Storm Station
Sign in

Downingtown, Pennsylvania

Borough in Chester County, Pennsylvania

Air quality

The air at Downingtown

Index 23, good, led by ozone. Read at 11 PM from its reporting area, Wilmington Area (DE), 21 miles off.

23Good
  • Fine particles (PM2.5)14Good12.7 mi
  • Ozone23Good25 ppb12.7 mi
  • Coarse particles (PM10)9Good-

The days ahead

Yesterday measured 55, moderate.

Smoke, the next 46 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 Downingtown

None in the last 24 hours; 0.03 in over the last 3 days, to Thu 10 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.03in

Visibility

How far you can see at Downingtown, the next 46 hours

Mist or haze: visibility falls to 2 miles Fri 7 PM.

FriSat

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

What is measuring near here

The 7 instruments nearest Downingtown, 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 now5 instruments

Avondale 2 N03761

At a climate reference station/11.5 mi away/400 ft/160 ft above here

temp, humidity, wind, solar, precip

Rank759of 1,383

measured daily2 instruments

Downingtown 0.7 WSWPA-CH-37

In a volunteer observer's own ground/0.7 mi away/276 ft/36 ft above here

precip, snowfall, snow depth

Rank-

Spring City 2WSWSGCP1

At a cooperative observer's station/13.1 mi away/253 ft/13 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at West Chester, drawn

The nearest airport reporting now, 6.6 mi from Downingtown, Pennsylvania. From its report of Oct 15, 2026, 11:15 PM local time: 3 of its 6 sheets.

The sky

Overcast at 3,300 ft; the ceiling is 3,300 ft; visibility 10 mi or more.

Section of the sky over West Chester, height above the station to scale: overcast cloud with its base at 3,300 feet, the ceiling at 3,300 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT OQNFIG. A THE SKY OVER WEST CHESTERSECTION, 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 STATION01,0002,0003,0004,0005,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 3,300 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 3,300 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEWest Chester, the skySTATION REPORT · ASOS OQNTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-OQN-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

59.0 F with a dew point of 51.8 F, 77 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,700 ft up; the lowest cloud reported is at 3,300 ft.

Chart of the air at West Chester: temperature 59.0 degrees Fahrenheit and dew point 51.8, 77 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,700 feet above the station, against the lowest cloud reported at 3,300 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT OQNFIG. B THE AIR AT WEST CHESTERTHE 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 1,700 FT ABOVE THE STATION, AT 50.1 FLOWEST CLOUD REPORTED, OVC 3,300 FTTEMPERATURE 59.0 FDEW POINT 51.8 FSPREAD 7.2 FRELATIVE HUMIDITY 77 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 POINTTITLEWest Chester, the airSTATION REPORT · ASOS OQNTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-OQN-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at West Chester, 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 OQNFIG. C THE WIND AT WEST CHESTERPLAN, 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 FORCE73TITLEWest Chester, the windSTATION REPORT · ASOS OQNTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-OQN-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of West Chester, 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 Downingtown

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

Near Downingtown

River and lake gauges