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St. Elmo, Illinois

City in Fayette County, Illinois

Air quality

The air at St. Elmo

Index 14, good, led by ozone. Read at 3 AM from its reporting area, Decatur (IL), 58 miles off.

14Good
  • Fine particles (PM2.5)10Good-
  • Ozone14Good10 ppb16.4 mi

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 36, good.

Smoke, the next 41 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at St. Elmo

0.91 in in the last 24 hours, 1.20 in over the last 3 days, to Fri 2 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.91in
Last 3 days
1.20in

Visibility

How far you can see at St. Elmo, the next 41 hours

Visibility stays 5 miles or more through Sat 7 PM, lowest 6 miles Fri 6 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest St. Elmo, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.3 miles away.

measured now4 instruments

Effingham1H2

At an airfield/17.3 mi away/587 ft/33 ft below here

temp, wind, gust, visibility, precip, pressure

Rank629of 1,393

FloraFOAI2

At a river or reservoir gauge/32.2 mi away/490 ft/130 ft below here

temp, wind, gust, humidity, pressure

Rank888of 1,393

measured daily2 instruments

Station report

The weather at Effingham, drawn

The nearest airport reporting now, 17.3 mi from St. Elmo, Illinois. From its report of Oct 16, 2026, 3:35 AM local time: 3 of its 6 sheets.

The sky

Overcast at 2,000 ft; the ceiling is 2,000 ft; visibility 10 mi or more.

Section of the sky over Effingham, height above the station to scale: overcast cloud with its base at 2,000 feet, the ceiling at 2,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 1H2FIG. A THE SKY OVER EFFINGHAMSECTION, 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 STATION05001,0001,5002,0002,5003,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 2,000 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 2,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEEffingham, the skySTATION REPORT · ASOS 1H2TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-1H2-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

54.7 F with a dew point of 49.5 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 2,000 ft.

Chart of the air at Effingham: temperature 54.7 degrees Fahrenheit and dew point 49.5, 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 2,000 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 1H2FIG. B THE AIR AT EFFINGHAMTHE 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 48.3 FLOWEST CLOUD REPORTED, OVC 2,000 FTTEMPERATURE 54.7 FDEW POINT 49.5 FSPREAD 5.2 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 POINTTITLEEffingham, the airSTATION REPORT · ASOS 1H2TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-1H2-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west (280 degrees) at 21 mph, gusting 32 mph: force 5, a fresh breeze on the Beaufort scale. The strongest gust today was 33 mph.

Plan of the wind at Effingham, north up: blowing from 280 degrees, the west, at 21 miles an hour, gusting 32; beside it the Beaufort scale from calm to hurricane force, force 5, fresh breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 1H2FIG. C THE WIND AT EFFINGHAMPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 280°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE19NOW, 21 MPH6STRONG BREEZE257NEAR GALE32GUST, 32 MPH8GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEEffingham, the windSTATION REPORT · ASOS 1H2TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-1H2-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Beecher City (BEEI2), 11.3 miles from here, read 15 Oct, 08:00. measured daily

Elsewhere in Illinois

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

Near St. Elmo

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

Near St. Elmo

River and lake gauges