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Garrison, Montana

Community in Powell County, Montana

Air quality

The air at Garrison

Index 31, good, led by fine particles. Read at 10 PM from its reporting area, Helena (MT), 38 miles off.

31Good
  • Fine particles (PM2.5)31Good-

The days ahead

Yesterday measured 34, good.

Smoke, the next 44 hours

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

FriSat

Precipitation

What has fallen at Garrison

None in the last 3 days, to Thu 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 Garrison, the next 44 hours

Visibility stays 10 miles or more through Sat 6 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Garrison, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.4 miles away.

measured now4 instruments

Anaconda3U3

At an airfield/25.5 mi away/5,003 ft/658 ft above here

temp, wind, gust, visibility, precip, pressure

Rank792of 1,053

measured daily2 instruments

Deer Lodge 3 WDERM8

At a cooperative observer's station/9.0 mi away/4,810 ft/465 ft above here

snowfall, snow depth, precip, high, low

Rank-

Drummond 7.1 SWMT-GT-1

In a volunteer observer's own ground/20.6 mi away/4,327 ft/18 ft below here

precip, snowfall, snow depth

Rank-

Station report

The weather at Anaconda, drawn

The nearest airport reporting now, 25.5 mi from Garrison, Montana. From its report of Oct 15, 2026, 10:55 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 Anaconda, 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 3U3FIG. A THE SKY OVER ANACONDASECTION, 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 MORE0510TITLEAnaconda, the skySTATION REPORT · ASOS 3U3TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-3U3-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

34.5 F with a dew point of 31.0 F, 87 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 800 ft up.

Chart of the air at Anaconda: temperature 34.5 degrees Fahrenheit and dew point 31.0, 87 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; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 3U3FIG. B THE AIR AT ANACONDATHE 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 F50 FSATURATES 800 FT ABOVE THE STATION, AT 30.2 FTEMPERATURE 34.5 FDEW POINT 31.0 FSPREAD 3.5 FRELATIVE HUMIDITY 87 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 POINTTITLEAnaconda, the airSTATION REPORT · ASOS 3U3TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-3U3-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the southwest (230 degrees) at 9 mph: force 3, a gentle breeze on the Beaufort scale.

Plan of the wind at Anaconda, north up: blowing from 230 degrees, the southwest, at 9 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 3U3FIG. C THE WIND AT ANACONDAPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 230°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 9 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEAnaconda, the windSTATION REPORT · ASOS 3U3TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-3U3-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Anaconda, 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 Garrison

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

Near Garrison

River and lake gauges