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Dahlgren, Illinois

Village in Hamilton County, Illinois

Air quality

The air at Dahlgren

Index 31, good, led by fine particles. Read at 4 AM from its reporting area, Evansville (IN), 62 miles off.

31Good
  • Fine particles (PM2.5)31Good-
  • Ozone23Good-
  • Coarse particles (PM10)10Good-

The days ahead

Good each day through Today, led by fine particles. Yesterday measured 51, moderate.

Smoke, the next 46 hours

No smoke near the ground through Sun 1 AM.

FriSat

Precipitation

What has fallen at Dahlgren

0.15 in in the last 24 hours, 1.00 in over the last 3 days, to Fri 3 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.15in
Last 3 days
1.00in

Visibility

How far you can see at Dahlgren, the next 46 hours

Visibility stays 9 miles or more through Sun 1 AM, lowest 10 miles Fri 7 AM.

FriSat

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

What is measuring near here

The 6 instruments nearest Dahlgren, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 4.6 miles away.

measured now4 instruments

measured daily2 instruments

WaltonvilleWLTI2

At a cooperative observer's station/19.0 mi away/443 ft/76 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Mount Vernon, drawn

The nearest airport reporting now, 12.7 mi from Dahlgren, Illinois. From its report of Oct 16, 2026, 3:56 AM local time: 3 of its 6 sheets.

The sky

Overcast at 2,100 ft; the ceiling is 2,100 ft; visibility 10 mi or more.

Section of the sky over Mount Vernon, height above the station to scale: overcast cloud with its base at 2,100 feet, the ceiling at 2,100 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MVNFIG. A THE SKY OVER MOUNT VERNONSECTION, 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 STATION05001,0001,5002,0002,5003,0003,500ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 2,100 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 2,100 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEMount Vernon, the skySTATION REPORT · ASOS MVNTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-MVN-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

57.0 F with a dew point of 50.0 F, 77 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,600 ft up; the lowest cloud reported is at 2,100 ft.

Chart of the air at Mount Vernon: temperature 57.0 degrees Fahrenheit and dew point 50.0, 77 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,600 feet above the station, against the lowest cloud reported at 2,100 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MVNFIG. B THE AIR AT MOUNT VERNONTHE 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 1,600 FT ABOVE THE STATION, AT 48.4 FLOWEST CLOUD REPORTED, OVC 2,100 FTTEMPERATURE 57.0 FDEW POINT 50.0 FSPREAD 7.0 FRELATIVE HUMIDITY 77 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 POINTTITLEMount Vernon, the airSTATION REPORT · ASOS MVNTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-MVN-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

At 5 mph: force 2, a light breeze on the Beaufort scale. The strongest gust today was 24 mph.

Plan of the wind at Mount Vernon, north up: at 5 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 MVNFIG. C THE WIND AT MOUNT VERNONPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONDIRECTION NOT REPORTEDBEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 5 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEMount Vernon, the windSTATION REPORT · ASOS MVNTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-MVN-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Waltonville (WLTI2), 19.0 miles from here, read 15 Oct, 14:00. measured daily

Elsewhere in Illinois

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

Near Dahlgren

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

Near Dahlgren

River and lake gauges