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St. Mary, Montana

Community in Glacier County, Montana

Air quality

The air at St. Mary

Index 15, good, led by ozone. Read at 9 PM from its reporting area, Glacier National Park (MT), 30 miles off.

15Good
  • Ozone15Good-

The days ahead

Yesterday measured 16, good.

Smoke, the next 45 hours

Little smoke near the ground through Sat 6 PM: the index from smoke stays at 33 or under.

FriSat

Precipitation

What has fallen at St. Mary

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. Mary, the next 45 hours

Visibility stays 10 miles or more through Sat 6 PM.

FriSat

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

What is measuring near here

The 5 instruments nearest St. Mary, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.0 miles away.

measured now3 instruments

St MarySRYM8

At a river or reservoir gauge/0.0 mi away/4,593 ft/11 ft below here

temp, wind, gust, humidity, pressure

Rank205of 1,053

measured daily2 instruments

St. MaryMRYM8

At a cooperative observer's station/0.3 mi away/4,551 ft/53 ft below here

snowfall, snow depth, precip, high, low

Rank-

Cut Bank 23.9 NWMT-GR-2

In a volunteer observer's own ground/31.4 mi away/4,302 ft/302 ft below here

precip, snowfall, snow depth

Rank-

Station report

The weather at St Mary, drawn

The nearest instrument reporting now, 0.0 mi from St. Mary, Montana. From its report of Oct 15, 2026, 9:11 PM local time: 3 of its 5 sheets.

The air

38.0 F with a dew point of 28.7 F, 69 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,100 ft up.

Chart of the air at St Mary: temperature 38.0 degrees Fahrenheit and dew point 28.7, 69 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,100 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SRYM8FIG. B THE AIR AT ST MARYTHE 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 2,100 FT ABOVE THE STATION, AT 26.7 FTEMPERATURE 38.0 FDEW POINT 28.7 FSPREAD 9.3 FRELATIVE HUMIDITY 69 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 POINTTITLESt Mary, the airSTATION REPORT · DCP SRYM8TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 5DATE2026-10-16IDSR-SRYM8-1DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south southeast (162 degrees) at 2 mph, gusting 9 mph: force 1, a light air on the Beaufort scale. The strongest gust today was 14 mph.

Plan of the wind at St Mary, north up: blowing from 162 degrees, the south southeast, at 2 miles an hour, gusting 9; beside it the Beaufort scale from calm to hurricane force, force 1, light air, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SRYM8FIG. C THE WIND AT ST MARYPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 162°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 2 MPH2LIGHT BREEZE43GENTLE BREEZE8GUST, 9 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLESt Mary, the windSTATION REPORT · DCP SRYM8TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 2 of 5DATE2026-10-16IDSR-SRYM8-2DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008

The column

At 4,593 ft above sea level, 16 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 25.28 inHg and the temperature at 42.6 F; it reports 38.0 F, 4.6 F colder than standard.

Section from sea level of where St Mary stands in the atmosphere, height to scale: the station 4,593 feet above sea level with 16 per cent of the air below it; the standard atmosphere's pressure there, 25.28 inches of mercury, and temperature, 42.6 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SRYM8FIG. D WHERE ST MARY STANDS IN THE ATMOSPHERESECTION FROM SEA LEVEL, HEIGHT TO SCALE, THE STATION IN THE STANDARD ATMOSPHEREFT ABOVE SEA LEVEL05,00010,00015,000SEA LEVEL, 29.92 inHg IN THE STANDARD ATMOSPHEREST MARY16 PER CENT OF THE AIR BELOW IT4,593 FT10 PER CENT OF THE AIR BELOW, 2,890 FT20 PER CENT OF THE AIR BELOW, 6,050 FT30 PER CENT OF THE AIR BELOW, 9,540 FT40 PER CENT OF THE AIR BELOW, 13,470 FTSTANDARD PRESSURE HERE25.28 inHgSTANDARD TEMPERATURE HERE42.6 FTEMPERATURE, REPORTED38.0 FTITLESt Mary, the columnSTATION REPORT · DCP SRYM8TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 3 of 5DATE2026-10-16IDSR-SRYM8-3DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The full report of St Mary, in 5 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. Mary

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

Near St. Mary

River and lake gauges