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Colchester, Illinois

City in McDonough County, Illinois

Air quality

The air at Colchester

Index 19, good, led by ozone. Read at 7 PM from its reporting area, Rock Island-Moline (IL), 65 miles off.

19Good
  • Fine particles (PM2.5)6Good-
  • Ozone19Good-

The days ahead

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

Smoke, the next 42 hours

No smoke near the ground through Sun 1 PM.

FriSatSun

Precipitation

What has fallen at Colchester

None in the last 24 hours; 0.17 in over the last 3 days, to Fri 7 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.17in

Visibility

How far you can see at Colchester, the next 42 hours

Visibility stays 8 miles or more through Sun 1 PM, lowest 8 miles Sat 7 AM.

FriSatSun

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

What is measuring near here

The 6 instruments nearest Colchester, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.3 miles away.

measured now4 instruments

measured daily2 instruments

Colchester 0.4 SIL-MCD-16

In a volunteer observer's own ground/0.3 mi away/688 ft/7 ft below here

precip, snowfall, snow depth

Rank-

MacombMQBI2

At a cooperative observer's station/7.2 mi away/696 ft/1 ft above here

snowfall, snow depth, precip, high, low

Rank1,021of 1,419

Station report

The weather at Macomb Muni, drawn

The nearest airport reporting now, 9.9 mi from Colchester, Illinois. From its report of Oct 16, 2026, 7:55 PM local time: 3 of its 6 sheets.

The sky

Scattered at 4,600 ft, scattered at 5,500 ft; visibility 10 mi or more.

Section of the sky over Macomb Muni, height above the station to scale: scattered cloud with its base at 4,600 feet, scattered cloud with its base at 5,500 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MQBFIG. A THE SKY OVER MACOMB MUNISECTION, 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 STATION02,5005,0007,50010,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETSCT 5,500 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYSCT 4,600 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYVISIBILITY, MILES: 10 MI OR MORE0510TITLEMacomb Muni, the skySTATION REPORT · ASOS MQBTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-17IDSR-MQB-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

48.2 F with a dew point of 42.6 F, 81 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,300 ft up; the lowest cloud reported is at 4,600 ft.

Chart of the air at Macomb Muni: temperature 48.2 degrees Fahrenheit and dew point 42.6, 81 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,300 feet above the station, against the lowest cloud reported at 4,600 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MQBFIG. B THE AIR AT MACOMB MUNITHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,00030 F40 F50 F60 FSATURATES 1,300 FT ABOVE THE STATION, AT 41.3 FLOWEST CLOUD REPORTED, SCT 4,600 FTTEMPERATURE 48.2 FDEW POINT 42.6 FSPREAD 5.6 FRELATIVE HUMIDITY 81 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 POINTTITLEMacomb Muni, the airSTATION REPORT · ASOS MQBTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-17IDSR-MQB-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north northwest (330 degrees) at 15 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 31 mph.

Plan of the wind at Macomb Muni, north up: blowing from 330 degrees, the north northwest, at 15 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MQBFIG. C THE WIND AT MACOMB MUNIPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 330°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 15 MPH5FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEMacomb Muni, the windSTATION REPORT · ASOS MQBTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-17IDSR-MQB-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Macomb (MQBI2), 7.2 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 Colchester

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

Near Colchester

River and lake gauges