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Mendon, Illinois

Village in Adams County, Illinois

Air quality

The air at Mendon

Index 21, good, led by ozone. Read at 12 AM from its reporting area, Mark Twain State Park (MO), 50 miles off.

21Good
  • Ozone21Good18 ppb12.2 mi
  • Coarse particles (PM10)8Good-

The days ahead

Yesterday measured 19, good.

Smoke, the next 43 hours

No smoke near the ground through Sun 7 PM.

SatSun

Precipitation

What has fallen at Mendon

None in the last 24 hours; 0.06 in over the last 3 days, to Sat 12 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.06in

Visibility

How far you can see at Mendon, the next 43 hours

Visibility stays 9 miles or more through Sun 7 PM, lowest 10 miles Sat 8 AM.

SatSun

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

What is measuring near here

The 6 instruments nearest Mendon, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 8.4 miles away.

measured now4 instruments

QuincyUIN

At an airfield/11.1 mi away/768 ft/7 ft above here

temp, wind, gust, visibility, precip, pressure

Rank2of 1,419

measured daily2 instruments

Camp Point 4.6 NWIL-AD-26

In a volunteer observer's own ground/8.4 mi away/673 ft/88 ft below here

precip, snowfall, snow depth

Rank-

BentleyBTYI2

At a cooperative observer's station/19.2 mi away/679 ft/82 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Quincy, drawn

The nearest airport reporting now, 11.1 mi from Mendon, Illinois. From its report of Oct 17, 2026, 12:54 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 Quincy, 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 UINFIG. A THE SKY OVER QUINCYSECTION, 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 MORE0510TITLEQuincy, the skySTATION REPORT · ASOS UINTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-17IDSR-UIN-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

41.0 F with a dew point of 38.0 F, 89 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 700 ft up.

Chart of the air at Quincy: temperature 41.0 degrees Fahrenheit and dew point 38.0, 89 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 700 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT UINFIG. B THE AIR AT QUINCYTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00030 F40 F50 FSATURATES 700 FT ABOVE THE STATION, AT 37.3 FTEMPERATURE 41.0 FDEW POINT 38.0 FSPREAD 3.0 FRELATIVE HUMIDITY 89 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 POINTTITLEQuincy, the airSTATION REPORT · ASOS UINTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-17IDSR-UIN-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north northwest (330 degrees) at 7 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at Quincy, north up: blowing from 330 degrees, the north northwest, at 7 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 UINFIG. C THE WIND AT QUINCYPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 330°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 7 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEQuincy, the windSTATION REPORT · ASOS UINTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-17IDSR-UIN-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Mississippi River AT Quincy LD21 (QLDI2), 20.9 miles from here, read 16 Oct, 06:00. measured daily

Elsewhere in Illinois

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

Near Mendon

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

Near Mendon

River and lake gauges