Storm Station
Janesville, Illinois
57°
Mostly clear· Feels like 57°·Light air 2 mph ENE
Mostly clear, with a low around 50. East northeast wind around 3 mph.
-UV
-Air quality
81%Humidity
24%Cloud

What is measuring near here

The 3 instruments nearest Janesville, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 4.0 miles away.

measured now1 instrument

Mattoon/CharlestMTO

At an airfield/7.3 mi away/702 ft/13 ft above here

temp, wind, gust, visibility, precip, pressure

Rank8of 417

measured daily2 instruments

Charleston 4.7 SSWIL-CE-8

In a volunteer observer's own ground/4.0 mi away/595 ft/94 ft below here

precip, snowfall, snow depth

Rank-

CharlestonCRSI2

At a cooperative observer's station/8.2 mi away/705 ft/16 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Mattoon/Charlest, drawn

The nearest airport reporting now, 7.3 mi from Janesville. From its report of Sep 27, 2026, 4:53 AM local time: 3 of its 6 sheets.

The sky

No cloud below 12,000 ft; visibility 10 mi or more.

Section of the sky over Mattoon/Charlest, height above the station to scale: no cloud detected below 12,000 feet, the reach of its ceilometer, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MTOFIG. A THE SKY OVER MATTOON/CHARLESTSECTION, 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 SHEETNO CLOUD DETECTED BELOW 12,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEMattoon/Charlest, the skySTATION REPORT · ASOS MTOTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-09-27IDSR-MTO-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

51.0 F with a dew point of 47.0 F, 86 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 900 ft up.

Chart of the air at Mattoon/Charlest: temperature 51.0 degrees Fahrenheit and dew point 47.0, 86 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 900 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MTOFIG. B THE AIR AT MATTOON/CHARLESTTHE 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 FSATURATES 900 FT ABOVE THE STATION, AT 46.1 FTEMPERATURE 51.0 FDEW POINT 47.0 FSPREAD 4.0 FRELATIVE HUMIDITY 86 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 POINTTITLEMattoon/Charlest, the airSTATION REPORT · ASOS MTOTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-09-27IDSR-MTO-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 Mattoon/Charlest, 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 MTOFIG. C THE WIND AT MATTOON/CHARLESTPLAN, 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 FORCE73TITLEMattoon/Charlest, the windSTATION REPORT · ASOS MTOTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-09-27IDSR-MTO-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

-in

Snow on the ground

Elsewhere in Illinois

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

Near Janesville

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