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Freeport, Illinois

City in Stephenson County, Illinois

Air quality

The air at Freeport

Index 9, good, led by fine particles. Read at 5 AM from its reporting area, Rockford (IL), 31 miles off.

9Good
  • Fine particles (PM2.5)9Good-
  • Ozone6Good-

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 20, good.

Smoke, the next 44 hours

No smoke near the ground through Mon 1 AM.

SatSun

Precipitation

What has fallen at Freeport

None in the last 24 hours; 0.32 in over the last 3 days, to Sat 5 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.32in

Visibility

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

Visibility stays 9 miles or more through Mon 1 AM, lowest 9 miles Sat 6 AM.

SatSun

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

What is measuring near here

The 6 instruments nearest Freeport, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.5 miles away.

measured now4 instruments

FreeportFEP

At an airfield/4.2 mi away/860 ft/37 ft above here

temp, wind, gust, visibility, precip, pressure

Rank10of 1,419

measured daily2 instruments

Freeport 0.4 EIL-SP-24

In a volunteer observer's own ground/0.5 mi away/779 ft/44 ft below here

precip, snowfall, snow depth

Rank-

FreeportFEEI2

At a cooperative observer's station/1.1 mi away/771 ft/52 ft below here

snowfall, snow depth, precip, high, low

Rank143of 1,419

Station report

The weather at Freeport, drawn

The nearest airport reporting now, 4.2 mi from Freeport, Illinois. From its report of Oct 17, 2026, 6:15 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 Freeport, 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 FEPFIG. A THE SKY OVER FREEPORTSECTION, 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 MORE0510TITLEFreeport, the skySTATION REPORT · ASOS FEPTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-17IDSR-FEP-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

32.0 F with a dew point of 31.0 F, 96 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 200 ft up.

Chart of the air at Freeport: temperature 32.0 degrees Fahrenheit and dew point 31.0, 96 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 200 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT FEPFIG. B THE AIR AT FREEPORTTHE 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 FSATURATES 200 FT ABOVE THE STATION, AT 30.7 FTEMPERATURE AND DEW POINT 32.0 F, 31.0 FRELATIVE HUMIDITY 96 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 POINTTITLEFreeport, the airSTATION REPORT · ASOS FEPTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-17IDSR-FEP-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Freeport, north up: calm; beside it the Beaufort scale from calm to hurricane force, force 0, calm, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT FEPFIG. C THE WIND AT FREEPORTPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONCALMBEAUFORT FORCELEAST WIND, MPH0CALM0NOW, 0 MPH1LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEFreeport, the windSTATION REPORT · ASOS FEPTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-17IDSR-FEP-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Freeport (FEEI2), 1.1 miles from here, read 16 Oct, 07:00. measured daily

Elsewhere in Illinois

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

Near Freeport

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

Near Freeport

River and lake gauges