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Salem, Illinois

City in Marion County, Illinois

Air quality

The air at Salem

Index 19, good, led by ozone. Read at 2 AM from its reporting area, St. Louis (Metro-east) (IL), 55 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 Salem

0.51 in in the last 24 hours, 0.85 in over the last 3 days, to Fri 1 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.51in
Last 3 days
0.85in

Visibility

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

Visibility stays 6 miles or more through Sat 7 PM, lowest 7 miles Fri 3 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Salem, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.1 miles away.

measured now4 instruments

FloraFOAI2

At a river or reservoir gauge/25.4 mi away/490 ft/52 ft below here

temp, wind, gust, humidity, pressure

Rank888of 1,393

measured daily2 instruments

Salem 0.2 EIL-MN-1

In a volunteer observer's own ground/0.1 mi away/545 ft/3 ft above here

precip, snowfall, snow depth

Rank-

SalemSLOI2

At a cooperative observer's station/0.2 mi away/548 ft/6 ft above here

snowfall, snow depth, precip, high, low

Rank353of 1,393

Station report

The weather at Salem/Leckrone, drawn

The nearest airport reporting now, 1.2 mi from Salem, Illinois. From its report of Oct 16, 2026, 2:15 AM local time: 3 of its 5 sheets.

The sky

Scattered at 1,600 ft, broken at 2,300 ft, overcast at 4,600 ft; the ceiling is 2,300 ft; visibility 10 mi or more.

Section of the sky over Salem/Leckrone, height above the station to scale: scattered cloud with its base at 1,600 feet, broken cloud with its base at 2,300 feet, overcast cloud with its base at 4,600 feet, the ceiling at 2,300 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 STATION01,0002,0003,0004,0005,0006,0007,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 4,600 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 2,300 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYSCT 1,600 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYCEILING 2,300 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

58.6 F with a dew point of 53.0 F, 82 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 1,600 ft.

Chart of the air at Salem/Leckrone: temperature 58.6 degrees Fahrenheit and dew point 53.0, 82 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 1,600 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 51.7 FLOWEST CLOUD REPORTED, SCT 1,600 FTTEMPERATURE 58.6 FDEW POINT 53.0 FSPREAD 5.6 FRELATIVE HUMIDITY 82 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 30.04 inHg means its barometer reads 29.42 inHg; it reports 58.6 F, 1.6 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 30.04 and the station pressure it means, 29.42.1122334455667788AABBCCDDEE© 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, REPORTED30.04 inHgITS BAROMETER READS29.42 inHgTEMPERATURE, REPORTED58.6 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 Salem

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

Near Salem

River and lake gauges