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Big Rock, Illinois

Village in Kane County, Illinois

Air quality

The air at Big Rock

Index 12, good, led by fine particles. Read at 11 PM from its reporting area, Aurora and Elgin (IL), 7 miles off.

12Good
  • Fine particles (PM2.5)12Good20 mi
  • Ozone9Good7 ppb24.3 mi

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 28, good.

Smoke, the next 44 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Big Rock

0.68 in in the last 24 hours, 0.88 in over the last 3 days, to Thu 11 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.68in
Last 3 days
0.88in

Visibility

How far you can see at Big Rock, the next 44 hours

Visibility stays 8 miles or more through Sat 7 PM, lowest 9 miles Fri 12 AM.

FriSat

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

What is measuring near here

The 7 instruments nearest Big Rock, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.5 miles away.

measured now5 instruments

measured daily2 instruments

Sugar Grove 3.0 SWIL-KN-146

In a volunteer observer's own ground/2.5 mi away/688 ft/16 ft below here

precip, snowfall, snow depth

Rank-

Aurora WaterARRI2

At a cooperative observer's station/12.1 mi away/676 ft/28 ft below here

snowfall, snow depth, precip, high, low

Rank151of 1,393

Station report

The weather at Chicago/Aurora, drawn

The nearest airport reporting now, 3.3 mi from Big Rock, Illinois. From its report of Oct 15, 2026, 11:52 PM local time: 3 of its 6 sheets.

The sky

Scattered at 1,600 ft, broken at 2,500 ft; the ceiling is 2,500 ft; visibility 10 mi or more.

Section of the sky over Chicago/Aurora, height above the station to scale: scattered cloud with its base at 1,600 feet, broken cloud with its base at 2,500 feet, the ceiling at 2,500 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ARRFIG. A THE SKY OVER CHICAGO/AURORASECTION, 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 STATION05001,0001,5002,0002,5003,0003,5004,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETBKN 2,500 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYSCT 1,600 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYCEILING 2,500 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEChicago/Aurora, the skySTATION REPORT · ASOS ARRTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-ARR-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

56.0 F with a dew point of 53.0 F, 90 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 700 ft up; the lowest cloud reported is at 1,600 ft.

Chart of the air at Chicago/Aurora: temperature 56.0 degrees Fahrenheit and dew point 53.0, 90 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 700 feet above the station, against the lowest cloud reported at 1,600 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ARRFIG. B THE AIR AT CHICAGO/AURORATHE 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 F70 FSATURATES 700 FT ABOVE THE STATION, AT 52.3 FLOWEST CLOUD REPORTED, SCT 1,600 FTTEMPERATURE 56.0 FDEW POINT 53.0 FSPREAD 3.0 FRELATIVE HUMIDITY 90 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 POINTTITLEChicago/Aurora, the airSTATION REPORT · ASOS ARRTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-ARR-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west northwest (290 degrees) at 15 mph, gusting 25 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 30 mph.

Plan of the wind at Chicago/Aurora, north up: blowing from 290 degrees, the west northwest, at 15 miles an hour, gusting 25; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ARRFIG. C THE WIND AT CHICAGO/AURORAPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 290°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 15 MPH5FRESH BREEZE196STRONG BREEZE25GUST, 25 MPH7NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEChicago/Aurora, the windSTATION REPORT · ASOS ARRTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-ARR-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Chicago/Aurora, 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 Big Rock

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

Near Big Rock

River and lake gauges