Storm Station
Sign in

Castlewood, South Dakota

City in Hamlin County, South Dakota

Air quality

The air at Castlewood

Index 18, good, led by ozone. Read at 2 AM from its reporting area, Watertown (SD), 13 miles off.

18Good
  • Fine particles (PM2.5)12Good-
  • Ozone18Good-
  • Coarse particles (PM10)8Good-

The days ahead

Yesterday measured 28, good.

Smoke, the next 41 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Castlewood

0.09 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
0.09in
Last 3 days
0.09in

Visibility

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

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

FriSat

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

What is measuring near here

The 6 instruments nearest Castlewood, 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 now4 instruments

WatertownATY

At an airfield/14.6 mi away/1,725 ft/35 ft above here

temp, wind, gust, visibility, precip, pressure

Rank123of 806

measured daily2 instruments

Castlewood 0.3 ESD-HM-13

In a volunteer observer's own ground/0.2 mi away/1,710 ft/20 ft above here

precip, snowfall, snow depth

Rank-

CastlewoodCLWS2

At a cooperative observer's station/0.5 mi away/1,704 ft/14 ft above here

snowfall, snow depth, precip, high, low

Rank18of 806

Station report

The weather at Watertown, drawn

The nearest airport reporting now, 14.6 mi from Castlewood, South Dakota. From its report of Oct 16, 2026, 2:53 AM local time: 3 of its 6 sheets.

The sky

A few clouds at 1,700 ft, broken at 3,100 ft, overcast at 3,800 ft; the ceiling is 3,100 ft; visibility 10 mi or more.

Section of the sky over Watertown, height above the station to scale: a few clouds cloud with its base at 1,700 feet, broken cloud with its base at 3,100 feet, overcast cloud with its base at 3,800 feet, the ceiling at 3,100 feet, 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 STATION01,0002,0003,0004,0005,0006,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 3,800 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 3,100 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYFEW 1,700 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYCEILING 3,100 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, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

41.0 F with a dew point of 37.0 F, 86 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 900 ft up; the lowest cloud reported is at 1,700 ft.

Chart of the air at Watertown: temperature 41.0 degrees Fahrenheit and dew point 37.0, 86 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 900 feet above the station, against the lowest cloud reported at 1,700 feet; 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 STATION01,0002,0003,00030 F40 F50 FSATURATES 900 FT ABOVE THE STATION, AT 36.1 FLOWEST CLOUD REPORTED, FEW 1,700 FTTEMPERATURE 41.0 FDEW POINT 37.0 FSPREAD 4.0 FRELATIVE HUMIDITY 86 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-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north (350 degrees) at 22 mph, gusting 33 mph: force 5, a fresh breeze on the Beaufort scale. The strongest gust today was 47 mph.

Plan of the wind at Watertown, north up: blowing from 350 degrees, the north, at 22 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 ATYFIG. C THE WIND AT WATERTOWNPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 350°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE19NOW, 22 MPH6STRONG BREEZE257NEAR GALE32GUST, 33 MPH8GALE399STRONG 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

-

Snow on the ground

Elsewhere in South Dakota

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

Near Castlewood

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

Near Castlewood

River and lake gauges