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Crystal Lake, Illinois

City in McHenry County, Illinois

Air quality

The air at Crystal Lake

Index 26, good, led by fine particles. Read at 1 PM from its reporting area, North and West Suburbs (Chicago) (IL), 5 miles off.

26Good
  • Fine particles (PM2.5)26Good5.1 mi
  • Ozone19Good26 ppb5.1 mi
  • Coarse particles (PM10)6Good-

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 32, good.

Smoke, the next 43 hours

No smoke near the ground through Sun 7 AM.

FriSatSun

Precipitation

What has fallen at Crystal Lake

0.40 in in the last 24 hours, 0.98 in over the last 3 days, to Fri 12 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.40in
Last 3 days
0.98in

Visibility

How far you can see at Crystal Lake, the next 43 hours

Visibility stays 9 miles or more through Sun 7 AM, lowest 9 miles Sat 8 AM.

FriSatSun

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

What is measuring near here

The 7 instruments nearest Crystal Lake, 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

measured daily2 instruments

Crystal Lake 1.6 SWIL-MCH-105

In a volunteer observer's own ground/0.7 mi away/896 ft/5 ft above here

precip, snowfall, snow depth

Rank-

Crystal Lake 4NWCRYI2

At a cooperative observer's station/4.0 mi away/932 ft/41 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Chicago - Schaumburg, drawn

The nearest airport reporting now, 19.9 mi from Crystal Lake, Illinois. From its report of Oct 16, 2026, 1:15 PM local time: 3 of its 6 sheets.

The sky

Scattered at 2,300 ft, scattered at 3,300 ft, broken at 5,500 ft; the ceiling is 5,500 ft; visibility 10 mi or more.

Section of the sky over Chicago - Schaumburg, height above the station to scale: scattered cloud with its base at 2,300 feet, scattered cloud with its base at 3,300 feet, broken cloud with its base at 5,500 feet, the ceiling at 5,500 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 06CFIG. A THE SKY OVER CHICAGO - SCHAUMBURGSECTION, 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 SHEETBKN 5,500 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYSCT 3,300 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYSCT 2,300 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYCEILING 5,500 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEChicago - Schaumburg, the skySTATION REPORT · ASOS 06CTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-06C-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

53.6 F with a dew point of 48.0 F, 81 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,300 ft up; the lowest cloud reported is at 2,300 ft.

Chart of the air at Chicago - Schaumburg: temperature 53.6 degrees Fahrenheit and dew point 48.0, 81 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,300 feet above the station, against the lowest cloud reported at 2,300 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 06CFIG. B THE AIR AT CHICAGO - SCHAUMBURGTHE 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 FSATURATES 1,300 FT ABOVE THE STATION, AT 46.7 FLOWEST CLOUD REPORTED, SCT 2,300 FTTEMPERATURE 53.6 FDEW POINT 48.0 FSPREAD 5.6 FRELATIVE HUMIDITY 81 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 - Schaumburg, the airSTATION REPORT · ASOS 06CTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-06C-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north northwest (340 degrees) at 12 mph, gusting 18 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 28 mph.

Plan of the wind at Chicago - Schaumburg, north up: blowing from 340 degrees, the north northwest, at 12 miles an hour, gusting 18; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 06CFIG. C THE WIND AT CHICAGO - SCHAUMBURGPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 340°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 12 MPH4MODERATE BREEZE13GUST, 18 MPH5FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEChicago - Schaumburg, the windSTATION REPORT · ASOS 06CTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-06C-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Chicago - Schaumburg, 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 Crystal Lake

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

Near Crystal Lake

River and lake gauges