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Blackhawk, California

Community in Contra Costa County, California

Air quality

The air at Blackhawk

Index 62, moderate, led by fine particles. Read at 3 AM from its reporting area, Stockton (CA), 34 miles off.

62Moderate
  • Fine particles (PM2.5)62Moderate-
  • Ozone38Good-
  • Coarse particles (PM10)62Moderate-

The days ahead

Moderate each day through Today, led by coarse particles. Yesterday measured 67, moderate.

Smoke, the next 44 hours

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

SatSun

Precipitation

What has fallen at Blackhawk

None in the last 3 days, to Sat 3 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 Blackhawk, the next 44 hours

Visibility stays 8 miles or more through Sun 11 PM, lowest 8 miles Sun 11 PM.

SatSun

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

What is measuring near here

The 6 instruments nearest Blackhawk, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.2 miles away.

measured now4 instruments

BlackhawkBHWC1

At a river or reservoir gauge/2.9 mi away/1,804 ft/923 ft above here

temp, wind, gust, humidity, pressure

Rank609of 4,461

LivermoreLVK

At an airfield/9.3 mi away/387 ft/494 ft below here

temp, wind, gust, visibility, precip, pressure

Rank596of 4,461

measured daily2 instruments

Danville 4.9 ESECA-CC-20

In a volunteer observer's own ground/1.2 mi away/724 ft/157 ft below here

precip, snowfall, snow depth

Rank-

Diablo - Mount DiabloMDJC1

At a cooperative observer's station/5.1 mi away/3,102 ft/2,221 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Livermore, drawn

The nearest airport reporting now, 9.3 mi from Blackhawk, California. From its report of Oct 17, 2026, 3:53 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 Livermore, 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 LVKFIG. A THE SKY OVER LIVERMORESECTION, 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 MORE0510TITLELivermore, the skySTATION REPORT · ASOS LVKTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-17IDSR-LVK-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

55.0 F with a dew point of 35.0 F, 47 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 4,500 ft up.

Chart of the air at Livermore: temperature 55.0 degrees Fahrenheit and dew point 35.0, 47 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 4,500 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT LVKFIG. B THE AIR AT LIVERMORETHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,00020 F30 F40 F50 F60 F70 FSATURATES 4,500 FT ABOVE THE STATION, AT 30.8 FTEMPERATURE 55.0 FDEW POINT 35.0 FSPREAD 20.0 FRELATIVE HUMIDITY 47 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 POINTTITLELivermore, the airSTATION REPORT · ASOS LVKTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-17IDSR-LVK-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Livermore, 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 LVKFIG. C THE WIND AT LIVERMOREPLAN, 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 FORCE73TITLELivermore, the windSTATION REPORT · ASOS LVKTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-17IDSR-LVK-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Livermore, 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 Blackhawk

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

Near Blackhawk

River and lake gauges