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Rapelje, Montana

Community in Stillwater County, Montana

Air quality

The air at Rapelje

Index 23, good, led by fine particles. Read at 2 AM from its reporting area, Billings (MT), 38 miles off.

23Good
  • Fine particles (PM2.5)23Good-
  • Ozone15Good-

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 Rapelje

None in the last 3 days, to Fri 1 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 Rapelje, the next 41 hours

Visibility stays 10 miles or more through Sat 6 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Rapelje, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 12.2 miles away.

measured now4 instruments

Laurel6S8

At an airfield/30.3 mi away/3,470 ft/596 ft below here

temp, wind, gust, visibility, precip, pressure

Rank-

measured daily2 instruments

Gibson 2 NEGBNM8

At a cooperative observer's station/12.2 mi away/4,432 ft/366 ft above here

snowfall, snow depth, precip, high, low

Rank-

Ryegate 5.0 S (Closed)MT-GV-6

In a volunteer observer's own ground/17.6 mi away/3,983 ft/83 ft below here

precip, snowfall, snow depth

Rank-

Station report

The weather at Reedpoint I-90 MP 390.8, drawn

The nearest instrument reporting now, 23.6 mi from Rapelje, Montana. From its report of Oct 16, 2026, 2:15 AM local time: 3 of its 5 sheets.

The air

28.0 F with a dew point of 27.3 F, 97 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 200 ft up.

Chart of the air at Reedpoint I-90 MP 390.8: temperature 28.0 degrees Fahrenheit and dew point 27.3, 97 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 200 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MTRDPFIG. B THE AIR AT REEDPOINT I-90 MP 390.8THE 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 FSATURATES 200 FT ABOVE THE STATION, AT 27.1 FTEMPERATURE AND DEW POINT 28.0 F, 27.3 FRELATIVE HUMIDITY 97 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 POINTTITLEReedpoint I-90 MP 390.8, the airSTATION REPORT · RWIS MTRDPTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 5DATE2026-10-16IDSR-MTRDP-1DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Reedpoint I-90 MP 390.8, 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 MTRDPFIG. C THE WIND AT REEDPOINT I-90 MP 390.8PLAN, 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 FORCE73TITLEReedpoint I-90 MP 390.8, the windSTATION REPORT · RWIS MTRDPTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 2 of 5DATE2026-10-16IDSR-MTRDP-2DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008

The column

At 3,783 ft above sea level, 13 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 26.05 inHg and the temperature at 45.5 F; it reports 28.0 F, 17.5 F colder than standard.

Section from sea level of where Reedpoint I-90 MP 390.8 stands in the atmosphere, height to scale: the station 3,783 feet above sea level with 13 per cent of the air below it; the standard atmosphere's pressure there, 26.05 inches of mercury, and temperature, 45.5 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MTRDPFIG. D WHERE REEDPOINT I-90 MP 390.8 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 ATMOSPHEREREEDPOINT I-90 MP 390.813 PER CENT OF THE AIR BELOW IT3,783 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 HERE26.05 inHgSTANDARD TEMPERATURE HERE45.5 FTEMPERATURE, REPORTED28.0 FTITLEReedpoint I-90 MP 390.8, the columnSTATION REPORT · RWIS MTRDPTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 3 of 5DATE2026-10-16IDSR-MTRDP-3DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The full report of Reedpoint I-90 MP 390.8, 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 Rapelje

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

Near Rapelje

River and lake gauges