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Jamestown, California

Community in Tuolumne County, California

Air quality

The air at Jamestown

Index 30, good, led by ozone. Read at 2 AM from its reporting area, Tuolumne County (CA), 9 miles off.

30Good
  • Ozone30Good-

Smoke, the next 46 hours

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

FriSat

Precipitation

What has fallen at Jamestown

None in the last 3 days, to Fri 1 AM. 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 Jamestown, the next 46 hours

Visibility stays 10 miles or more through Sat 11 PM.

FriSat

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

What is measuring near here

The 7 instruments nearest Jamestown, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.8 miles away.

measured now5 instruments

SonoraWXSC1

At a river or reservoir gauge/5.0 mi away/2,218 ft/715 ft above here

temp, wind, gust, humidity, pressure

Rank2,911of 4,465

ColumbiaO22

At an airfield/5.3 mi away/2,119 ft/616 ft above here

temp, wind, gust, visibility, precip, pressure

Rank3,952of 4,465

measured daily2 instruments

SonoraSONC1

At a cooperative observer's station/1.8 mi away/1,726 ft/223 ft above here

snowfall, snow depth, precip, high, low

Rank126of 4,465

Sonora 0.6 WNWCA-TM-8

In a volunteer observer's own ground/2.6 mi away/1,873 ft/370 ft above here

precip, snowfall, snow depth

Rank-

Station report

The weather at Columbia, drawn

The nearest airport reporting now, 5.3 mi from Jamestown, California. From its report of Oct 16, 2026, 2:35 AM 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

60.8 F with a dew point of 26.6 F, 27 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 7,700 ft up.

Chart of the air at Columbia: temperature 60.8 degrees Fahrenheit and dew point 26.6, 27 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 7,700 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 STATION02,0004,0006,0008,00010,00010 F20 F30 F40 F50 F60 F70 FSATURATES 7,700 FT ABOVE THE STATION, AT 19.7 FTEMPERATURE 60.8 FDEW POINT 26.6 FSPREAD 34.2 FRELATIVE HUMIDITY 27 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

At 3 mph: force 1, a light air on the Beaufort scale.

Plan of the wind at Columbia, north up: at 3 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 O22FIG. C THE WIND AT COLUMBIAPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONDIRECTION NOT REPORTEDBEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 3 MPH2LIGHT 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

0in

Snow on the ground

Measured at Sonora (SONC1), 1.8 miles from here, read 15 Oct, 06:30. measured daily

Elsewhere in California

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

Near Jamestown

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

Near Jamestown

River and lake gauges