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Alton, Iowa

City in Sioux County, Iowa

Air quality

The air at Alton

Index 18, good, led by ozone. Read at 10 PM from its reporting area, Sioux City (IA), 37 miles off.

18Good
  • Ozone18Good-

The days ahead

Yesterday measured 14, good.

Smoke, the next 45 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Alton

0.66 in in the last 24 hours, and none in the 2 days before, to Thu 10 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.66in
Last 3 days
0.66in

Visibility

How far you can see at Alton, the next 45 hours

Visibility stays 9 miles or more through Sat 7 PM, lowest 9 miles Fri 4 AM.

FriSat

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

What is measuring near here

The 6 instruments nearest Alton, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.7 miles away.

measured now4 instruments

MilnervilleBKTI4

At a river or reservoir gauge/34.9 mi away/1,224 ft/121 ft below here

temp, wind, gust, humidity, pressure

Rank195of 1,060

measured daily2 instruments

Orange CityORCI4

At a cooperative observer's station/2.3 mi away/1,401 ft/56 ft above here

snowfall, snow depth, precip, high, low

Rank771of 1,060

Station report

The weather at Sioux County, drawn

The nearest airport reporting now, 7.6 mi from Alton, Iowa. From its report of Oct 15, 2026, 11:15 PM local time: 3 of its 6 sheets.

The sky

Overcast at 4,100 ft; the ceiling is 4,100 ft; visibility 10 mi or more.

Section of the sky over Sioux County, height above the station to scale: overcast cloud with its base at 4,100 feet, the ceiling at 4,100 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SXKFIG. A THE SKY OVER SIOUX COUNTYSECTION, 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 4,100 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 4,100 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLESioux County, the skySTATION REPORT · ASOS SXKTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-SXK-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

46.4 F with a dew point of 39.2 F, 76 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 4,100 ft.

Chart of the air at Sioux County: temperature 46.4 degrees Fahrenheit and dew point 39.2, 76 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 4,100 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SXKFIG. B THE AIR AT SIOUX COUNTYTHE 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 1,700 FT ABOVE THE STATION, AT 37.6 FLOWEST CLOUD REPORTED, OVC 4,100 FTTEMPERATURE 46.4 FDEW POINT 39.2 FSPREAD 7.2 FRELATIVE HUMIDITY 76 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 POINTTITLESioux County, the airSTATION REPORT · ASOS SXKTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-SXK-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west northwest (300 degrees) at 21 mph, gusting 29 mph: force 5, a fresh breeze on the Beaufort scale. The strongest gust today was 37 mph.

Plan of the wind at Sioux County, north up: blowing from 300 degrees, the west northwest, at 21 miles an hour, gusting 29; beside it the Beaufort scale from calm to hurricane force, force 5, fresh breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SXKFIG. C THE WIND AT SIOUX COUNTYPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 300°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE19NOW, 21 MPH6STRONG BREEZE25GUST, 29 MPH7NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLESioux County, the windSTATION REPORT · ASOS SXKTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-SXK-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Orange City (ORCI4), 2.3 miles from here, read 15 Oct, 07:00. measured daily

Elsewhere in Iowa

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

Near Alton

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

Near Alton

River and lake gauges