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Dewey, Montana

Community in Beaverhead County, Montana

Air quality

The air at Dewey

Index 12, good, led by fine particles. Read at 10 PM from its reporting area, Dillon (MT), 41 miles off.

12Good
  • Fine particles (PM2.5)12Good-

The days ahead

Yesterday measured 13, good.

Smoke, the next 45 hours

Little smoke near the ground through Sun 6 PM: the index from smoke stays at 22 or under.

SatSun

Precipitation

What has fallen at Dewey

None in the last 3 days, to Fri 9 PM. 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 Dewey, the next 45 hours

Visibility stays 10 miles or more through Sun 6 PM.

SatSun

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

What is measuring near here

The 5 instruments nearest Dewey, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 3.9 miles away.

measured now3 instruments

measured daily2 instruments

Dillon 19.5 NMT-BV-3

In a volunteer observer's own ground/20.7 mi away/5,014 ft/497 ft below here

precip, snowfall, snow depth

Rank-

Butte - Montana TechMTTM8

At a cooperative observer's station/21.7 mi away/5,767 ft/256 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Butte/Bert Mooney, drawn

The nearest airport reporting now, 21.1 mi from Dewey, Montana. From its report of Oct 16, 2026, 9:53 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 Butte/Bert Mooney, 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 BTMFIG. A THE SKY OVER BUTTE/BERT MOONEYSECTION, 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 MORE0510TITLEButte/Bert Mooney, the skySTATION REPORT · ASOS BTMTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-17IDSR-BTM-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

41.0 F with a dew point of 30.0 F, 65 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,500 ft up.

Chart of the air at Butte/Bert Mooney: temperature 41.0 degrees Fahrenheit and dew point 30.0, 65 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,500 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BTMFIG. B THE AIR AT BUTTE/BERT MOONEYTHE 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 FSATURATES 2,500 FT ABOVE THE STATION, AT 27.6 FTEMPERATURE 41.0 FDEW POINT 30.0 FSPREAD 11.0 FRELATIVE HUMIDITY 65 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 POINTTITLEButte/Bert Mooney, the airSTATION REPORT · ASOS BTMTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-17IDSR-BTM-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Butte/Bert Mooney, north up: calm; beside it the Beaufort scale from calm to hurricane force, force 0, calm, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BTMFIG. C THE WIND AT BUTTE/BERT MOONEYPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONCALMBEAUFORT FORCELEAST WIND, MPH0CALM0NOW, 0 MPH1LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEButte/Bert Mooney, the windSTATION REPORT · ASOS BTMTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-17IDSR-BTM-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Butte/Bert Mooney, in 6 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in Montana

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

Near Dewey

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

Near Dewey

River and lake gauges