Storm Station
Jerseyville, Illinois
59°
Partly cloudy· Feels like 59°·Light air 2 mph E
A slight chance of rain showers. Mostly cloudy, with a low around 57. Wind around 0 mph. Chance of precipitation is 20%.
-UV
-Air quality
87%Humidity
43%Cloud

What is measuring near here

The 4 instruments nearest Jerseyville, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.8 miles away.

measured now2 instruments

Mississippi River At Alton IlALOI2

At a river or reservoir gauge/17.9 mi away/423 ft/235 ft below here

temp, wind, gust, humidity, pressure

Rank308of 417

Alton/St Louis RALN

At an airfield/22.0 mi away/545 ft/113 ft below here

temp, wind, gust, visibility, precip, pressure

Rank414of 417

measured daily2 instruments

JerseyvilleJVLI2

At a cooperative observer's station/1.8 mi away/610 ft/48 ft below here

snowfall, snow depth, precip, high, low

Rank-

Jerseyville 3.4 SWIL-JR-3

In a volunteer observer's own ground/3.3 mi away/605 ft/53 ft below here

precip, snowfall, snow depth

Rank-

Station report

The weather at Alton/St Louis R, drawn

The nearest airport reporting now, 22.0 mi from Jerseyville. From its report of Sep 27, 2026, 4:35 AM local time: 3 of its 6 sheets.

The sky

Scattered at 8,000 ft, scattered at 9,500 ft, scattered at 12,000 ft; visibility 10 mi or more.

Section of the sky over Alton/St Louis R, height above the station to scale: scattered cloud with its base at 8,000 feet, scattered cloud with its base at 9,500 feet, scattered cloud with its base at 12,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ALNFIG. A THE SKY OVER ALTON/ST LOUIS RSECTION, 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 STATION02,5005,0007,50010,00012,50015,00017,50020,000ETAGESLOWMIDDLEHIGHTHE STATIONTHE CEILOMETER READS TO 12,000 FTSCT 12,000 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYSCT 9,500 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYSCT 8,000 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYVISIBILITY, MILES: 10 MI OR MORE0510TITLEAlton/St Louis R, the skySTATION REPORT · ASOS ALNTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-09-27IDSR-ALN-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-013, FB-SKY-014

The air

59.0 F with a dew point of 55.4 F, 88 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 800 ft up; the lowest cloud reported is at 8,000 ft.

Chart of the air at Alton/St Louis R: temperature 59.0 degrees Fahrenheit and dew point 55.4, 88 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 800 feet above the station, against the lowest cloud reported at 8,000 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ALNFIG. B THE AIR AT ALTON/ST LOUIS RTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,00040 F50 F60 F70 FSATURATES 800 FT ABOVE THE STATION, AT 54.6 FABOVE THIS SHEET: LOWEST CLOUD REPORTED, SCT 8,000 FTTEMPERATURE 59.0 FDEW POINT 55.4 FSPREAD 3.6 FRELATIVE HUMIDITY 88 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 POINTTITLEAlton/St Louis R, the airSTATION REPORT · ASOS ALNTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-09-27IDSR-ALN-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Alton/St Louis R, north up: calm; beside it the Beaufort scale from calm to hurricane force, force 0, calm, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ALNFIG. C THE WIND AT ALTON/ST LOUIS RPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONCALMBEAUFORT FORCELEAST WIND, MPH0CALM0NOW, 0 MPH1LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEAlton/St Louis R, the windSTATION REPORT · ASOS ALNTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-09-27IDSR-ALN-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Alton/St Louis R, in 6 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at Jerseyville (JVLI2), 1.8 miles from here, read 25 Sep, 07:00. measured daily

Elsewhere in Illinois

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

Near Jerseyville

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