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Grass Range, Montana

Town in Fergus County, Montana

Air quality

The air at Grass Range

Index 30, good, led by ozone. Read at 11 PM from its reporting area, Lewistown (MT), 31 miles off.

30Good
  • Fine particles (PM2.5)23Good-
  • Ozone30Good-
  • Coarse particles (PM10)4Good-

The days ahead

Yesterday measured 35, good.

Smoke, the next 43 hours

No smoke near the ground through Sat 6 PM.

FriSat

Precipitation

What has fallen at Grass Range

None in the last 3 days, to Thu 11 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 Grass Range, the next 43 hours

Visibility stays 10 miles or more through Sat 6 PM.

FriSat

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

What is measuring near here

The 5 instruments nearest Grass Range, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.1 miles away.

measured now3 instruments

GrassrangeMVH

At an airfield/14.4 mi away/4,393 ft/910 ft above here

temp, wind, gust, visibility, precip, pressure

Rank17of 1,053

measured daily2 instruments

Grass RangeGSSM8

At a cooperative observer's station/0.1 mi away/3,488 ft/5 ft above here

snowfall, snow depth, precip, high, low

Rank576of 1,053

Winnett 21.6 SSWMT-PT-2

In a volunteer observer's own ground/22.1 mi away/3,814 ft/331 ft above here

precip, snowfall, snow depth

Rank-

Station report

The weather at Grassrange, drawn

The nearest airport reporting now, 14.4 mi from Grass Range, Montana. From its report of Oct 15, 2026, 11:55 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 Grassrange, 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 MVHFIG. A THE SKY OVER GRASSRANGESECTION, 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 MORE0510TITLEGrassrange, the skySTATION REPORT · ASOS MVHTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-MVH-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

24.8 F with a dew point of 21.2 F, 86 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 Grassrange: temperature 24.8 degrees Fahrenheit and dew point 21.2, 86 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 MVHFIG. B THE AIR AT GRASSRANGETHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00010 F20 F30 F40 FSATURATES 800 FT ABOVE THE STATION, AT 20.4 FTEMPERATURE 24.8 FDEW POINT 21.2 FSPREAD 3.6 FRELATIVE HUMIDITY 86 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 POINTTITLEGrassrange, the airSTATION REPORT · ASOS MVHTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-MVH-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north northwest (340 degrees) at 6 mph: force 2, a light breeze on the Beaufort scale. The strongest gust today was 43 mph.

Plan of the wind at Grassrange, north up: blowing from 340 degrees, the north northwest, at 6 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 2, light breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MVHFIG. C THE WIND AT GRASSRANGEPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 340°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 6 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEGrassrange, the windSTATION REPORT · ASOS MVHTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-MVH-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Grassrange, in 6 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at Grass Range (GSSM8), 0.1 miles from here, read 15 Oct, 18:00. measured daily

Elsewhere in Montana

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

Near Grass Range

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

Near Grass Range

River and lake gauges