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Altamont, South Dakota

Town in Deuel County, South Dakota

Air quality

The air at Altamont

Index 24, good, led by ozone. Read at 1 PM from its reporting area, Watertown (SD), 22 miles off.

24Good
  • Fine particles (PM2.5)19Good21.9 mi
  • Ozone24Good26 ppb21.9 mi
  • Coarse particles (PM10)7Good21.9 mi

The days ahead

Yesterday measured 28, good.

Smoke, the next 43 hours

No smoke near the ground through Sun 7 AM.

FriSatSun

Precipitation

What has fallen at Altamont

0.02 in in the last 24 hours, 0.11 in over the last 3 days, to Fri 12 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.02in
Last 3 days
0.11in

Visibility

How far you can see at Altamont, the next 43 hours

Visibility stays 10 miles or more through Sun 7 AM.

FriSatSun

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

What is measuring near here

The 6 instruments nearest Altamont, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 3.6 miles away.

measured now4 instruments

Precip At Waverly445959096582600

At a river or reservoir gauge/17.7 mi away/1,988 ft/142 ft above here

temp, wind, gust, humidity, pressure

Rank427of 806

WatertownATY

At an airfield/23.3 mi away/1,725 ft/121 ft below here

temp, wind, gust, visibility, precip, pressure

Rank123of 806

measured daily2 instruments

Clear Lake 0.9 SSD-DL-8

In a volunteer observer's own ground/6.0 mi away/1,813 ft/33 ft below here

precip, snowfall, snow depth

Rank-

Station report

The weather at Watertown, drawn

The nearest airport reporting now, 23.3 mi from Altamont, South Dakota. From its report of Oct 16, 2026, 12:53 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 6DATE2026-10-16IDSR-ATY-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

46.0 F with a dew point of 30.0 F, 53 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 3,600 ft up.

Chart of the air at Watertown: temperature 46.0 degrees Fahrenheit and dew point 30.0, 53 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 3,600 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 STATION01,0002,0003,0004,0005,00020 F30 F40 F50 F60 FSATURATES 3,600 FT ABOVE THE STATION, AT 26.6 FTEMPERATURE 46.0 FDEW POINT 30.0 FSPREAD 16.0 FRELATIVE HUMIDITY 53 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 6DATE2026-10-16IDSR-ATY-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north northwest (340 degrees) at 17 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 49 mph.

Plan of the wind at Watertown, north up: blowing from 340 degrees, the north northwest, at 17 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 4, moderate 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 340°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 17 MPH5FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEWatertown, the windSTATION REPORT · ASOS ATYTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-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

0in

Snow on the ground

Measured at Watertown-23MI.Ese (CLKS2), 6.2 miles from here, read 16 Oct, 06:30. measured daily

Elsewhere in South Dakota

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

Near Altamont

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

Near Altamont

River and lake gauges