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Eureka, Montana

Town in Lincoln County, Montana

Air quality

The air at Eureka

Index 68, moderate, led by fine particles. Read at 4 AM from its reporting area, Libby (MT), 41 miles off.

68Moderate
  • Fine particles (PM2.5)68Moderate-
  • Coarse particles (PM10)25Good-

The days ahead

Yesterday measured 59, moderate.

Smoke, the next 44 hours

Little smoke near the ground through Mon 12 AM: the index from smoke stays at 28 or under.

SatSun

Precipitation

What has fallen at Eureka

None in the last 3 days, to Sat 4 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 Eureka, the next 44 hours

Visibility stays 10 miles or more through Mon 12 AM.

SatSun

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

What is measuring near here

The 5 instruments nearest Eureka, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.1 miles away.

measured now3 instruments

measured daily2 instruments

Eureka Ranger StationERKM8

At a fire lookout or ranger station/1.2 mi away/2,635 ft/31 ft below here

snowfall, snow depth, precip, high, low

Rank-

Eureka 3.4 NNWMT-LN-4

In a volunteer observer's own ground/3.0 mi away/2,791 ft/125 ft above here

precip, snowfall, snow depth

Rank-

Station report

The weather at Eureka 1N - Ranger Stn, drawn

The nearest instrument reporting now, 1.1 mi from Eureka, Montana. From its report of Oct 17, 2026, 4:30 AM local time: 3 of its 4 sheets.

The air

33.2 F with a dew point of 29.3 F, 85 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 900 ft up.

Chart of the air at Eureka 1N - Ranger Stn: temperature 33.2 degrees Fahrenheit and dew point 29.3, 85 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 900 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ERKM8FIG. B THE AIR AT EUREKA 1N - RANGER STNTHE 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 900 FT ABOVE THE STATION, AT 28.4 FTEMPERATURE 33.2 FDEW POINT 29.3 FSPREAD 3.9 FRELATIVE HUMIDITY 85 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 POINTTITLEEureka 1N - Ranger Stn, the airSTATION REPORT · DCP ERKM8TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 4DATE2026-10-17IDSR-ERKM8-1DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The column

At 2,615 ft above sea level, 9 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 27.20 inHg and the temperature at 49.7 F; it reports 33.2 F, 16.5 F colder than standard.

Section from sea level of where Eureka 1N - Ranger Stn stands in the atmosphere, height to scale: the station 2,615 feet above sea level with 9 per cent of the air below it; the standard atmosphere's pressure there, 27.20 inches of mercury, and temperature, 49.7 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ERKM8FIG. D WHERE EUREKA 1N - RANGER STN 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 ATMOSPHEREEUREKA 1N - RANGER STN9 PER CENT OF THE AIR BELOW IT2,615 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 HERE27.20 inHgSTANDARD TEMPERATURE HERE49.7 FTEMPERATURE, REPORTED33.2 FTITLEEureka 1N - Ranger Stn, the columnSTATION REPORT · DCP ERKM8TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 4DATE2026-10-17IDSR-ERKM8-2DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The sun

On Oct 17 the noon sun stands 32 degrees above the horizon at 48.90 N, and the day is 10 h 32 min long. Level ground there takes 52 per cent of the noon sunlight a surface facing the sun would.

Elevation of the noon sun at Eureka 1N - Ranger Stn, angles true: on Oct 17 it stands 32 degrees above the horizon, against 65 at the June solstice, 41 at the equinoxes and 18 at the December solstice; the day is 10 h 32 min long.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ERKM8FIG. E THE SUN AT EUREKA 1N - RANGER STNELEVATION LOOKING WEST, SOUTH TO THE LEFT: THE NOON SUN ON THE DAY OF THE REPORT, AND AT THE SOLSTICES AND EQUINOXES; ANGLES TRUETHE STATIONJUNE SOLSTICE 65°EQUINOXES 41°DECEMBER SOLSTICE 18°OCT 17, 32°SOUTHANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLYDAY LENGTH 10 H 32 MINLEVEL GROUND TAKES 52 PER CENT OF THE NOON SUN A FACING SURFACE WOULDLATITUDE 48.90 N; THE SUN'S DECLINATION -9.5°TITLEEureka 1N - Ranger Stn, the sunSTATION REPORT · DCP ERKM8TYPEELEVATIONSCALEANGLES TRUEREVAS REPORTED SHEET 3 of 4DATE2026-10-17IDSR-ERKM8-3DRAWN AS linework on paperSOURCES FB-ENG-007

The full report of Eureka 1N - Ranger Stn, in 4 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 Eureka

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

Near Eureka

River and lake gauges