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Vandalia, Illinois

City in Fayette County, Illinois

Air quality

The air at Vandalia

Index 19, good, led by ozone. Read at 3 AM from its reporting area, St. Louis (Metro-east) (IL), 54 miles off.

19Good
  • Fine particles (PM2.5)9Good-
  • Ozone19Good-
  • Coarse particles (PM10)4Good-

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 39, good.

Smoke, the next 41 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Vandalia

0.76 in in the last 24 hours, 1.10 in over the last 3 days, to Fri 2 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.76in
Last 3 days
1.10in

Visibility

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

Visibility stays 10 miles or more through Sat 7 PM.

FriSat

On the radar over Vandalia, IllinoisReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Vandalia, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.2 miles away.

measured now4 instruments

FloraFOAI2

At a river or reservoir gauge/39.8 mi away/490 ft/25 ft below here

temp, wind, gust, humidity, pressure

Rank888of 1,393

measured daily2 instruments

VandaliaVNDI2

At a cooperative observer's station/0.2 mi away/525 ft/10 ft above here

snowfall, snow depth, precip, high, low

Rank-

Mulberry Grove 0.7 SWIL-BD-6

In a volunteer observer's own ground/10.0 mi away/512 ft/3 ft below here

precip, snowfall, snow depth

Rank-

Station report

The weather at Salem/Leckrone, drawn

The nearest airport reporting now, 23.8 mi from Vandalia, Illinois. From its report of Oct 16, 2026, 3:35 AM local time: 3 of its 5 sheets.

The sky

Overcast at 2,000 ft; the ceiling is 2,000 ft; visibility 10 mi or more.

Section of the sky over Salem/Leckrone, height above the station to scale: overcast cloud with its base at 2,000 feet, the ceiling at 2,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SLOFIG. A THE SKY OVER SALEM/LECKRONESECTION, 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 2,000 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 2,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLESalem/Leckrone, the skySTATION REPORT · ASOS SLOTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 5DATE2026-10-16IDSR-SLO-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

57.2 F with a dew point of 51.4 F, 81 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,300 ft up; the lowest cloud reported is at 2,000 ft.

Chart of the air at Salem/Leckrone: temperature 57.2 degrees Fahrenheit and dew point 51.4, 81 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,300 feet above the station, against the lowest cloud reported at 2,000 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SLOFIG. B THE AIR AT SALEM/LECKRONETHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00040 F50 F60 F70 FSATURATES 1,300 FT ABOVE THE STATION, AT 50.0 FLOWEST CLOUD REPORTED, OVC 2,000 FTTEMPERATURE 57.2 FDEW POINT 51.4 FSPREAD 5.8 FRELATIVE HUMIDITY 81 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 POINTTITLESalem/Leckrone, the airSTATION REPORT · ASOS SLOTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 5DATE2026-10-16IDSR-SLO-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The column

At 574 ft above sea level, 2 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.31 inHg and the temperature at 57.0 F; the station's altimeter setting of 30.06 inHg means its barometer reads 29.44 inHg; it reports 57.2 F, 0.2 F warmer than standard.

Section from sea level of where Salem/Leckrone stands in the atmosphere, height to scale: the station 574 feet above sea level with 2 per cent of the air below it; the standard atmosphere's pressure there, 29.31 inches of mercury, and temperature, 57.0 degrees Fahrenheit; the altimeter setting of 30.06 and the station pressure it means, 29.44.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SLOFIG. D WHERE SALEM/LECKRONE 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 ATMOSPHERESALEM/LECKRONE2 PER CENT OF THE AIR BELOW IT574 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 HERE29.31 inHgSTANDARD TEMPERATURE HERE57.0 FALTIMETER SETTING, REPORTED30.06 inHgITS BAROMETER READS29.44 inHgTEMPERATURE, REPORTED57.2 FTITLESalem/Leckrone, the columnSTATION REPORT · ASOS SLOTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 3 of 5DATE2026-10-16IDSR-SLO-3DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The full report of Salem/Leckrone, in 5 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in Illinois

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

Near Vandalia

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

Near Vandalia

River and lake gauges