the ground

Elsewhere in Pennsylvania

24 places, each with its own forecast and its own instruments.

Near Chester

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

Near Chester

River and lake gauges