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Hamilton, Montana

City in Ravalli County, Montana

Air quality

The air at Hamilton

Index 23, good, led by fine particles. Read at 9 PM from its reporting area, Hamilton (MT), 0 miles off.

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

The days ahead

Yesterday measured 29, good.

Smoke, the next 46 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 Hamilton

None in the last 3 days, to Thu 8 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 Hamilton, the next 46 hours

Visibility stays 10 miles or more through Sat 6 PM.

FriSat

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

What is measuring near here

The 5 instruments nearest Hamilton, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.7 miles away.

measured now3 instruments

HamiltonHRF

At an airfield/1.7 mi away/3,605 ft/35 ft above here

temp, wind, gust, visibility, precip, pressure

Rank86of 1,053

measured daily2 instruments

Corvallis 1.6 SMT-RV-13

In a volunteer observer's own ground/3.5 mi away/3,514 ft/56 ft below here

precip, snowfall, snow depth

Rank-

DarbyDRBM8

At a cooperative observer's station/15.4 mi away/3,885 ft/315 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Hamilton, drawn

The nearest airport reporting now, 1.7 mi from Hamilton, Montana. From its report of Oct 15, 2026, 9:10 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 Hamilton, 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 HRFFIG. A THE SKY OVER HAMILTONSECTION, 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 MORE0510TITLEHamilton, the skySTATION REPORT · ASOS HRFTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-HRF-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

37.4 F with a dew point of 33.8 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 Hamilton: temperature 37.4 degrees Fahrenheit and dew point 33.8, 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 HRFFIG. B THE AIR AT HAMILTONTHE 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 33.0 FTEMPERATURE 37.4 FDEW POINT 33.8 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 POINTTITLEHamilton, the airSTATION REPORT · ASOS HRFTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-HRF-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south (170 degrees) at 5 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at Hamilton, north up: blowing from 170 degrees, the south, at 5 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 HRFFIG. C THE WIND AT HAMILTONPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 170°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 5 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEHamilton, the windSTATION REPORT · ASOS HRFTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-HRF-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Hamilton, 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 Hamilton

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

Near Hamilton

River and lake gauges