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St. John, Indiana

Town in Lake County, Indiana

Air quality

The air at St. John

Index 31, good, led by coarse particles. Read at 11 PM from its reporting area, Hammond-Gary (IN), 11 miles off.

31Good
  • Fine particles (PM2.5)17Good17.5 mi
  • Ozone26Good15 ppb20.9 mi
  • Coarse particles (PM10)31Good-

The days ahead

Highest moderate, Sun Oct 18, led by ozone. Yesterday measured 28, good.

Smoke, the next 45 hours

No smoke near the ground through Sun 7 PM.

SatSun

Precipitation

What has fallen at St. John

0.06 in in the last 24 hours, 0.31 in over the last 3 days, to Fri 10 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.06in
Last 3 days
0.31in

Visibility

How far you can see at St. John, the next 45 hours

Visibility stays 10 miles or more through Sun 7 PM.

SatSun

On the radar over St. John, IndianaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest St. John, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.4 miles away.

measured now4 instruments

measured daily2 instruments

Crown Point 1NCRPI3

At a cooperative observer's station/6.2 mi away/699 ft/2 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Gary Regional, drawn

The nearest airport reporting now, 12.4 mi from St. John, Indiana. From its report of Oct 16, 2026, 9:50 PM local time: 3 of its 6 sheets.

The sky

Scattered at 3,500 ft, broken at 4,400 ft; the ceiling is 4,400 ft; visibility 10 mi or more.

Section of the sky over Gary Regional, height above the station to scale: scattered cloud with its base at 3,500 feet, broken cloud with its base at 4,400 feet, the ceiling at 4,400 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT GYYFIG. A THE SKY OVER GARY REGIONALSECTION, 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 STATION01,0002,0003,0004,0005,0006,0007,000ETAGESLOWMIDDLETHE STATIONBKN 4,400 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYSCT 3,500 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYCEILING 4,400 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEGary Regional, the skySTATION REPORT · ASOS GYYTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-17IDSR-GYY-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

51.8 F with a dew point of 41.0 F, 66 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,500 ft up; the lowest cloud reported is at 3,500 ft.

Chart of the air at Gary Regional: temperature 51.8 degrees Fahrenheit and dew point 41.0, 66 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,500 feet above the station, against the lowest cloud reported at 3,500 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT GYYFIG. B THE AIR AT GARY REGIONALTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,00030 F40 F50 F60 FSATURATES 2,500 FT ABOVE THE STATION, AT 38.6 FLOWEST CLOUD REPORTED, SCT 3,500 FTTEMPERATURE 51.8 FDEW POINT 41.0 FSPREAD 10.8 FRELATIVE HUMIDITY 66 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 POINTTITLEGary Regional, the airSTATION REPORT · ASOS GYYTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-17IDSR-GYY-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north (360 degrees) at 30 mph, gusting 41 mph: force 6, a strong breeze on the Beaufort scale. The strongest gust today was 52 mph.

Plan of the wind at Gary Regional, north up: blowing from 360 degrees, the north, at 30 miles an hour, gusting 41; beside it the Beaufort scale from calm to hurricane force, force 6, strong breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT GYYFIG. C THE WIND AT GARY REGIONALPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 360°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE25NOW, 30 MPH7NEAR GALE328GALE39GUST, 41 MPH9STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEGary Regional, the windSTATION REPORT · ASOS GYYTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-17IDSR-GYY-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

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Snow on the ground

Elsewhere in Indiana

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

Near St. John

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

Near St. John

River and lake gauges