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Maryville, Illinois

Village in Madison County, Illinois

Air quality

The air at Maryville

Index 20, good, led by ozone. Read at 11 PM from its reporting area, St. Louis (Metro-east) (IL), 11 miles off.

20Good
  • Fine particles (PM2.5)14Good9.8 mi
  • Ozone20Good8 ppb12 mi
  • Coarse particles (PM10)6Good9.8 mi
  • Nitrogen dioxide1Good1.7 ppb13.8 mi
  • Sulfur dioxide0Good0.4 ppb13.8 mi
  • Carbon monoxide-0.1 ppm13.8 mi

The days ahead

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

Smoke, the next 44 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Maryville

1.15 in in the last 24 hours, 2.45 in over the last 3 days, to Thu 11 PM. Measured by radar and rain gauges, as water.

Last 24 hours
1.15in
Last 3 days
2.45in

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

What is measuring near here

The 6 instruments nearest Maryville, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.3 miles away.

measured now4 instruments

measured daily2 instruments

AltonALNI2

At a cooperative observer's station/15.9 mi away/394 ft/184 ft below here

snowfall, snow depth, precip, high, low

Rank981of 1,393

Station report

The weather at Alton/St Louis R, drawn

The nearest airport reporting now, 12.0 mi from Maryville, Illinois. From its report of Oct 15, 2026, 11:55 PM local time: 3 of its 6 sheets.

The sky

Scattered at 900 ft, broken at 1,300 ft, overcast at 4,000 ft; the ceiling is 1,300 ft; visibility 10 mi or more.

Section of the sky over Alton/St Louis R, height above the station to scale: scattered cloud with its base at 900 feet, broken cloud with its base at 1,300 feet, overcast cloud with its base at 4,000 feet, the ceiling at 1,300 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ALNFIG. A THE SKY OVER ALTON/ST LOUIS RSECTION, 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 STATION01,0002,0003,0004,0005,0006,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 4,000 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 1,300 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYSCT 900 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYCEILING 1,300 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEAlton/St Louis R, the skySTATION REPORT · ASOS ALNTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-ALN-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 54.0 F, 83 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,200 ft up; the lowest cloud reported is at 900 ft.

Chart of the air at Alton/St Louis R: temperature 59.0 degrees Fahrenheit and dew point 54.0, 83 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,200 feet above the station, against the lowest cloud reported at 900 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ALNFIG. B THE AIR AT ALTON/ST LOUIS RTHE 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 1,200 FT ABOVE THE STATION, AT 52.8 FLOWEST CLOUD REPORTED, SCT 900 FTTEMPERATURE 59.0 FDEW POINT 54.0 FSPREAD 5.0 FRELATIVE HUMIDITY 83 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 POINTTITLEAlton/St Louis R, the airSTATION REPORT · ASOS ALNTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-ALN-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northwest (310 degrees) at 13 mph, gusting 23 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 36 mph.

Plan of the wind at Alton/St Louis R, north up: blowing from 310 degrees, the northwest, at 13 miles an hour, gusting 23; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ALNFIG. C THE WIND AT ALTON/ST LOUIS RPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 310°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 13 MPH5FRESH BREEZE19GUST, 23 MPH6STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEAlton/St Louis R, the windSTATION REPORT · ASOS ALNTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-ALN-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Alton/St Louis R, in 6 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at Alton (ALNI2), 15.9 miles from here, read 15 Oct, 05:00. measured daily

Elsewhere in Illinois

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

Near Maryville

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

Near Maryville

River and lake gauges