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Harmony, Illinois

Community in McHenry County, Illinois

Air quality

The air at Harmony

Index 23, good, led by fine particles. Read at 11 PM from its reporting area, North and West Suburbs (Chicago) (IL), 14 miles off.

23Good
  • Fine particles (PM2.5)23Good14.9 mi
  • Ozone15Good11 ppb14.9 mi
  • Coarse particles (PM10)6Good-

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 36, good.

Smoke, the next 44 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Harmony

0.44 in in the last 24 hours, 0.71 in over the last 3 days, to Thu 10 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.44in
Last 3 days
0.71in

Visibility

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

Visibility stays 7 miles or more through Sat 7 PM, lowest 8 miles Fri 3 PM.

FriSat

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

What is measuring near here

The 7 instruments nearest Harmony, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.1 miles away.

measured now5 instruments

De KalbDKB

At an airfield/18.3 mi away/915 ft/7 ft below here

temp, wind, gust, visibility, precip, pressure

Rank411of 1,393

measured daily2 instruments

Marengo 6.5 SSEIL-MCH-112

In a volunteer observer's own ground/1.1 mi away/908 ft/14 ft below here

precip, snowfall, snow depth

Rank-

Crystal Lake 4NWCRYI2

At a cooperative observer's station/9.5 mi away/932 ft/10 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at De Kalb, drawn

The nearest airport reporting now, 18.3 mi from Harmony, Illinois. From its report of Oct 15, 2026, 11:35 PM local time: 3 of its 6 sheets.

The sky

Scattered at 1,000 ft, broken at 1,900 ft, overcast at 2,400 ft; the ceiling is 1,900 ft; visibility 10 mi or more.

Section of the sky over De Kalb, height above the station to scale: scattered cloud with its base at 1,000 feet, broken cloud with its base at 1,900 feet, overcast cloud with its base at 2,400 feet, the ceiling at 1,900 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 STATION05001,0001,5002,0002,5003,0003,5004,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 2,400 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 1,900 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYSCT 1,000 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYCEILING 1,900 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

54.7 F with a dew point of 53.0 F, 94 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 400 ft up; the lowest cloud reported is at 1,000 ft.

Chart of the air at De Kalb: temperature 54.7 degrees Fahrenheit and dew point 53.0, 94 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 400 feet above the station, against the lowest cloud reported at 1,000 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 400 FT ABOVE THE STATION, AT 52.6 FLOWEST CLOUD REPORTED, SCT 1,000 FTTEMPERATURE AND DEW POINT 54.7 F, 53.0 FRELATIVE HUMIDITY 94 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 18 mph, gusting 25 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 28 mph.

Plan of the wind at De Kalb, north up: blowing from 290 degrees, the west northwest, at 18 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 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, 18 MPH5FRESH BREEZE196STRONG BREEZE25GUST, 25 MPH7NEAR 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 Harmony

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

Near Harmony

River and lake gauges