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St. Jacob, Illinois

Village in Madison County, Illinois

Air quality

The air at St. Jacob

Index 16, good, led by ozone. Read at 4 PM from its reporting area, St. Louis (Metro-east) (IL), 15 miles off.

16Good
  • Fine particles (PM2.5)15Good20 mi
  • Ozone16Good12 ppb20.5 mi
  • Coarse particles (PM10)6Good20 mi
  • Nitrogen dioxide2Good2.6 ppb23.5 mi
  • Sulfur dioxide0Good0.4 ppb23.5 mi
  • Carbon monoxide-0.2 ppm23.5 mi

The days ahead

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

Smoke, the next 45 hours

No smoke near the ground through Sun 1 PM.

FriSatSun

Precipitation

What has fallen at St. Jacob

0.02 in in the last 24 hours, 1.35 in over the last 3 days, to Fri 4 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.02in
Last 3 days
1.35in

Visibility

How far you can see at St. Jacob, the next 45 hours

Visibility stays 9 miles or more through Sun 1 PM, lowest 9 miles Sat 7 AM.

FriSatSun

On the radar over St. Jacob, IllinoisReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest St. Jacob, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.5 miles away.

measured now4 instruments

measured daily2 instruments

Highland 5.0 WIL-MD-57

In a volunteer observer's own ground/0.8 mi away/509 ft/1 ft below here

precip, snowfall, snow depth

Rank-

HighlandHGHI2

At a cooperative observer's station/5.6 mi away/518 ft/8 ft above here

snowfall, snow depth, precip, high, low

Rank43of 1,393

Station report

The weather at Belleville - Scott AFB, drawn

The nearest airport reporting now, 12.7 mi from St. Jacob, Illinois. From its report of Oct 16, 2026, 4:48 PM local time: 3 of its 6 sheets.

The sky

Scattered at 2,300 ft, broken at 3,000 ft, broken at 4,600 ft, broken at 7,500 ft; the ceiling is 3,000 ft; visibility 10 mi or more.

Section of the sky over Belleville - Scott AFB, height above the station to scale: scattered cloud with its base at 2,300 feet, broken cloud with its base at 3,000 feet, broken cloud with its base at 4,600 feet, broken cloud with its base at 7,500 feet, the ceiling at 3,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BLVFIG. A THE SKY OVER BELLEVILLE - SCOTT AFBSECTION, 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 STATIONBKN 7,500 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYBKN 4,600 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYBKN 3,000 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYSCT 2,300 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYCEILING 3,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEBelleville - Scott AFB, the skySTATION REPORT · ASOS BLVTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-BLV-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018, FB-SKY-013, FB-SKY-014

The air

55.4 F with a dew point of 50.0 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 2,300 ft.

Chart of the air at Belleville - Scott AFB: temperature 55.4 degrees Fahrenheit and dew point 50.0, 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 2,300 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BLVFIG. B THE AIR AT BELLEVILLE - SCOTT AFBTHE 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 48.7 FLOWEST CLOUD REPORTED, SCT 2,300 FTTEMPERATURE 55.4 FDEW POINT 50.0 FSPREAD 5.4 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 POINTTITLEBelleville - Scott AFB, the airSTATION REPORT · ASOS BLVTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-BLV-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northwest (320 degrees) at 17 mph, gusting 25 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 35 mph.

Plan of the wind at Belleville - Scott AFB, north up: blowing from 320 degrees, the northwest, at 17 miles an hour, gusting 25; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BLVFIG. C THE WIND AT BELLEVILLE - SCOTT AFBPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 320°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 17 MPH5FRESH BREEZE196STRONG BREEZE25GUST, 25 MPH7NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEBelleville - Scott AFB, the windSTATION REPORT · ASOS BLVTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-BLV-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Belleville - Scott AFB, in 6 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at Highland (HGHI2), 5.6 miles from here, read 16 Oct, 07:00. measured daily

Elsewhere in Illinois

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

Near St. Jacob

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

Near St. Jacob

River and lake gauges