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Nason, Illinois

City in Jefferson County, Illinois

Air quality

The air at Nason

Index 19, good, led by ozone. Read at 12 AM from its reporting area, Farrar (MO), 52 miles off.

19Good
  • Fine particles (PM2.5)-19.8 mi
  • Ozone19Good24 ppb19.8 mi

The days ahead

Yesterday measured 28, good.

Smoke, the next 43 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Nason

0.15 in in the last 24 hours, 1.35 in over the last 3 days, to Fri 12 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.15in
Last 3 days
1.35in

Visibility

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

Visibility stays 4 miles or more through Sat 7 PM, lowest 5 miles Fri 5 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Nason, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.1 miles away.

measured now4 instruments

measured daily2 instruments

Ina 0.2 SSWIL-JF-18

In a volunteer observer's own ground/3.8 mi away/432 ft/8 ft below here

precip, snowfall, snow depth

Rank333of 1,393

WaltonvilleWLTI2

At a cooperative observer's station/5.2 mi away/443 ft/3 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Mount Vernon, drawn

The nearest airport reporting now, 11.7 mi from Nason, Illinois. From its report of Oct 16, 2026, 12:39 AM local time: 3 of its 6 sheets.

The sky

A few clouds at 1,500 ft, broken at 1,900 ft, overcast at 3,400 ft; the ceiling is 1,900 ft; visibility 10 mi or more.

Section of the sky over Mount Vernon, height above the station to scale: a few clouds cloud with its base at 1,500 feet, broken cloud with its base at 1,900 feet, overcast cloud with its base at 3,400 feet, the ceiling at 1,900 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MVNFIG. A THE SKY OVER MOUNT VERNONSECTION, 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 STATION01,0002,0003,0004,0005,0006,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 3,400 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 1,900 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYFEW 1,500 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYCEILING 1,900 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEMount Vernon, the skySTATION REPORT · ASOS MVNTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-MVN-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

73.4 F with a dew point of 66.2 F, 78 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,700 ft up; the lowest cloud reported is at 1,500 ft.

Chart of the air at Mount Vernon: temperature 73.4 degrees Fahrenheit and dew point 66.2, 78 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,700 feet above the station, against the lowest cloud reported at 1,500 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MVNFIG. B THE AIR AT MOUNT VERNONTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00050 F60 F70 F80 FSATURATES 1,700 FT ABOVE THE STATION, AT 64.4 FLOWEST CLOUD REPORTED, FEW 1,500 FTTEMPERATURE 73.4 FDEW POINT 66.2 FSPREAD 7.2 FRELATIVE HUMIDITY 78 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 POINTTITLEMount Vernon, the airSTATION REPORT · ASOS MVNTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-MVN-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west northwest (300 degrees) at 10 mph, gusting 22 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 22 mph.

Plan of the wind at Mount Vernon, north up: blowing from 300 degrees, the west northwest, at 10 miles an hour, gusting 22; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MVNFIG. C THE WIND AT MOUNT VERNONPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 300°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 10 MPH4MODERATE BREEZE135FRESH BREEZE19GUST, 22 MPH6STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEMount Vernon, the windSTATION REPORT · ASOS MVNTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-MVN-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Waltonville (WLTI2), 5.2 miles from here, read 15 Oct, 14:00. measured daily

Elsewhere in Illinois

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

Near Nason

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

Near Nason

River and lake gauges