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Hornitos, California

Community in Mariposa County, California

Air quality

The air at Hornitos

Index 67, moderate, led by coarse particles. Read at 9 PM from its reporting area, Merced (CA), 19 miles off.

67Moderate
  • Fine particles (PM2.5)59Moderate-
  • Ozone24Good-
  • Coarse particles (PM10)67Moderate-

The days ahead

Moderate each day through Fri Oct 16, led by coarse particles. Yesterday measured 54, moderate.

Smoke, the next 44 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 Hornitos

None in the last 3 days, to Thu 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 Hornitos, the next 44 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

On the radar over Hornitos, CaliforniaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 7 instruments nearest Hornitos, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 5.9 miles away.

measured now5 instruments

measured daily2 instruments

Exchequer DamEXQC1

At a dam/5.9 mi away/827 ft/63 ft below here

snowfall, snow depth, precip, high, low

Rank-

Mariposa 3.7 NNWCA-MP-1

In a volunteer observer's own ground/14.3 mi away/2,942 ft/2,052 ft above here

precip, snowfall, snow depth

Rank-

Station report

The weather at Merced/Castle AF, drawn

The nearest airport reporting now, 19.7 mi from Hornitos, California. From its report of Oct 15, 2026, 7:55 PM local time: 3 of its 5 sheets.

The sky

Clear; visibility 10 mi or more.

Section of the sky over Merced/Castle AF, height above the station to scale: a clear sky, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MERFIG. A THE SKY OVER MERCED/CASTLE AFSECTION, 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 STATIONCLEARVISIBILITY, MILES: 10 MI OR MORE0510TITLEMerced/Castle AF, the skySTATION REPORT · ASOS MERTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 5DATE2026-10-16IDSR-MER-1DRAWN AS linework on paperSOURCES FB-SKY-001

The wind

Calm.

Plan of the wind at Merced/Castle AF, north up: calm; beside it the Beaufort scale from calm to hurricane force, force 0, calm, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MERFIG. C THE WIND AT MERCED/CASTLE AFPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONCALMBEAUFORT FORCELEAST WIND, MPH0CALM0NOW, 0 MPH1LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEMerced/Castle AF, the windSTATION REPORT · ASOS MERTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 2 of 5DATE2026-10-16IDSR-MER-2DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The column

At 187 ft above sea level, 1 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.72 inHg and the temperature at 58.3 F.

Section from sea level of where Merced/Castle AF stands in the atmosphere, height to scale: the station 187 feet above sea level with 1 per cent of the air below it; the standard atmosphere's pressure there, 29.72 inches of mercury, and temperature, 58.3 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MERFIG. D WHERE MERCED/CASTLE AF 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/CASTLE AF1 PER CENT OF THE AIR BELOW IT187 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 HERE29.72 inHgSTANDARD TEMPERATURE HERE58.3 FTITLEMerced/Castle AF, the columnSTATION REPORT · ASOS MERTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 3 of 5DATE2026-10-16IDSR-MER-3DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The full report of Merced/Castle AF, 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 Hornitos

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

Near Hornitos

River and lake gauges