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Walnut Hill, Illinois

Village in Marion County, Illinois

Air quality

The air at Walnut Hill

Index 23, good, led by ozone. Read at 10 PM from its reporting area, St. Louis (Metro-east) (IL), 51 miles off.

23Good
  • Fine particles (PM2.5)16Good-
  • Ozone23Good-
  • Coarse particles (PM10)6Good-

The days ahead

Highest moderate, today, led by fine particles. Yesterday measured 39, good.

Smoke, the next 45 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Walnut Hill

0.41 in in the last 24 hours, 1.40 in over the last 3 days, to Thu 10 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.41in
Last 3 days
1.40in

Visibility

How far you can see at Walnut Hill, the next 45 hours

Visibility stays 8 miles or more through Sat 7 PM, lowest 9 miles Thu 11 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Walnut Hill, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 3.6 miles away.

measured now4 instruments

CentraliaENL

At an airfield/3.6 mi away/535 ft/34 ft below here

temp, wind, gust, visibility, precip, pressure

Rank652of 1,393

measured daily2 instruments

Centralia 1.6 WIL-CT-1

In a volunteer observer's own ground/6.9 mi away/492 ft/77 ft below here

precip, snowfall, snow depth

Rank-

CentraliaCNTI2

At a cooperative observer's station/7.1 mi away/472 ft/97 ft below here

snowfall, snow depth, precip, high, low

Rank989of 1,393

Station report

The weather at Centralia, drawn

The nearest airport reporting now, 3.6 mi from Walnut Hill, Illinois. From its report of Oct 15, 2026, 10:55 PM local time: 3 of its 6 sheets.

The sky

Scattered at 5,000 ft, scattered at 8,000 ft; visibility 10 mi or more.

Section of the sky over Centralia, height above the station to scale: scattered cloud with its base at 5,000 feet, scattered cloud with its base at 8,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ENLFIG. A THE SKY OVER CENTRALIASECTION, 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 STATIONTHE CEILOMETER READS TO 12,000 FTSCT 8,000 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYSCT 5,000 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYVISIBILITY, MILES: 10 MI OR MORE0510TITLECentralia, the skySTATION REPORT · ASOS ENLTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-ENL-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

73.0 F with a dew point of 70.3 F, 91 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 600 ft up; the lowest cloud reported is at 5,000 ft.

Chart of the air at Centralia: temperature 73.0 degrees Fahrenheit and dew point 70.3, 91 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 600 feet above the station, against the lowest cloud reported at 5,000 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ENLFIG. B THE AIR AT CENTRALIATHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,00060 F70 F80 FSATURATES 600 FT ABOVE THE STATION, AT 69.6 FLOWEST CLOUD REPORTED, SCT 5,000 FTTEMPERATURE AND DEW POINT 73.0 F, 70.3 FRELATIVE HUMIDITY 91 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 POINTTITLECentralia, the airSTATION REPORT · ASOS ENLTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-ENL-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the southwest (230 degrees) at 8 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 21 mph.

Plan of the wind at Centralia, north up: blowing from 230 degrees, the southwest, at 8 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ENLFIG. C THE WIND AT CENTRALIAPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 230°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 8 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLECentralia, the windSTATION REPORT · ASOS ENLTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-ENL-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Centralia, in 6 sheets, each beside the Field Book plates that explain it

-

Snow on the ground

Elsewhere in Illinois

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

Near Walnut Hill

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

Near Walnut Hill

River and lake gauges