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Arnold, California

Community in Calaveras County, California

Air quality

The air at Arnold

Index 40, good, led by ozone. Read at 10 PM from its reporting area, Calaveras County (CA), 18 miles off.

40Good
  • Fine particles (PM2.5)16Good17.6 mi
  • Ozone40Good40 ppb17.6 mi
  • Coarse particles (PM10)28Good17.6 mi

The days ahead

Yesterday measured 42, good.

Smoke, the next 43 hours

No smoke near the ground through Sat 5 PM.

FriSat

Precipitation

What has fallen at Arnold

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 Arnold, the next 43 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Arnold, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.7 miles away.

measured now4 instruments

ColumbiaO22

At an airfield/15.1 mi away/2,119 ft/1,939 ft below here

temp, wind, gust, visibility, precip, pressure

Rank3,952of 4,465

measured daily2 instruments

Arnold 1.6 NNECA-CV-12

In a volunteer observer's own ground/0.7 mi away/4,023 ft/35 ft below here

precip, snowfall, snow depth

Rank-

Arnold - Calaveras Big TreesARNC1

At a cooperative observer's station/3.3 mi away/4,763 ft/705 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Columbia, drawn

The nearest airport reporting now, 15.1 mi from Arnold, California. From its report of Oct 15, 2026, 9:15 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 Columbia, 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 O22FIG. A THE SKY OVER COLUMBIASECTION, 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 MORE0510TITLEColumbia, the skySTATION REPORT · ASOS O22TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-O22-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

55.4 F with a dew point of 33.8 F, 44 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 4,900 ft up.

Chart of the air at Columbia: temperature 55.4 degrees Fahrenheit and dew point 33.8, 44 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 4,900 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT O22FIG. B THE AIR AT COLUMBIATHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,0007,00020 F30 F40 F50 F60 F70 FSATURATES 4,900 FT ABOVE THE STATION, AT 29.3 FTEMPERATURE 55.4 FDEW POINT 33.8 FSPREAD 21.6 FRELATIVE HUMIDITY 44 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 POINTTITLEColumbia, the airSTATION REPORT · ASOS O22TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-O22-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Columbia, 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 O22FIG. C THE WIND AT COLUMBIAPLAN, 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 FORCE73TITLEColumbia, the windSTATION REPORT · ASOS O22TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-O22-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Columbia, in 6 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 Arnold

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

Near Arnold

River and lake gauges