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Johnsburg, Illinois

Village in McHenry County, Illinois

Air quality

The air at Johnsburg

Index 25, good, led by ozone. Read at 5 AM from its reporting area, North and West Suburbs (Chicago) (IL), 13 miles off.

25Good
  • Fine particles (PM2.5)9Good11.7 mi
  • Ozone25Good21 ppb11.7 mi
  • Coarse particles (PM10)2Good-

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 25, good.

Smoke, the next 44 hours

No smoke near the ground through Mon 1 AM.

SatSun

Precipitation

What has fallen at Johnsburg

0.04 in in the last 24 hours, 0.75 in over the last 3 days, to Sat 5 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.04in
Last 3 days
0.75in

Visibility

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

Visibility stays 10 miles or more through Mon 1 AM.

SatSun

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

What is measuring near here

The 6 instruments nearest Johnsburg, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.3 miles away.

measured now4 instruments

WaukeganUGN

At an airfield/19.2 mi away/709 ft/85 ft below here

temp, wind, gust, visibility, precip, pressure

Rank9of 1,419

measured daily2 instruments

Pistakee Highlands 0.4 SWIL-MCH-34

In a volunteer observer's own ground/1.3 mi away/797 ft/3 ft above here

precip, snowfall, snow depth

Rank-

Station report

The weather at Waukegan, drawn

The nearest airport reporting now, 19.2 mi from Johnsburg, Illinois. From its report of Oct 17, 2026, 5:51 AM 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 Waukegan, 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 UGNFIG. A THE SKY OVER WAUKEGANSECTION, 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 MORE0510TITLEWaukegan, the skySTATION REPORT · ASOS UGNTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-17IDSR-UGN-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

36.0 F with a dew point of 30.0 F, 79 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,400 ft up.

Chart of the air at Waukegan: temperature 36.0 degrees Fahrenheit and dew point 30.0, 79 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,400 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT UGNFIG. B THE AIR AT WAUKEGANTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00020 F30 F40 F50 FSATURATES 1,400 FT ABOVE THE STATION, AT 28.7 FTEMPERATURE 36.0 FDEW POINT 30.0 FSPREAD 6.0 FRELATIVE HUMIDITY 79 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 POINTTITLEWaukegan, the airSTATION REPORT · ASOS UGNTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-17IDSR-UGN-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northwest (320 degrees) at 6 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at Waukegan, north up: blowing from 320 degrees, the northwest, at 6 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 2, light breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT UGNFIG. C THE WIND AT WAUKEGANPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 320°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 6 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEWaukegan, the windSTATION REPORT · ASOS UGNTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-17IDSR-UGN-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at McHenry Stratton Lock/Dam (MCHI2), 5.4 miles from here, read 16 Oct, 08:00. measured daily

Elsewhere in Illinois

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

Near Johnsburg

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

Near Johnsburg

River and lake gauges