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Casey, Illinois

City in Clark County, Illinois

Air quality

The air at Casey

Index 18, good, led by ozone. Read at 1 PM from its reporting area, Terre Haute (IN), 34 miles off.

18Good
  • Fine particles (PM2.5)0Good-
  • Ozone18Good-

The days ahead

Highest moderate, Sun Oct 18, led by fine particles. Yesterday measured 52, moderate.

Smoke, the next 43 hours

No smoke near the ground through Sun 7 AM.

FriSatSun

Precipitation

What has fallen at Casey

0.86 in in the last 24 hours, 1.20 in over the last 3 days, to Fri 12 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.86in
Last 3 days
1.20in

Visibility

How far you can see at Casey, the next 43 hours

Visibility stays 9 miles or more through Sun 7 AM, lowest 9 miles Sun 2 AM.

FriSatSun

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

What is measuring near here

The 5 instruments nearest Casey, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.8 miles away.

measured now3 instruments

measured daily2 instruments

CaseyCASI2

At a cooperative observer's station/0.8 mi away/627 ft/19 ft below here

snowfall, snow depth, precip, high, low

Rank1,100of 1,393

Yale 0.1 SSWIL-JS-5

In a volunteer observer's own ground/12.7 mi away/551 ft/95 ft below here

precip, snowfall, snow depth

Rank303of 1,393

Station report

The weather at Mattoon/Charlest, drawn

The nearest airport reporting now, 19.8 mi from Casey, Illinois. From its report of Oct 16, 2026, 12:53 PM local time: 3 of its 6 sheets.

The sky

A few clouds at 3,400 ft, a few clouds at 5,500 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 3,400 feet, a few clouds cloud with its base at 5,500 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 STATION02,5005,0007,50010,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETFEW 5,500 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYFEW 3,400 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYVISIBILITY, 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

The air

57.0 F with a dew point of 42.0 F, 57 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 3,400 ft up; the lowest cloud reported is at 3,400 ft.

Chart of the air at Mattoon/Charlest: temperature 57.0 degrees Fahrenheit and dew point 42.0, 57 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 3,400 feet above the station, against the lowest cloud reported at 3,400 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 STATION01,0002,0003,0004,0005,00030 F40 F50 F60 F70 FSATURATES 3,400 FT ABOVE THE STATION, AT 38.7 FLOWEST CLOUD REPORTED, FEW 3,400 FTTEMPERATURE 57.0 FDEW POINT 42.0 FSPREAD 15.0 FRELATIVE HUMIDITY 57 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 west northwest (300 degrees) at 20 mph, gusting 31 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 300 degrees, the west northwest, at 20 miles an hour, gusting 31; 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 300°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE19NOW, 20 MPH6STRONG BREEZE25GUST, 31 MPH7NEAR GALE328GALE399STRONG 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 Casey (CASI2), 0.8 miles from here, read 16 Oct, 07:30. measured daily

Elsewhere in Illinois

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

Near Casey

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

Near Casey

River and lake gauges