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Clark, South Dakota

City in Clark County, South Dakota

Air quality

The air at Clark

Index 35, good, led by coarse particles. Read at 12 AM from its reporting area, Watertown (SD), 30 miles off.

35Good
  • Fine particles (PM2.5)29Good-
  • Ozone14Good-
  • Coarse particles (PM10)35Good-

The days ahead

Yesterday measured 28, good.

Smoke, the next 44 hours

No smoke near the ground through Sun 7 PM.

SatSun

Precipitation

What has fallen at Clark

None in the last 24 hours; 0.19 in over the last 3 days, to Fri 11 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.19in

Visibility

How far you can see at Clark, the next 44 hours

Visibility stays 10 miles or more through Sun 7 PM.

SatSun

On the radar over Clark, South DakotaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 5 instruments nearest Clark, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.2 miles away.

measured now3 instruments

WatertownATY

At an airfield/28.5 mi away/1,725 ft/90 ft below here

temp, wind, gust, visibility, precip, pressure

Rank114of 817

measured daily2 instruments

Clark 0.3 SWSD-CK-3

In a volunteer observer's own ground/0.2 mi away/1,820 ft/5 ft above here

precip, snowfall, snow depth

Rank-

Clark No2CAKS2

At a cooperative observer's station/0.2 mi away/1,801 ft/14 ft below here

snowfall, snow depth, precip, high, low

Rank140of 817

Station report

The weather at Watertown, drawn

The nearest airport reporting now, 28.5 mi from Clark, South Dakota. From its report of Oct 16, 2026, 11:53 PM local time: 3 of its 6 sheets.

The sky

No cloud below 12,000 ft; visibility 10 mi or more.

Section of the sky over Watertown, height above the station to scale: no cloud detected below 12,000 feet, the reach of its ceilometer, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ATYFIG. A THE SKY OVER WATERTOWNSECTION, 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 STATION05001,0001,5002,0002,5003,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETNO CLOUD DETECTED BELOW 12,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEWatertown, the skySTATION REPORT · ASOS ATYTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-17IDSR-ATY-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

34.0 F with a dew point of 28.0 F, 78 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,400 ft up.

Chart of the air at Watertown: temperature 34.0 degrees Fahrenheit and dew point 28.0, 78 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,400 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ATYFIG. B THE AIR AT WATERTOWNTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00020 F30 F40 FSATURATES 1,400 FT ABOVE THE STATION, AT 26.7 FTEMPERATURE 34.0 FDEW POINT 28.0 FSPREAD 6.0 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 POINTTITLEWatertown, the airSTATION REPORT · ASOS ATYTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-17IDSR-ATY-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south southwest (200 degrees) at 8 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 49 mph.

Plan of the wind at Watertown, north up: blowing from 200 degrees, the south southwest, at 8 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ATYFIG. C THE WIND AT WATERTOWNPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 200°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 8 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEWatertown, the windSTATION REPORT · ASOS ATYTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-17IDSR-ATY-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

-

Snow on the ground

Elsewhere in South Dakota

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

Near Clark

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

Near Clark

River and lake gauges