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Rochester, Illinois

Village in Sangamon County, Illinois

Air quality

The air at Rochester

Index 21, good, led by fine particles. Read at 11 AM from its reporting area, Springfield (IL), 10 miles off.

21Good
  • Fine particles (PM2.5)21Good7.6 mi
  • Ozone17Good18 ppb7.4 mi

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 29, good.

Smoke, the next 45 hours

No smoke near the ground through Sun 7 AM.

FriSatSun

Precipitation

What has fallen at Rochester

0.46 in in the last 24 hours, 0.47 in over the last 3 days, to Fri 10 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.46in
Last 3 days
0.47in

Visibility

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

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

FriSatSun

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

What is measuring near here

The 5 instruments nearest Rochester, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 3.0 miles away.

measured now3 instruments

measured daily2 instruments

Station report

The weather at Springfield, drawn

The nearest airport reporting now, 9.6 mi from Rochester, Illinois. From its report of Oct 16, 2026, 10:52 AM local time: 3 of its 6 sheets.

The sky

Broken at 3,700 ft, broken at 4,500 ft; the ceiling is 3,700 ft; visibility 10 mi or more.

Section of the sky over Springfield, height above the station to scale: broken cloud with its base at 3,700 feet, broken cloud with its base at 4,500 feet, the ceiling at 3,700 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SPIFIG. A THE SKY OVER SPRINGFIELDSECTION, 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 STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETBKN 4,500 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYBKN 3,700 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 3,700 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLESpringfield, the skySTATION REPORT · ASOS SPITYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-SPI-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

53.0 F with a dew point of 41.0 F, 64 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,700 ft up; the lowest cloud reported is at 3,700 ft.

Chart of the air at Springfield: temperature 53.0 degrees Fahrenheit and dew point 41.0, 64 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,700 feet above the station, against the lowest cloud reported at 3,700 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SPIFIG. B THE AIR AT SPRINGFIELDTHE 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 2,700 FT ABOVE THE STATION, AT 38.3 FLOWEST CLOUD REPORTED, BKN 3,700 FTTEMPERATURE 53.0 FDEW POINT 41.0 FSPREAD 12.0 FRELATIVE HUMIDITY 64 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 POINTTITLESpringfield, the airSTATION REPORT · ASOS SPITYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-SPI-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west northwest (300 degrees) at 17 mph, gusting 25 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 35 mph.

Plan of the wind at Springfield, north up: blowing from 300 degrees, the west northwest, at 17 miles an hour, gusting 25; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SPIFIG. C THE WIND AT SPRINGFIELDPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 300°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 17 MPH5FRESH BREEZE196STRONG BREEZE25GUST, 25 MPH7NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLESpringfield, the windSTATION REPORT · ASOS SPITYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-SPI-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Springfield, 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 Rochester

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

Near Rochester

River and lake gauges