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Exton, Pennsylvania

Community in Chester County, Pennsylvania

Air quality

The air at Exton

Index 17, good, led by ozone. Read at 3 AM from its reporting area, Wilmington Area (DE), 21 miles off.

17Good
  • Fine particles (PM2.5)14Good15.1 mi
  • Ozone17Good-
  • Coarse particles (PM10)7Good-

The days ahead

Yesterday measured 25, good.

Smoke, the next 41 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 Exton

None in the last 24 hours; 0.02 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
0.02in

Visibility

How far you can see at Exton, the next 41 hours

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

FriSat

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

What is measuring near here

The 7 instruments nearest Exton, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.6 miles away.

measured now5 instruments

measured daily2 instruments

West Chester 3.9 NNWPA-CH-65

In a volunteer observer's own ground/1.6 mi away/521 ft/198 ft above here

precip, snowfall, snow depth

Rank-

PhoenixvillePHXP1

At a cooperative observer's station/9.3 mi away/154 ft/169 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Citizen station GW7408, drawn

The nearest instrument reporting now, 4.8 mi from Exton, Pennsylvania. From its report of undefined: 3 of its 4 sheets.

The wind

Calm.

Plan of the wind at Citizen station GW7408, 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 GW7408FIG. C THE WIND AT CITIZEN STATION GW7408PLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONCALMBEAUFORT FORCELEAST WIND, MPH0CALM0NOW, 0 MPH1LIGHT AIR1GUST, 2 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLECitizen station GW7408, the windSTATION REPORT · CWOP GW7408TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 1 of 4DATE2026-10-16IDSR-GW7408-1DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008

The column

At 545 ft above sea level, 2 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.34 inHg and the temperature at 57.1 F; the station's altimeter setting of 30.04 inHg means its barometer reads 29.45 inHg; it reports 57.0 F, 0.1 F colder than standard.

Section from sea level of where Citizen station GW7408 stands in the atmosphere, height to scale: the station 545 feet above sea level with 2 per cent of the air below it; the standard atmosphere's pressure there, 29.34 inches of mercury, and temperature, 57.1 degrees Fahrenheit; the altimeter setting of 30.04 and the station pressure it means, 29.45.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT GW7408FIG. D WHERE CITIZEN STATION GW7408 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 ATMOSPHERECITIZEN STATION GW74082 PER CENT OF THE AIR BELOW IT545 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 HERE29.34 inHgSTANDARD TEMPERATURE HERE57.1 FALTIMETER SETTING, REPORTED30.04 inHgITS BAROMETER READS29.45 inHgTEMPERATURE, REPORTED57.0 FTITLECitizen station GW7408, the columnSTATION REPORT · CWOP GW7408TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 4DATE2026-10-16IDSR-GW7408-2DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The sun

On Oct 16 the noon sun stands 41 degrees above the horizon at 40.09 N, and the day is 10 h 58 min long. Level ground there takes 65 per cent of the noon sunlight a surface facing the sun would.

Elevation of the noon sun at Citizen station GW7408, angles true: on Oct 16 it stands 41 degrees above the horizon, against 73 at the June solstice, 50 at the equinoxes and 26 at the December solstice; the day is 10 h 58 min long.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT GW7408FIG. E THE SUN AT CITIZEN STATION GW7408ELEVATION LOOKING WEST, SOUTH TO THE LEFT: THE NOON SUN ON THE DAY OF THE REPORT, AND AT THE SOLSTICES AND EQUINOXES; ANGLES TRUETHE STATIONJUNE SOLSTICE 73°EQUINOXES 50°DECEMBER SOLSTICE 26°OCT 16, 41°SOUTHANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLYDAY LENGTH 10 H 58 MINLEVEL GROUND TAKES 65 PER CENT OF THE NOON SUN A FACING SURFACE WOULDLATITUDE 40.09 N; THE SUN'S DECLINATION -9.1°TITLECitizen station GW7408, the sunSTATION REPORT · CWOP GW7408TYPEELEVATIONSCALEANGLES TRUEREVAS REPORTED SHEET 3 of 4DATE2026-10-16IDSR-GW7408-3DRAWN AS linework on paperSOURCES FB-ENG-007

The full report of Citizen station GW7408, in 4 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 Exton

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

Near Exton

River and lake gauges