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Granite Bay, California

Community in Placer County, California

Air quality

The air at Granite Bay

Index 48, good, led by fine particles. Read at 4 AM from its reporting area, Roseville-Rocklin (CA), 5 miles off.

48Good
  • Fine particles (PM2.5)48Good4.7 mi
  • Ozone24Good39 ppb4.7 mi
  • Coarse particles (PM10)28Good-
  • Nitrogen dioxide2Good2 ppb4.7 mi
  • Carbon monoxide-0.4 ppm20.5 mi

The days ahead

Highest 58, moderate, today, led by ozone. Yesterday measured 35, good.

Smoke, the next 44 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 Granite Bay

None in the last 3 days, to Fri 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 Granite Bay, the next 44 hours

Visibility stays 10 miles or more through Sat 11 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Granite Bay, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.8 miles away.

measured now4 instruments

measured daily2 instruments

Roseville 3.3 ECA-PC-56

In a volunteer observer's own ground/2.9 mi away/304 ft/46 ft below here

precip, snowfall, snow depth

Rank-

AuburnAUBC1

At a cooperative observer's station/12.3 mi away/1,312 ft/962 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Roseville Wtr Tr Plant, drawn

The nearest instrument reporting now, 2.8 mi from Granite Bay, California. From its report of Oct 16, 2026, 3:53 AM local time: 3 of its 4 sheets.

The air

57.9 F with a dew point of 44.8 F, 62 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 3,000 ft up.

Chart of the air at Roseville Wtr Tr Plant: temperature 57.9 degrees Fahrenheit and dew point 44.8, 62 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 3,000 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RTPC1FIG. B THE AIR AT ROSEVILLE WTR TR PLANTTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,00030 F40 F50 F60 F70 FSATURATES 3,000 FT ABOVE THE STATION, AT 41.9 FTEMPERATURE 57.9 FDEW POINT 44.8 FSPREAD 13.1 FRELATIVE HUMIDITY 62 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 POINTTITLERoseville Wtr Tr Plant, the airSTATION REPORT · DCP RTPC1TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 4DATE2026-10-16IDSR-RTPC1-1DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The column

At 226 ft above sea level, 1 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.68 inHg and the temperature at 58.2 F; it reports 57.9 F, 0.3 F colder than standard.

Section from sea level of where Roseville Wtr Tr Plant stands in the atmosphere, height to scale: the station 226 feet above sea level with 1 per cent of the air below it; the standard atmosphere's pressure there, 29.68 inches of mercury, and temperature, 58.2 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RTPC1FIG. D WHERE ROSEVILLE WTR TR PLANT STANDS IN THE ATMOSPHERESECTION FROM SEA LEVEL, HEIGHT TO SCALE, THE STATION IN THE STANDARD ATMOSPHEREFT ABOVE SEA LEVEL05,00010,00015,000SEA LEVEL, 29.92 inHg IN THE STANDARD ATMOSPHEREROSEVILLE WTR TR PLANT1 PER CENT OF THE AIR BELOW IT226 FT10 PER CENT OF THE AIR BELOW, 2,890 FT20 PER CENT OF THE AIR BELOW, 6,050 FT30 PER CENT OF THE AIR BELOW, 9,540 FT40 PER CENT OF THE AIR BELOW, 13,470 FTSTANDARD PRESSURE HERE29.68 inHgSTANDARD TEMPERATURE HERE58.2 FTEMPERATURE, REPORTED57.9 FTITLERoseville Wtr Tr Plant, the columnSTATION REPORT · DCP RTPC1TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 4DATE2026-10-16IDSR-RTPC1-2DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The sun

On Oct 16 the noon sun stands 42 degrees above the horizon at 38.73 N, and the day is 11 h 01 min long. Level ground there takes 67 per cent of the noon sunlight a surface facing the sun would.

Elevation of the noon sun at Roseville Wtr Tr Plant, angles true: on Oct 16 it stands 42 degrees above the horizon, against 75 at the June solstice, 51 at the equinoxes and 28 at the December solstice; the day is 11 h 01 min long.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RTPC1FIG. E THE SUN AT ROSEVILLE WTR TR PLANTELEVATION LOOKING WEST, SOUTH TO THE LEFT: THE NOON SUN ON THE DAY OF THE REPORT, AND AT THE SOLSTICES AND EQUINOXES; ANGLES TRUETHE STATIONJUNE SOLSTICE 75°EQUINOXES 51°DECEMBER SOLSTICE 28°OCT 16, 42°SOUTHANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLYDAY LENGTH 11 H 01 MINLEVEL GROUND TAKES 67 PER CENT OF THE NOON SUN A FACING SURFACE WOULDLATITUDE 38.73 N; THE SUN'S DECLINATION -9.1°TITLERoseville Wtr Tr Plant, the sunSTATION REPORT · DCP RTPC1TYPEELEVATIONSCALEANGLES TRUEREVAS REPORTED SHEET 3 of 4DATE2026-10-16IDSR-RTPC1-3DRAWN AS linework on paperSOURCES FB-ENG-007

The full report of Roseville Wtr Tr Plant, in 4 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 Granite Bay

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

Near Granite Bay

River and lake gauges