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Mt. Bullion, California

Community in Mariposa County, California

Air quality

The air at Mt. Bullion

Index 141, unhealthy for sensitive groups, led by fine particles. Read at 11 PM from its reporting area, Yosemite National Park (CA), 23 miles off.

141Unhealthy for sensitive groups
  • Fine particles (PM2.5)141Unhealthy for sensitive groups-
  • Ozone40Good-

The days ahead

Yesterday measured 60, moderate.

Smoke, the next 42 hours

Little smoke near the ground through Sat 5 PM: the index from smoke stays at 6 or under.

FriSat

Precipitation

What has fallen at Mt. Bullion

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 Mt. Bullion, the next 42 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

On the radar over Mt. Bullion, CaliforniaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 7 instruments nearest Mt. Bullion, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.6 miles away.

measured now5 instruments

measured daily2 instruments

Mariposa 3.7 NNWCA-MP-1

In a volunteer observer's own ground/4.0 mi away/2,942 ft/736 ft above here

precip, snowfall, snow depth

Rank-

Exchequer DamEXQC1

At a dam/13.2 mi away/827 ft/1,379 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Merced River - Hwy 59, drawn

The nearest instrument reporting now, 2.6 mi from Mt. Bullion, California. From its report of Oct 15, 2026, 11:15 PM local time: 3 of its 5 sheets.

The air

52.7 F with a dew point of 45.7 F, 77 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,600 ft up.

Chart of the air at Merced River - Hwy 59: temperature 52.7 degrees Fahrenheit and dew point 45.7, 77 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,600 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MFNC1FIG. B THE AIR AT MERCED RIVER - HWY 59THE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00030 F40 F50 F60 FSATURATES 1,600 FT ABOVE THE STATION, AT 44.1 FTEMPERATURE 52.7 FDEW POINT 45.7 FSPREAD 7.0 FRELATIVE HUMIDITY 77 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 POINTTITLEMerced River - Hwy 59, the airSTATION REPORT · DCP MFNC1TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 5DATE2026-10-16IDSR-MFNC1-1DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northeast (46 degrees) at 1 mph: force 1, a light air on the Beaufort scale.

Plan of the wind at Merced River - Hwy 59, north up: blowing from 46 degrees, the northeast, at 1 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 MFNC1FIG. C THE WIND AT MERCED RIVER - HWY 59PLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 46°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 1 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEMerced River - Hwy 59, the windSTATION REPORT · DCP MFNC1TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 2 of 5DATE2026-10-16IDSR-MFNC1-2DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008

The column

At 2,331 ft above sea level, 8 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 27.49 inHg and the temperature at 50.7 F; it reports 52.7 F, 2.0 F warmer than standard.

Section from sea level of where Merced River - Hwy 59 stands in the atmosphere, height to scale: the station 2,331 feet above sea level with 8 per cent of the air below it; the standard atmosphere's pressure there, 27.49 inches of mercury, and temperature, 50.7 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MFNC1FIG. D WHERE MERCED RIVER - HWY 59 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 ATMOSPHEREMERCED RIVER - HWY 598 PER CENT OF THE AIR BELOW IT2,331 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 HERE27.49 inHgSTANDARD TEMPERATURE HERE50.7 FTEMPERATURE, REPORTED52.7 FTITLEMerced River - Hwy 59, the columnSTATION REPORT · DCP MFNC1TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 3 of 5DATE2026-10-16IDSR-MFNC1-3DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The full report of Merced River - Hwy 59, in 5 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in California

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

Near Mt. Bullion

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

Near Mt. Bullion

River and lake gauges