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Mountain Ranch, California

Community in Calaveras County, California

Air quality

The air at Mountain Ranch

Index 40, good, led by ozone. Read at 10 PM from its reporting area, Calaveras County (CA), 9 miles off.

40Good
  • Fine particles (PM2.5)16Good8.8 mi
  • Ozone40Good40 ppb8.8 mi
  • Coarse particles (PM10)28Good8.8 mi

The days ahead

Yesterday measured 42, good.

Smoke, the next 43 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 Mountain Ranch

None in the last 3 days, to Thu 10 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 Mountain Ranch, the next 43 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Mountain Ranch, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.9 miles away.

measured now4 instruments

EsperanzaESPC1

At a river or reservoir gauge/1.9 mi away/2,516 ft/561 ft above here

temp, wind, gust, humidity, pressure

Rank980of 4,465

measured daily2 instruments

Mountain Ranch 3.7 NECA-CV-16

In a volunteer observer's own ground/4.0 mi away/2,392 ft/437 ft above here

precip, snowfall, snow depth

Rank-

San AndreasADSC1

At a cooperative observer's station/8.6 mi away/1,030 ft/925 ft below here

snowfall, snow depth, precip, high, low

Rank2,329of 4,465

Station report

The weather at San Andreas, drawn

The nearest airport reporting now, 8.4 mi from Mountain Ranch, California. From its report of Oct 15, 2026, 10:55 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 San Andreas, 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 CPUFIG. A THE SKY OVER SAN ANDREASSECTION, 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 MORE0510TITLESan Andreas, the skySTATION REPORT · ASOS CPUTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-CPU-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

60.0 F with a dew point of 32.0 F, 35 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 6,300 ft up.

Chart of the air at San Andreas: temperature 60.0 degrees Fahrenheit and dew point 32.0, 35 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 6,300 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CPUFIG. B THE AIR AT SAN ANDREASTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,0007,0008,00020 F30 F40 F50 F60 F70 FSATURATES 6,300 FT ABOVE THE STATION, AT 26.2 FTEMPERATURE 60.0 FDEW POINT 32.0 FSPREAD 28.0 FRELATIVE HUMIDITY 35 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 POINTTITLESan Andreas, the airSTATION REPORT · ASOS CPUTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-CPU-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at San Andreas, 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 CPUFIG. C THE WIND AT SAN ANDREASPLAN, 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 FORCE73TITLESan Andreas, the windSTATION REPORT · ASOS CPUTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-CPU-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of San Andreas, in 6 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at San Andreas (ADSC1), 8.6 miles from here, read 15 Oct, 07:00. measured daily

Elsewhere in California

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

Near Mountain Ranch

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

Near Mountain Ranch

River and lake gauges