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Jefferson, Pennsylvania

Borough in York County, Pennsylvania

Air quality

The air at Jefferson

Index 35, good, led by fine particles. Read at 2 AM from its reporting area, Susquehanna Valley (PA), 14 miles off.

35Good
  • Fine particles (PM2.5)35Good12.5 mi
  • Ozone20Good21 ppb12.5 mi

The days ahead

Good each day through Sun Oct 18, led by fine particles. Yesterday measured 28, 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 Jefferson

0.02 in in the last 24 hours, 0.06 in over the last 3 days, to Fri 2 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.02in
Last 3 days
0.06in

Visibility

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

Dense fog: visibility falls to 0.2 miles Fri 6 AM, under a mile for 1 hour.

FriSat

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

What is measuring near here

The 6 instruments nearest Jefferson, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.8 miles away.

measured now4 instruments

measured daily2 instruments

Spring GroveSGRP1

At a cooperative observer's station/3.7 mi away/472 ft/203 ft below here

snowfall, snow depth, precip, high, low

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Station report

The weather at Thomasville/York, drawn

The nearest airport reporting now, 7.2 mi from Jefferson, Pennsylvania. From its report of Oct 16, 2026, 2:53 AM local time: 3 of its 6 sheets.

The sky

Overcast at 1,200 ft; the ceiling is 1,200 ft; visibility 10 mi or more.

Section of the sky over Thomasville/York, height above the station to scale: overcast cloud with its base at 1,200 feet, the ceiling at 1,200 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT THVFIG. A THE SKY OVER THOMASVILLE/YORKSECTION, 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: 10 MI OR MORE0510TITLEThomasville/York, the skySTATION REPORT · ASOS THVTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-THV-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 57.0 F, 93 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 500 ft up; the lowest cloud reported is at 1,200 ft.

Chart of the air at Thomasville/York: temperature 59.0 degrees Fahrenheit and dew point 57.0, 93 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 500 feet above the station, against the lowest cloud reported at 1,200 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT THVFIG. B THE AIR AT THOMASVILLE/YORKTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00050 F60 F70 FSATURATES 500 FT ABOVE THE STATION, AT 56.5 FLOWEST CLOUD REPORTED, OVC 1,200 FTTEMPERATURE AND DEW POINT 59.0 F, 57.0 FRELATIVE HUMIDITY 93 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 POINTTITLEThomasville/York, the airSTATION REPORT · ASOS THVTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-THV-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south (180 degrees) at 3 mph: force 1, a light air on the Beaufort scale.

Plan of the wind at Thomasville/York, north up: blowing from 180 degrees, the south, at 3 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 1, light air, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT THVFIG. C THE WIND AT THOMASVILLE/YORKPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 180°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 3 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEThomasville/York, the windSTATION REPORT · ASOS THVTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-THV-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Thomasville/York, 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 Jefferson

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

Near Jefferson

River and lake gauges