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Swan, Iowa

City in Marion County, Iowa

Air quality

The air at Swan

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

19Good
  • Fine particles (PM2.5)19Good-
  • Ozone19Good19 ppb19.5 mi

The days ahead

Good each day through Sat Oct 17, led by fine particles. Yesterday measured 17, good.

Smoke, the next 41 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Swan

0.34 in in the last 24 hours, and none in the 2 days before, to Fri 2 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.34in
Last 3 days
0.34in

Visibility

How far you can see at Swan, the next 41 hours

Visibility stays 7 miles or more through Sat 7 PM, lowest 8 miles Sat 3 AM.

FriSat

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

What is measuring near here

The 7 instruments nearest Swan, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.0 miles away.

measured now5 instruments

KnoxvilleOXV

At an airfield/15.6 mi away/925 ft/123 ft above here

temp, wind, gust, visibility, precip, pressure

Rank170of 1,060

measured daily2 instruments

Swan 0.8 SSEIA-MA-3

In a volunteer observer's own ground/1.0 mi away/817 ft/15 ft above here

precip, snowfall, snow depth

Rank-

HartfordHRFI4

At a cooperative observer's station/3.8 mi away/840 ft/38 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Knoxville, drawn

The nearest airport reporting now, 15.6 mi from Swan, Iowa. From its report of Oct 16, 2026, 3:35 AM local time: 3 of its 6 sheets.

The sky

Overcast at 4,200 ft; the ceiling is 4,200 ft; visibility 10 mi or more.

Section of the sky over Knoxville, height above the station to scale: overcast cloud with its base at 4,200 feet, the ceiling at 4,200 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT OXVFIG. A THE SKY OVER KNOXVILLESECTION, 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 SHEETOVC 4,200 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 4,200 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEKnoxville, the skySTATION REPORT · ASOS OXVTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-OXV-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 39.2 F, 71 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,100 ft up; the lowest cloud reported is at 4,200 ft.

Chart of the air at Knoxville: temperature 48.2 degrees Fahrenheit and dew point 39.2, 71 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,100 feet above the station, against the lowest cloud reported at 4,200 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT OXVFIG. B THE AIR AT KNOXVILLETHE 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 2,100 FT ABOVE THE STATION, AT 37.2 FLOWEST CLOUD REPORTED, OVC 4,200 FTTEMPERATURE 48.2 FDEW POINT 39.2 FSPREAD 9.0 FRELATIVE HUMIDITY 71 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 POINTTITLEKnoxville, the airSTATION REPORT · ASOS OXVTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-OXV-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west northwest (290 degrees) at 14 mph, gusting 22 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 26 mph.

Plan of the wind at Knoxville, north up: blowing from 290 degrees, the west northwest, at 14 miles an hour, gusting 22; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT OXVFIG. C THE WIND AT KNOXVILLEPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 290°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 14 MPH5FRESH BREEZE19GUST, 22 MPH6STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEKnoxville, the windSTATION REPORT · ASOS OXVTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-OXV-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Hartford (HRFI4), 3.8 miles from here, read 13 Oct, 07:50. measured daily

Elsewhere in Iowa

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

Near Swan

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

Near Swan

River and lake gauges