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Chemung, Illinois

Community in McHenry County, Illinois

Air quality

The air at Chemung

Index 9, good, led by fine particles. Read at 11 PM from its reporting area, Rockford (IL), 20 miles off.

9Good
  • Fine particles (PM2.5)9Good-
  • Ozone7Good9 ppb19.7 mi

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 27, good.

Smoke, the next 44 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Chemung

0.43 in in the last 24 hours, 0.46 in over the last 3 days, to Thu 11 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.43in
Last 3 days
0.46in

Visibility

How far you can see at Chemung, the next 44 hours

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

FriSat

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

What is measuring near here

The 6 instruments nearest Chemung, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.3 miles away.

measured now4 instruments

RockfordRFD

At an airfield/26.6 mi away/722 ft/177 ft below here

temp, wind, gust, visibility, precip, pressure

Rank338of 1,393

measured daily2 instruments

Harvard WWTPHVDI2

At a water treatment plant/2.0 mi away/915 ft/16 ft above here

snowfall, snow depth, precip, high, low

Rank-

Harvard 0.2 NIL-MCH-42

In a volunteer observer's own ground/2.6 mi away/948 ft/49 ft above here

precip, snowfall, snow depth

Rank-

Station report

The weather at Rockford, drawn

The nearest airport reporting now, 26.6 mi from Chemung, Illinois. From its report of Oct 15, 2026, 11:54 PM local time: 3 of its 6 sheets.

The sky

Broken at 1,800 ft, overcast at 6,500 ft; the ceiling is 1,800 ft; visibility 10 mi or more.

Section of the sky over Rockford, height above the station to scale: broken cloud with its base at 1,800 feet, overcast cloud with its base at 6,500 feet, the ceiling at 1,800 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RFDFIG. A THE SKY OVER ROCKFORDSECTION, 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 SHEETOVC 6,500 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 1,800 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 1,800 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLERockford, the skySTATION REPORT · ASOS RFDTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-RFD-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

55.0 F with a dew point of 50.0 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 1,800 ft.

Chart of the air at Rockford: temperature 55.0 degrees Fahrenheit and dew point 50.0, 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 1,800 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RFDFIG. B THE AIR AT ROCKFORDTHE 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 1,200 FT ABOVE THE STATION, AT 48.9 FLOWEST CLOUD REPORTED, BKN 1,800 FTTEMPERATURE 55.0 FDEW POINT 50.0 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 POINTTITLERockford, the airSTATION REPORT · ASOS RFDTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-RFD-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

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

Plan of the wind at Rockford, north up: blowing from 290 degrees, the west northwest, at 15 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RFDFIG. C THE WIND AT ROCKFORDPLAN, 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 BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLERockford, the windSTATION REPORT · ASOS RFDTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-RFD-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Rockford, 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 Chemung

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

Near Chemung

River and lake gauges