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Fort Smith, Montana

Community in Big Horn County, Montana

Air quality

The air at Fort Smith

Index 22, good, led by fine particles. Read at 1 AM from its reporting area, Billings (MT), 43 miles off.

22Good
  • Fine particles (PM2.5)22Good-
  • Ozone19Good-

The days ahead

Yesterday measured 32, good.

Smoke, the next 41 hours

No smoke near the ground through Sat 6 PM.

FriSat

Precipitation

What has fallen at Fort Smith

None in the last 3 days, to Fri 12 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.00in

Visibility

How far you can see at Fort Smith, the next 41 hours

Visibility stays 10 miles or more through Sat 6 PM.

FriSat

On the radar over Fort Smith, MontanaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 5 instruments nearest Fort Smith, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.1 miles away.

measured now3 instruments

measured daily2 instruments

Yellowtail DamBHRM8

At a dam/1.0 mi away/3,274 ft/5 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Big Horn County, drawn

The nearest airport reporting now, 32.5 mi from Fort Smith, Montana. From its report of Oct 16, 2026, 1:50 AM local time: 3 of its 6 sheets.

The sky

Scattered at 4,500 ft; visibility 10 mi or more.

Section of the sky over Big Horn County, height above the station to scale: scattered cloud with its base at 4,500 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 00UFIG. A THE SKY OVER BIG HORN 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 SHEETSCT 4,500 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYVISIBILITY, MILES: 10 MI OR MORE0510TITLEBig Horn County, the skySTATION REPORT · ASOS 00UTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-00U-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

26.6 F with a dew point of 23.0 F, 86 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 800 ft up; the lowest cloud reported is at 4,500 ft.

Chart of the air at Big Horn County: temperature 26.6 degrees Fahrenheit and dew point 23.0, 86 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 800 feet above the station, against the lowest cloud reported at 4,500 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 00UFIG. B THE AIR AT BIG HORN 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 STATION01,0002,0003,0004,0005,00010 F20 F30 F40 FSATURATES 800 FT ABOVE THE STATION, AT 22.2 FLOWEST CLOUD REPORTED, SCT 4,500 FTTEMPERATURE 26.6 FDEW POINT 23.0 FSPREAD 3.6 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 POINTTITLEBig Horn County, the airSTATION REPORT · ASOS 00UTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-00U-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northeast (40 degrees) at 5 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at Big Horn County, north up: blowing from 40 degrees, the northeast, at 5 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 2, light breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 00UFIG. C THE WIND AT BIG HORN COUNTYPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 40°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 5 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEBig Horn County, the windSTATION REPORT · ASOS 00UTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-00U-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Yellowtail Dam (BHRM8), 1.0 miles from here, read 7 Oct, 07:15. measured daily

Elsewhere in Montana

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

Near Fort Smith

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

Near Fort Smith

River and lake gauges