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South Mount Vernon, Ohio

Community in Knox County, Ohio

Air quality

The air at South Mount Vernon

Index 54, moderate, led by fine particles. Read at 6 AM from its reporting area, Columbus (OH), 37 miles off.

54Moderate
  • Fine particles (PM2.5)54Moderate-
  • Ozone29Good-
  • Coarse particles (PM10)21Good-

The days ahead

Good each day through Tue Oct 20, led by fine particles. Yesterday measured 47, good.

Smoke, the next 44 hours

No smoke near the ground through Sun 2 AM.

FriSat

Precipitation

What has fallen at South Mount Vernon

None in the last 3 days, to Fri 6 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.00in

Visibility

How far you can see at South Mount Vernon, the next 44 hours

Visibility stays 3 miles or more through Sun 2 AM, lowest 4 miles Sat 6 AM.

FriSat

On the radar over South Mount Vernon, OhioReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest South Mount Vernon, 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 now4 instruments

measured daily2 instruments

Station report

The weather at Mount Vernon, drawn

The nearest airport reporting now, 3.9 mi from South Mount Vernon, Ohio. From its report of Oct 16, 2026, 6:35 AM local time: 3 of its 6 sheets.

The sky

Broken at 7,500 ft; the ceiling is 7,500 ft; visibility 10 mi or more.

Section of the sky over Mount Vernon, height above the station to scale: broken cloud with its base at 7,500 feet, the ceiling at 7,500 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 4I3FIG. A THE SKY OVER MOUNT VERNONSECTION, 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 STATION02,5005,0007,50010,00012,500ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FTBKN 7,500 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 7,500 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEMount Vernon, the skySTATION REPORT · ASOS 4I3TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-4I3-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-013, FB-SKY-014

The air

69.8 F with a dew point of 68.0 F, 94 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 400 ft up; the lowest cloud reported is at 7,500 ft.

Chart of the air at Mount Vernon: temperature 69.8 degrees Fahrenheit and dew point 68.0, 94 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 400 feet above the station, against the lowest cloud reported at 7,500 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 4I3FIG. B THE AIR AT MOUNT VERNONTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,00060 F70 F80 FSATURATES 400 FT ABOVE THE STATION, AT 67.5 FABOVE THIS SHEET: LOWEST CLOUD REPORTED, BKN 7,500 FTTEMPERATURE AND DEW POINT 69.8 F, 68.0 FRELATIVE HUMIDITY 94 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 POINTTITLEMount Vernon, the airSTATION REPORT · ASOS 4I3TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-4I3-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the southwest (230 degrees) at 12 mph, gusting 22 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 23 mph.

Plan of the wind at Mount Vernon, north up: blowing from 230 degrees, the southwest, at 12 miles an hour, gusting 22; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 4I3FIG. C THE WIND AT MOUNT VERNONPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 230°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 12 MPH4MODERATE BREEZE135FRESH BREEZE19GUST, 22 MPH6STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEMount Vernon, the windSTATION REPORT · ASOS 4I3TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-4I3-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Centerburg 2 SE (CTRO1), 9.8 miles from here, read 15 Oct, 08:00. measured daily

Elsewhere in Ohio

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

Near South Mount Vernon

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

Near South Mount Vernon

River and lake gauges