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San Andreas, California

Community in Calaveras County, California

Air quality

The air at San Andreas

Index 58, moderate, led by ozone. Read at 4 PM from its reporting area, Calaveras County (CA), 1 mile off.

58Moderate
  • Fine particles (PM2.5)13Good-
  • Ozone58Moderate-
  • Coarse particles (PM10)24Good-

The days ahead

Yesterday measured 49, good.

Smoke, the next 43 hours

Little smoke near the ground through Sun 11 AM: the index from smoke stays at 6 or under.

FriSatSun

Precipitation

What has fallen at San Andreas

None in the last 3 days, to Fri 4 PM. Measured by radar and rain gauges, as water.

Last 24 hours
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Last 3 days
0.00in

Visibility

How far you can see at San Andreas, the next 43 hours

Visibility stays 10 miles or more through Sun 11 AM.

FriSatSun

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

What is measuring near here

The 6 instruments nearest San Andreas, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.6 miles away.

measured now4 instruments

measured daily2 instruments

San AndreasADSC1

At a cooperative observer's station/0.6 mi away/1,030 ft/65 ft below here

snowfall, snow depth, precip, high, low

Rank2,317of 4,461

San Andreas 1.1 ENECA-CV-3

In a volunteer observer's own ground/1.0 mi away/1,317 ft/222 ft above here

precip, snowfall, snow depth

Rank-

Station report

The weather at San Andreas, drawn

The nearest airport reporting now, 3.5 mi from San Andreas, California. From its report of Oct 16, 2026, 4:35 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

86.0 F with a dew point of 27.0 F, 12 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 13,200 ft up.

Chart of the air at San Andreas: temperature 86.0 degrees Fahrenheit and dew point 27.0, 12 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 13,200 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 STATION02,0004,0006,0008,00010,00012,00014,00016,0000 F20 F40 F60 F80 F100 FSATURATES 13,200 FT ABOVE THE STATION, AT 15.5 FTEMPERATURE 86.0 FDEW POINT 27.0 FSPREAD 59.0 FRELATIVE HUMIDITY 12 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

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Snow on the ground

Measured at San Andreas (ADSC1), 0.6 miles from here, read 16 Oct, 07:00. measured daily

Elsewhere in California

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

Near San Andreas

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

Near San Andreas

River and lake gauges