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Mount Vernon, Iowa

City in Linn County, Iowa

Air quality

The air at Mount Vernon

Index 21, good, led by fine particles. Read at 3 AM from its reporting area, Iowa City (IA), 19 miles off.

21Good
  • Fine particles (PM2.5)21Good14.3 mi
  • Ozone-15 ppb14.3 mi

The days ahead

Good each day through Today, led by ozone. Yesterday measured 26, good.

Smoke, the next 40 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Mount Vernon

0.26 in in the last 24 hours, 0.28 in over the last 3 days, to Fri 2 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.26in
Last 3 days
0.28in

Visibility

How far you can see at Mount Vernon, the next 40 hours

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

FriSat

On the radar over Mount Vernon, IowaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Mount Vernon, 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

Mount Vernon 0.4 NEIA-LN-45

In a volunteer observer's own ground/0.3 mi away/842 ft/68 ft below here

precip, snowfall, snow depth

Rank-

Station report

The weather at Mount Vernon - US30/IA1, drawn

The nearest instrument reporting now, 0.9 mi from Mount Vernon, Iowa. From its report of Oct 16, 2026, 3:30 AM local time: 3 of its 5 sheets.

The air

45.7 F with a dew point of 40.5 F, 82 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,200 ft up.

Chart of the air at Mount Vernon - US30/IA1: temperature 45.7 degrees Fahrenheit and dew point 40.5, 82 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,200 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RVNI4FIG. B THE AIR AT MOUNT VERNON - US30/IA1THE 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 F60 FSATURATES 1,200 FT ABOVE THE STATION, AT 39.4 FTEMPERATURE 45.7 FDEW POINT 40.5 FSPREAD 5.2 FRELATIVE HUMIDITY 82 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 - US30/IA1, the airSTATION REPORT · RWIS RVNI4TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 5DATE2026-10-16IDSR-RVNI4-1DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north northeast (30 degrees) at 13 mph, gusting 19 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 26 mph.

Plan of the wind at Mount Vernon - US30/IA1, north up: blowing from 30 degrees, the north northeast, at 13 miles an hour, gusting 19; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RVNI4FIG. C THE WIND AT MOUNT VERNON - US30/IA1PLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 30°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 13 MPH5FRESH BREEZE19GUST, 19 MPH6STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEMount Vernon - US30/IA1, the windSTATION REPORT · RWIS RVNI4TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 2 of 5DATE2026-10-16IDSR-RVNI4-2DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008

The column

At 820 ft above sea level, 3 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.05 inHg and the temperature at 56.1 F; it reports 45.7 F, 10.4 F colder than standard.

Section from sea level of where Mount Vernon - US30/IA1 stands in the atmosphere, height to scale: the station 820 feet above sea level with 3 per cent of the air below it; the standard atmosphere's pressure there, 29.05 inches of mercury, and temperature, 56.1 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RVNI4FIG. D WHERE MOUNT VERNON - US30/IA1 STANDS IN THE ATMOSPHERESECTION FROM SEA LEVEL, HEIGHT TO SCALE, THE STATION IN THE STANDARD ATMOSPHEREFT ABOVE SEA LEVEL05,00010,00015,000SEA LEVEL, 29.92 inHg IN THE STANDARD ATMOSPHEREMOUNT VERNON - US30/IA13 PER CENT OF THE AIR BELOW IT820 FT10 PER CENT OF THE AIR BELOW, 2,890 FT20 PER CENT OF THE AIR BELOW, 6,050 FT30 PER CENT OF THE AIR BELOW, 9,540 FT40 PER CENT OF THE AIR BELOW, 13,470 FTSTANDARD PRESSURE HERE29.05 inHgSTANDARD TEMPERATURE HERE56.1 FTEMPERATURE, REPORTED45.7 FTITLEMount Vernon - US30/IA1, the columnSTATION REPORT · RWIS RVNI4TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 3 of 5DATE2026-10-16IDSR-RVNI4-3DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The full report of Mount Vernon - US30/IA1, in 5 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at Cedar Rapids No 1 (CRPI4), 11.3 miles from here, read 15 Oct, 17:00. measured daily

Elsewhere in Iowa

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

Near Mount Vernon

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

Near Mount Vernon

River and lake gauges