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Caledonia, Illinois

Village in Boone County, Illinois

Air quality

The air at Caledonia

Index 10, good, led by fine particles. Read at 5 AM from its reporting area, Rockford (IL), 8 miles off.

10Good
  • Fine particles (PM2.5)10Good-
  • Ozone10Good2 ppb7.9 mi

The days ahead

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

Smoke, the next 45 hours

No smoke near the ground through Mon 1 AM.

SatSun

Precipitation

What has fallen at Caledonia

0.02 in in the last 24 hours, 0.30 in over the last 3 days, to Sat 4 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.02in
Last 3 days
0.30in

Visibility

How far you can see at Caledonia, the next 45 hours

Visibility stays 9 miles or more through Mon 1 AM, lowest 10 miles Sat 6 AM.

SatSun

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

What is measuring near here

The 7 instruments nearest Caledonia, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.1 miles away.

measured now5 instruments

RockfordRFD

At an airfield/15.7 mi away/722 ft/223 ft below here

temp, wind, gust, visibility, precip, pressure

Rank12of 1,419

measured daily2 instruments

Poplar Grove 3.2 WSWIL-BN-3

In a volunteer observer's own ground/1.1 mi away/912 ft/33 ft below here

precip, snowfall, snow depth

Rank-

Belvidere 1WBELI2

At a cooperative observer's station/8.0 mi away/751 ft/194 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Rockford, drawn

The nearest airport reporting now, 15.7 mi from Caledonia, Illinois. From its report of Oct 17, 2026, 4:54 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 Rockford, 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 RFDFIG. A THE SKY OVER ROCKFORDSECTION, 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 MORE0510TITLERockford, the skySTATION REPORT · ASOS RFDTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-17IDSR-RFD-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

35.0 F with a dew point of 31.0 F, 85 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 900 ft up.

Chart of the air at Rockford: temperature 35.0 degrees Fahrenheit and dew point 31.0, 85 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 900 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RFDFIG. B THE AIR AT ROCKFORDTHE 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 900 FT ABOVE THE STATION, AT 30.1 FTEMPERATURE 35.0 FDEW POINT 31.0 FSPREAD 4.0 FRELATIVE HUMIDITY 85 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 POINTTITLERockford, the airSTATION REPORT · ASOS RFDTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-17IDSR-RFD-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north (360 degrees) at 3 mph: force 1, a light air on the Beaufort scale.

Plan of the wind at Rockford, north up: blowing from 360 degrees, the north, at 3 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 1, light air, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RFDFIG. C THE WIND AT ROCKFORDPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 360°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 3 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLERockford, the windSTATION REPORT · ASOS RFDTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-17IDSR-RFD-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Rockford, 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 Caledonia

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

Near Caledonia

River and lake gauges