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Janesville, Illinois

Community in Coles County, Illinois

Air quality

The air at Janesville

Index 11, good, led by ozone. Read at 4 AM from its reporting area, Terre Haute (IN), 45 miles off.

11Good
  • Ozone11Good-

The days ahead

Good each day through Today, led by fine particles. Yesterday measured 52, moderate.

Smoke, the next 46 hours

No smoke near the ground through Sun 1 AM.

FriSat

Precipitation

What has fallen at Janesville

0.33 in in the last 24 hours, 0.41 in over the last 3 days, to Fri 3 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.33in
Last 3 days
0.41in

Visibility

How far you can see at Janesville, the next 46 hours

Visibility stays 9 miles or more through Sun 1 AM, lowest 10 miles Fri 5 AM.

FriSat

On the radar over Janesville, IllinoisReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 5 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 now3 instruments

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

Rank31of 1,393

Station report

The weather at Mattoon/Charlest, drawn

The nearest airport reporting now, 7.3 mi from Janesville, Illinois. From its report of Oct 16, 2026, 4:28 AM local time: 3 of its 6 sheets.

The sky

A few clouds at 2,200 ft, broken at 9,000 ft, overcast at 10,000 ft; the ceiling is 9,000 ft; visibility 10 mi or more.

Section of the sky over Mattoon/Charlest, height above the station to scale: a few clouds cloud with its base at 2,200 feet, broken cloud with its base at 9,000 feet, overcast cloud with its base at 10,000 feet, the ceiling at 9,000 feet, 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 STATION02,5005,0007,50010,00012,50015,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FTOVC 10,000 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 9,000 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYFEW 2,200 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYCEILING 9,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEMattoon/Charlest, the skySTATION REPORT · ASOS MTOTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-MTO-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018, FB-SKY-013, FB-SKY-014

The air

53.0 F with a dew point of 48.0 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 2,200 ft.

Chart of the air at Mattoon/Charlest: temperature 53.0 degrees Fahrenheit and dew point 48.0, 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 2,200 feet; 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 1,200 FT ABOVE THE STATION, AT 46.8 FLOWEST CLOUD REPORTED, FEW 2,200 FTTEMPERATURE 53.0 FDEW POINT 48.0 FSPREAD 5.0 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 POINTTITLEMattoon/Charlest, the airSTATION REPORT · ASOS MTOTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-MTO-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northwest (320 degrees) at 20 mph, gusting 35 mph: force 5, a fresh breeze on the Beaufort scale. The strongest gust today was 40 mph.

Plan of the wind at Mattoon/Charlest, north up: blowing from 320 degrees, the northwest, at 20 miles an hour, gusting 35; beside it the Beaufort scale from calm to hurricane force, force 5, fresh breeze, 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 STATIONFROM 320°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE19NOW, 20 MPH6STRONG BREEZE257NEAR GALE32GUST, 35 MPH8GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEMattoon/Charlest, the windSTATION REPORT · ASOS MTOTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-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

0in

Snow on the ground

Measured at Charleston (CRSI2), 8.2 miles from here, read 15 Oct, 18:00. measured daily

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.

Near Janesville

River and lake gauges