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St. Johns, Illinois

Village in Perry County, Illinois

Air quality

The air at St. Johns

Index 15, good, led by ozone. Read at 1 AM from its reporting area, Farrar (MO), 34 miles off.

15Good
  • Ozone15Good-

Smoke, the next 42 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at St. Johns

0.28 in in the last 24 hours, 1.15 in over the last 3 days, to Fri 1 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.28in
Last 3 days
1.15in

Visibility

How far you can see at St. Johns, the next 42 hours

Visibility stays 10 miles or more through Sat 7 PM.

FriSat

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

What is measuring near here

The 5 instruments nearest St. Johns, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.2 miles away.

measured now3 instruments

measured daily2 instruments

Du QuoinDUQI2

At a cooperative observer's station/2.2 mi away/443 ft/16 ft below here

snowfall, snow depth, precip, high, low

Rank-

Du Quoin 0.9 ESEIL-PY-3

In a volunteer observer's own ground/2.3 mi away/446 ft/13 ft below here

precip, snowfall, snow depth

Rank-

Station report

The weather at Carbondale/Murph, drawn

The nearest airport reporting now, 17.3 mi from St. Johns, Illinois. From its report of Oct 16, 2026, 12:52 AM local time: 3 of its 6 sheets.

The sky

Scattered at 2,100 ft, broken at 2,800 ft, overcast at 5,500 ft; the ceiling is 2,800 ft; visibility 10 mi or more.

Section of the sky over Carbondale/Murph, height above the station to scale: scattered cloud with its base at 2,100 feet, broken cloud with its base at 2,800 feet, overcast cloud with its base at 5,500 feet, the ceiling at 2,800 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MDHFIG. A THE SKY OVER CARBONDALE/MURPHSECTION, 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 STATION02,5005,0007,50010,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 5,500 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 2,800 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYSCT 2,100 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYCEILING 2,800 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLECarbondale/Murph, the skySTATION REPORT · ASOS MDHTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-MDH-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

73.0 F with a dew point of 67.0 F, 81 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,400 ft up; the lowest cloud reported is at 2,100 ft.

Chart of the air at Carbondale/Murph: temperature 73.0 degrees Fahrenheit and dew point 67.0, 81 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,400 feet above the station, against the lowest cloud reported at 2,100 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MDHFIG. B THE AIR AT CARBONDALE/MURPHTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00050 F60 F70 F80 FSATURATES 1,400 FT ABOVE THE STATION, AT 65.6 FLOWEST CLOUD REPORTED, SCT 2,100 FTTEMPERATURE 73.0 FDEW POINT 67.0 FSPREAD 6.0 FRELATIVE HUMIDITY 81 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 POINTTITLECarbondale/Murph, the airSTATION REPORT · ASOS MDHTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-MDH-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west northwest (290 degrees) at 14 mph, gusting 23 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 32 mph.

Plan of the wind at Carbondale/Murph, north up: blowing from 290 degrees, the west northwest, at 14 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 MDHFIG. C THE WIND AT CARBONDALE/MURPHPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 290°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 14 MPH5FRESH BREEZE19GUST, 23 MPH6STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLECarbondale/Murph, the windSTATION REPORT · ASOS MDHTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-MDH-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Du Quoin (DUQI2), 2.2 miles from here, read 14 Oct, 22:00. measured daily

Elsewhere in Illinois

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

Near St. Johns

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

Near St. Johns

River and lake gauges