Storm Station
St. Johns, Illinois
60° 77°/58°
Clear· Feels like 60°·Light air 3 mph NE
Mostly cloudy, with a low around 58. Northeast wind around 1 mph.
0UV Low
-Air quality
88%Humidity
12%Cloud
Now
3:15 AM
60feels60
now, clear
Today
Sep 27
7758
overcast
Mon
Sep 28
8056
overcast
Tue
Sep 29
8857
overcast
Wed
Sep 30
9464
17mph
overcast
Thu
Oct 1
8669
43%
14mph
showers light
Fri
Oct 2
7055
43%
14mph
rain light
Sat
Oct 3
6255
40%
13mph
drizzle dense
60°
77°58°
80°56°
88°57°
94°64°
86°69°
70°55°
62°55°

As of 3:15 AM in St. Johns, Illinois.

What is measuring near here

The 4 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 now2 instruments

Carbondale/MurphMDH

At an airfield/17.3 mi away/427 ft/32 ft below here

temp, wind, gust, visibility, precip, pressure

Rank416of 417

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 Big Muddy Subimpoundment AT Big Muddy Subimpoundment, drawn

The nearest instrument reporting now, 16.2 mi from St. Johns. From its report of Sep 27, 2026, 3:00 AM local time: 3 of its 5 sheets.

The air

62.6 F with a dew point of 57.4 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.

Chart of the air at Big Muddy Subimpoundment AT Big Muddy Subimpoundment: temperature 62.6 degrees Fahrenheit and dew point 57.4, 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; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BSII2FIG. B THE AIR AT BIG MUDDY SUBIMPOUNDMENT AT BIG MUDDY SUBIMPOUNDMENTTHE 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 FSATURATES 1,200 FT ABOVE THE STATION, AT 56.1 FTEMPERATURE 62.6 FDEW POINT 57.4 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 POINTTITLEBig Muddy Subimpoundment AT Big Muddy Subimpoundment, the airSTATION REPORT · DCP BSII2TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 5DATE2026-09-27IDSR-BSII2-1DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north (0 degrees) at 2 mph: force 1, a light air on the Beaufort scale.

Plan of the wind at Big Muddy Subimpoundment AT Big Muddy Subimpoundment, north up: blowing from 0 degrees, the north, at 2 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 1, light air, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BSII2FIG. C THE WIND AT BIG MUDDY SUBIMPOUNDMENT AT BIG MUDDY SUBIMPOUNDMENTPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 0°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 2 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEBig Muddy Subimpoundment AT Big Muddy Subimpoundment, the windSTATION REPORT · DCP BSII2TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 2 of 5DATE2026-09-27IDSR-BSII2-2DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008

The column

At 404 ft above sea level, 1 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.49 inHg and the temperature at 57.6 F; it reports 62.6 F, 5.0 F warmer than standard.

Section from sea level of where Big Muddy Subimpoundment AT Big Muddy Subimpoundment stands in the atmosphere, height to scale: the station 404 feet above sea level with 1 per cent of the air below it; the standard atmosphere's pressure there, 29.49 inches of mercury, and temperature, 57.6 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BSII2FIG. D WHERE BIG MUDDY SUBIMPOUNDMENT AT BIG MUDDY SUBIMPOUNDMENT STANDS IN THE ATMOSPHERESECTION FROM SEA LEVEL, HEIGHT TO SCALE, THE STATION IN THE STANDARD ATMOSPHEREFT ABOVE SEA LEVEL05,00010,00015,000SEA LEVEL, 29.92 inHg IN THE STANDARD ATMOSPHEREBIG MUDDY SUBIMPOUNDMENT AT BIG MUDDY SUBIMPOUNDMENT1 PER CENT OF THE AIR BELOW IT404 FT10 PER CENT OF THE AIR BELOW, 2,890 FT20 PER CENT OF THE AIR BELOW, 6,050 FT30 PER CENT OF THE AIR BELOW, 9,540 FT40 PER CENT OF THE AIR BELOW, 13,470 FTSTANDARD PRESSURE HERE29.49 inHgSTANDARD TEMPERATURE HERE57.6 FTEMPERATURE, REPORTED62.6 FTITLEBig Muddy Subimpoundment AT Big Muddy Subimpoundment, the columnSTATION REPORT · DCP BSII2TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 3 of 5DATE2026-09-27IDSR-BSII2-3DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The full report of Big Muddy Subimpoundment AT Big Muddy Subimpoundment, in 5 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 19 Sep, 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.