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Dewey, Illinois

Community in Champaign County, Illinois

Air quality

The air at Dewey

Index 9, good, led by ozone. Read at 11 PM from its reporting area, Champaign (IL), 6 miles off.

9Good
  • Fine particles (PM2.5)7Good19 mi
  • Ozone9Good13 ppb7.5 mi

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 42, good.

Smoke, the next 45 hours

No smoke near the ground through Sun 7 PM.

SatSun

Precipitation

What has fallen at Dewey

0.18 in in the last 24 hours, 0.30 in over the last 3 days, to Fri 10 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.18in
Last 3 days
0.30in

Visibility

How far you can see at Dewey, the next 45 hours

Visibility stays 8 miles or more through Sun 7 PM, lowest 8 miles Sat 8 AM.

SatSun

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

What is measuring near here

The 7 instruments nearest Dewey, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.0 miles away.

measured now5 instruments

RantoulTIP

At an airfield/7.7 mi away/738 ft/10 ft above here

temp, wind, gust, visibility, precip, pressure

Rank518of 1,419

measured daily2 instruments

Sangamon River AT FisherFISI2

At a cooperative observer's station/2.0 mi away/709 ft/19 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Rantoul, drawn

The nearest airport reporting now, 7.7 mi from Dewey, Illinois. From its report of Oct 16, 2026, 11:15 PM 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 Rantoul, 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 TIPFIG. A THE SKY OVER RANTOULSECTION, 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 MORE0510TITLERantoul, the skySTATION REPORT · ASOS TIPTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-17IDSR-TIP-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

45.0 F with a dew point of 40.6 F, 84 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,000 ft up.

Chart of the air at Rantoul: temperature 45.0 degrees Fahrenheit and dew point 40.6, 84 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,000 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT TIPFIG. B THE AIR AT RANTOULTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00030 F40 F50 F60 FSATURATES 1,000 FT ABOVE THE STATION, AT 39.6 FTEMPERATURE 45.0 FDEW POINT 40.6 FSPREAD 4.4 FRELATIVE HUMIDITY 84 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 POINTTITLERantoul, the airSTATION REPORT · ASOS TIPTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-17IDSR-TIP-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north northwest (340 degrees) at 12 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 35 mph.

Plan of the wind at Rantoul, north up: blowing from 340 degrees, the north northwest, at 12 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT TIPFIG. C THE WIND AT RANTOULPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 340°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 12 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLERantoul, the windSTATION REPORT · ASOS TIPTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-17IDSR-TIP-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

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Snow on the ground

Elsewhere in Illinois

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

Near Dewey

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

Near Dewey

River and lake gauges