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St. Ignatius, Montana

Town in Lake County, Montana

Air quality

The air at St. Ignatius

Index 63, moderate, led by fine particles. Read at 9 PM from its reporting area, Seeley Lake (MT), 30 miles off.

63Moderate
  • Fine particles (PM2.5)63Moderate22.1 mi

The days ahead

Yesterday measured 54, moderate.

Smoke, the next 45 hours

Little smoke near the ground through Sat 6 PM: the index from smoke stays at 17 or under.

FriSat

Precipitation

What has fallen at St. Ignatius

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 St. Ignatius, the next 45 hours

Visibility stays 10 miles or more through Sat 6 PM.

FriSat

On the radar over St. Ignatius, MontanaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest St. Ignatius, 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

measured daily2 instruments

Saint IgnatiusSTIM8

At a cooperative observer's station/0.4 mi away/2,927 ft/11 ft below here

snowfall, snow depth, precip, high, low

Rank-

Charlo 0.4 SMT-LK-4

In a volunteer observer's own ground/8.8 mi away/2,936 ft/2 ft below here

precip, snowfall, snow depth

Rank-

Station report

The weather at Ronanairport, drawn

The nearest airport reporting now, 17.1 mi from St. Ignatius, Montana. From its report of Oct 15, 2026, 9:55 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 Ronanairport, 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 7S0FIG. A THE SKY OVER RONANAIRPORTSECTION, 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 MORE0510TITLERonanairport, the skySTATION REPORT · ASOS 7S0TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-7S0-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

39.2 F with a dew point of 35.6 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 Ronanairport: temperature 39.2 degrees Fahrenheit and dew point 35.6, 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 7S0FIG. B THE AIR AT RONANAIRPORTTHE 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 34.8 FTEMPERATURE 39.2 FDEW POINT 35.6 FSPREAD 3.6 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 POINTTITLERonanairport, the airSTATION REPORT · ASOS 7S0TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-7S0-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Ronanairport, 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 7S0FIG. C THE WIND AT RONANAIRPORTPLAN, 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 FORCE73TITLERonanairport, the windSTATION REPORT · ASOS 7S0TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-7S0-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Ronanairport, 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 St. Ignatius

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

Near St. Ignatius

River and lake gauges