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Sycamore, Illinois

City in DeKalb County, Illinois

Air quality

The air at Sycamore

Index 16, good, led by fine particles. Read at 10 PM from its reporting area, Aurora and Elgin (IL), 18 miles off.

16Good
  • Fine particles (PM2.5)16Good-
  • Ozone9Good-

The days ahead

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

Smoke, the next 45 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Sycamore

0.32 in in the last 24 hours, 0.43 in over the last 3 days, to Thu 10 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.32in
Last 3 days
0.43in

Visibility

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

Visibility stays 6 miles or more through Sat 7 PM, lowest 6 miles Fri 3 PM.

FriSat

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

What is measuring near here

The 7 instruments nearest Sycamore, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.7 miles away.

measured now5 instruments

De KalbDKB

At an airfield/3.7 mi away/915 ft/55 ft above here

temp, wind, gust, visibility, precip, pressure

Rank411of 1,393

ShabbonaSBNI2

At a river or reservoir gauge/12.9 mi away/863 ft/3 ft above here

temp, wind, gust, humidity, pressure

Rank558of 1,393

measured daily2 instruments

Sycamore 0.4 WSWIL-DK-41

In a volunteer observer's own ground/0.8 mi away/881 ft/21 ft above here

precip, snowfall, snow depth

Rank-

Station report

The weather at De Kalb, drawn

The nearest airport reporting now, 3.7 mi from Sycamore, Illinois. From its report of Oct 15, 2026, 10:55 PM local time: 3 of its 6 sheets.

The sky

Broken at 1,400 ft, overcast at 2,100 ft; the ceiling is 1,400 ft; visibility 10 mi or more.

Section of the sky over De Kalb, height above the station to scale: broken cloud with its base at 1,400 feet, overcast cloud with its base at 2,100 feet, the ceiling at 1,400 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DKBFIG. A THE SKY OVER DE KALBSECTION, 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 STATION05001,0001,5002,0002,5003,0003,500ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 2,100 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 1,400 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 1,400 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEDe Kalb, the skySTATION REPORT · ASOS DKBTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-DKB-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

55.8 F with a dew point of 54.5 F, 95 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 300 ft up; the lowest cloud reported is at 1,400 ft.

Chart of the air at De Kalb: temperature 55.8 degrees Fahrenheit and dew point 54.5, 95 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 300 feet above the station, against the lowest cloud reported at 1,400 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DKBFIG. B THE AIR AT DE KALBTHE 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 300 FT ABOVE THE STATION, AT 54.1 FLOWEST CLOUD REPORTED, BKN 1,400 FTTEMPERATURE AND DEW POINT 55.8 F, 54.5 FRELATIVE HUMIDITY 95 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 POINTTITLEDe Kalb, the airSTATION REPORT · ASOS DKBTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-DKB-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 22 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 26 mph.

Plan of the wind at De Kalb, north up: blowing from 290 degrees, the west northwest, at 15 miles an hour, gusting 22; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DKBFIG. C THE WIND AT DE KALBPLAN, 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 BREEZE19GUST, 22 MPH6STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEDe Kalb, the windSTATION REPORT · ASOS DKBTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-DKB-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of De Kalb, 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 Sycamore

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

Near Sycamore

River and lake gauges