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Unionville, Pennsylvania

Community in Chester County, Pennsylvania

Air quality

The air at Unionville

Index 23, good, led by ozone. Read at 12 PM from its reporting area, Wilmington Area (DE), 15 miles off.

23Good
  • Fine particles (PM2.5)8Good5 mi
  • Ozone23Good23 ppb5 mi
  • Coarse particles (PM10)3Good14.4 mi
  • Sulfur dioxide0Good0 ppb14.4 mi

The days ahead

Yesterday measured 32, good.

Smoke, the next 45 hours

No smoke near the ground through Mon 8 AM.

SatSunMon

Precipitation

What has fallen at Unionville

0.31 in in the last 24 hours, 0.34 in over the last 3 days, to Sat 11 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.31in
Last 3 days
0.34in

Visibility

How far you can see at Unionville, the next 45 hours

Visibility stays 10 miles or more through Mon 8 AM.

SatSunMon

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

What is measuring near here

The 7 instruments nearest Unionville, 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

AvondaleAVOP1

At a river or reservoir gauge/3.8 mi away/361 ft/100 ft below here

temp, wind, gust, humidity, pressure

Rank418of 1,394

measured daily2 instruments

Kennett Square 3.1 NPA-CH-30

In a volunteer observer's own ground/1.6 mi away/398 ft/63 ft below here

precip, snowfall, snow depth

Rank-

OxfordOXFP1

At a cooperative observer's station/18.1 mi away/367 ft/94 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Coatesville, drawn

The nearest airport reporting now, 9.2 mi from Unionville, Pennsylvania. From its report of Oct 17, 2026, 11:55 AM local time: 3 of its 6 sheets.

The sky

No cloud reported; visibility 10 mi or more.

Section of the sky over Coatesville, height above the station to scale: no cloud reported, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MQSFIG. A THE SKY OVER COATESVILLESECTION, 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 SHEETNO CLOUD REPORTEDVISIBILITY, MILES: 10 MI OR MORE0510TITLECoatesville, the skySTATION REPORT · ASOS MQSTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-17IDSR-MQS-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

49.5 F with a dew point of 37.8 F, 64 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,700 ft up.

Chart of the air at Coatesville: temperature 49.5 degrees Fahrenheit and dew point 37.8, 64 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,700 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MQSFIG. B THE AIR AT COATESVILLETHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,00020 F30 F40 F50 F60 FSATURATES 2,700 FT ABOVE THE STATION, AT 35.2 FTEMPERATURE 49.5 FDEW POINT 37.8 FSPREAD 11.7 FRELATIVE HUMIDITY 64 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 POINTTITLECoatesville, the airSTATION REPORT · ASOS MQSTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-17IDSR-MQS-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north (350 degrees) at 9 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 25 mph.

Plan of the wind at Coatesville, north up: blowing from 350 degrees, the north, at 9 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 MQSFIG. C THE WIND AT COATESVILLEPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 350°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 9 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLECoatesville, the windSTATION REPORT · ASOS MQSTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-17IDSR-MQS-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Coatesville, 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 Unionville

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

Near Unionville

River and lake gauges