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Fairmont City, Illinois

Village in St. Clair County, Illinois

Air quality

The air at Fairmont City

Index 19, good, led by ozone. Read at 6 AM from its reporting area, St. Louis (Metro-east) (IL), 9 miles off.

19Good
  • Fine particles (PM2.5)18Good4.2 mi
  • Ozone19Good14 ppb4.2 mi
  • Coarse particles (PM10)6Good4.3 mi
  • Nitrogen dioxide2Good2.1 ppb5.3 mi
  • Sulfur dioxide0Good0.4 ppb5.3 mi
  • Carbon monoxide-0.2 ppm5.3 mi

The days ahead

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

Smoke, the next 43 hours

No smoke near the ground through Sun 1 AM.

FriSat

Precipitation

What has fallen at Fairmont City

0.73 in in the last 24 hours, 1.95 in over the last 3 days, to Fri 6 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.73in
Last 3 days
1.95in

Visibility

How far you can see at Fairmont City, the next 43 hours

Visibility stays 6 miles or more through Sun 1 AM, lowest 7 miles Fri 6 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Fairmont City, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.0 miles away.

measured now4 instruments

measured daily2 instruments

Fairmont City 0.9 ENEIL-SC-18

In a volunteer observer's own ground/1.0 mi away/420 ft/1 ft above here

precip, snowfall, snow depth

Rank-

Milstadt 2SWMSTI2

At a cooperative observer's station/14.5 mi away/656 ft/237 ft above here

snowfall, snow depth, precip, high, low

Rank33of 1,393

Station report

The weather at Cahokia/St Louis, drawn

The nearest airport reporting now, 6.1 mi from Fairmont City, Illinois. From its report of Oct 16, 2026, 6:53 AM local time: 3 of its 6 sheets.

The sky

Scattered at 3,700 ft; visibility 10 mi or more.

Section of the sky over Cahokia/St Louis, height above the station to scale: scattered cloud with its base at 3,700 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CPSFIG. A THE SKY OVER CAHOKIA/ST LOUISSECTION, 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 SHEETSCT 3,700 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYVISIBILITY, MILES: 10 MI OR MORE0510TITLECahokia/St Louis, the skySTATION REPORT · ASOS CPSTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-CPS-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

54.0 F with a dew point of 41.0 F, 61 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 3,000 ft up; the lowest cloud reported is at 3,700 ft.

Chart of the air at Cahokia/St Louis: temperature 54.0 degrees Fahrenheit and dew point 41.0, 61 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 3,000 feet above the station, against the lowest cloud reported at 3,700 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CPSFIG. B THE AIR AT CAHOKIA/ST LOUISTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,00030 F40 F50 F60 FSATURATES 3,000 FT ABOVE THE STATION, AT 38.2 FLOWEST CLOUD REPORTED, SCT 3,700 FTTEMPERATURE 54.0 FDEW POINT 41.0 FSPREAD 13.0 FRELATIVE HUMIDITY 61 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 POINTTITLECahokia/St Louis, the airSTATION REPORT · ASOS CPSTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-CPS-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north northwest (330 degrees) at 24 mph, gusting 35 mph: force 5, a fresh breeze on the Beaufort scale. The strongest gust today was 39 mph.

Plan of the wind at Cahokia/St Louis, north up: blowing from 330 degrees, the north northwest, at 24 miles an hour, gusting 35; beside it the Beaufort scale from calm to hurricane force, force 5, fresh breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CPSFIG. C THE WIND AT CAHOKIA/ST LOUISPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 330°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE19NOW, 24 MPH6STRONG BREEZE257NEAR GALE32GUST, 35 MPH8GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLECahokia/St Louis, the windSTATION REPORT · ASOS CPSTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-CPS-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Cahokia/St Louis, in 6 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 Fairmont City

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

Near Fairmont City

River and lake gauges