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Arco, Idaho

City in Butte County, Idaho

Air quality

The air at Arco

Index 34, good, led by ozone. Read at 10 PM from its reporting area, Craters of the Moon National Monument (ID), 18 miles off.

34Good
  • Ozone34Good-

The days ahead

Yesterday measured 35, good.

Smoke, the next 45 hours

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

SatSun

Precipitation

What has fallen at Arco

None in the last 3 days, to Fri 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 Arco, the next 45 hours

Visibility stays 10 miles or more through Sun 6 PM.

SatSun

On the radar over Arco, IdahoReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 5 instruments nearest Arco, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.2 miles away.

measured now3 instruments

Arco 17 SW04126

At a climate reference station/17.3 mi away/5,920 ft/595 ft above here

temp, humidity, wind, solar, precip

Rank489of 840

D6 - PuzzleITD95

Beside a road/22.6 mi away/4,934 ft/391 ft below here

temp, pavement temp, wind, visibility, precip

Rank708of 840

measured daily2 instruments

ArcoAROI1

At a cooperative observer's station/0.2 mi away/5,331 ft/6 ft above here

snowfall, snow depth, precip, high, low

Rank-

Arco 0.9 ESEID-BT-1

In a volunteer observer's own ground/1.1 mi away/5,333 ft/8 ft above here

precip, snowfall, snow depth

Rank-

Station report

The weather at Arco 17 SW, drawn

The nearest instrument reporting now, 17.3 mi from Arco, Idaho. From its report of Oct 16, 2026, 9:00 PM local time: 3 of its 5 sheets.

The air

48.0 F with a dew point of 26.0 F, 42 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 5,000 ft up.

Chart of the air at Arco 17 SW: temperature 48.0 degrees Fahrenheit and dew point 26.0, 42 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 5,000 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 04126FIG. B THE AIR AT ARCO 17 SWTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,0007,00010 F20 F30 F40 F50 F60 FSATURATES 5,000 FT ABOVE THE STATION, AT 21.5 FTEMPERATURE 48.0 FDEW POINT 26.0 FSPREAD 22.0 FRELATIVE HUMIDITY 42 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 POINTTITLEArco 17 SW, the airSTATION REPORT · USCRN 04126TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 5DATE2026-10-17IDSR-04126-1DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

At 3 mph: force 1, a light air on the Beaufort scale.

Plan of the wind at Arco 17 SW, north up: at 3 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 1, light air, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 04126FIG. C THE WIND AT ARCO 17 SWPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONDIRECTION NOT REPORTEDBEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 3 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEArco 17 SW, the windSTATION REPORT · USCRN 04126TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 2 of 5DATE2026-10-17IDSR-04126-2DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008

The column

At 5,920 ft above sea level, 20 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 24.05 inHg and the temperature at 37.9 F; it reports 48.0 F, 10.1 F warmer than standard.

Section from sea level of where Arco 17 SW stands in the atmosphere, height to scale: the station 5,920 feet above sea level with 20 per cent of the air below it; the standard atmosphere's pressure there, 24.05 inches of mercury, and temperature, 37.9 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 04126FIG. D WHERE ARCO 17 SW 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 ATMOSPHEREARCO 17 SW20 PER CENT OF THE AIR BELOW IT5,920 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 HERE24.05 inHgSTANDARD TEMPERATURE HERE37.9 FTEMPERATURE, REPORTED48.0 FTITLEArco 17 SW, the columnSTATION REPORT · USCRN 04126TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 3 of 5DATE2026-10-17IDSR-04126-3DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The full report of Arco 17 SW, in 5 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in Idaho

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

Near Arco

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

Near Arco

River and lake gauges