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Rock Valley, Iowa

City in Sioux County, Iowa

Air quality

The air at Rock Valley

Index 23, good, led by ozone. Read at 12 PM from its reporting area, Sioux Falls (SD), 32 miles off.

23Good
  • Fine particles (PM2.5)18Good-
  • Ozone23Good-
  • Coarse particles (PM10)16Good-

The days ahead

Yesterday measured 32, good.

Smoke, the next 44 hours

No smoke near the ground through Sun 7 AM.

FriSatSun

Precipitation

What has fallen at Rock Valley

0.27 in in the last 24 hours, 0.79 in over the last 3 days, to Fri 11 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.27in
Last 3 days
0.79in

Visibility

How far you can see at Rock Valley, the next 44 hours

Visibility stays 10 miles or more through Sun 7 AM.

FriSatSun

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

What is measuring near here

The 6 instruments nearest Rock Valley, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.4 miles away.

measured now4 instruments

MilnervilleBKTI4

At a river or reservoir gauge/37.6 mi away/1,224 ft/28 ft below here

temp, wind, gust, humidity, pressure

Rank195of 1,060

measured daily2 instruments

Rock ValleyRKVI4

At a cooperative observer's station/0.4 mi away/1,257 ft/5 ft above here

snowfall, snow depth, precip, high, low

Rank-

Rock Valley 0.4 WSWIA-SX-19

In a volunteer observer's own ground/0.6 mi away/1,249 ft/3 ft below here

precip, snowfall, snow depth

Rank-

Station report

The weather at Sioux County, drawn

The nearest airport reporting now, 16.1 mi from Rock Valley, Iowa. From its report of Oct 16, 2026, 12:15 PM local time: 3 of its 6 sheets.

The sky

Broken at 3,000 ft, broken at 3,500 ft; the ceiling is 3,000 ft; visibility 10 mi or more.

Section of the sky over Sioux County, height above the station to scale: broken cloud with its base at 3,000 feet, broken cloud with its base at 3,500 feet, the ceiling at 3,000 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 STATION01,0002,0003,0004,0005,0006,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETBKN 3,500 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYBKN 3,000 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 3,000 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 33.8 F, 61 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,900 ft up; the lowest cloud reported is at 3,000 ft.

Chart of the air at Sioux County: temperature 46.4 degrees Fahrenheit and dew point 33.8, 61 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,900 feet above the station, against the lowest cloud reported at 3,000 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 STATION01,0002,0003,0004,00020 F30 F40 F50 F60 FSATURATES 2,900 FT ABOVE THE STATION, AT 31.1 FLOWEST CLOUD REPORTED, BKN 3,000 FTTEMPERATURE 46.4 FDEW POINT 33.8 FSPREAD 12.6 FRELATIVE HUMIDITY 61 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 north northwest (330 degrees) at 23 mph, gusting 33 mph: force 5, a fresh breeze on the Beaufort scale. The strongest gust today was 43 mph.

Plan of the wind at Sioux County, north up: blowing from 330 degrees, the north northwest, at 23 miles an hour, gusting 33; 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 330°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE19NOW, 23 MPH6STRONG BREEZE257NEAR GALE32GUST, 33 MPH8GALE399STRONG 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

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Snow on the ground

Elsewhere in Iowa

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

Near Rock Valley

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

Near Rock Valley

River and lake gauges