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Penngrove, California

Community in Sonoma County, California

Air quality

The air at Penngrove

Index 28, good, led by ozone. Read at 9 PM from its reporting area, Santa Rosa (CA), 10 miles off.

28Good
  • Fine particles (PM2.5)15Good24.1 mi
  • Ozone28Good24 ppb24.1 mi
  • Nitrogen dioxide11Good12.5 ppb24.1 mi
  • Carbon monoxide-0.4 ppm24.1 mi

The days ahead

Good each day through Wed Oct 21, led by ozone. Yesterday measured 41, good.

Smoke, the next 45 hours

Little smoke near the ground through Sun 5 PM: the index from smoke stays at 11 or under.

SatSun

Precipitation

What has fallen at Penngrove

None in the last 3 days, to Fri 8 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 Penngrove, the next 45 hours

Visibility stays 10 miles or more through Sun 5 PM.

SatSun

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

What is measuring near here

The 6 instruments nearest Penngrove, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.6 miles away.

measured now4 instruments

Bodega 6 WSW93245

At a climate reference station/21.8 mi away/63 ft/2 ft below here

temp, humidity, wind, solar, precip

Rank-

measured daily2 instruments

Cotati 1.0 SSECA-SN-131

In a volunteer observer's own ground/2.1 mi away/192 ft/127 ft above here

precip, snowfall, snow depth

Rank-

Station report

The weather at Petaluma, drawn

The nearest airport reporting now, 4.5 mi from Penngrove, California. From its report of Oct 16, 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 Petaluma, 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 O69FIG. A THE SKY OVER PETALUMASECTION, 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 MORE0510TITLEPetaluma, the skySTATION REPORT · ASOS O69TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-17IDSR-O69-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

57.2 F with a dew point of 33.8 F, 41 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 5,300 ft up.

Chart of the air at Petaluma: temperature 57.2 degrees Fahrenheit and dew point 33.8, 41 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 5,300 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT O69FIG. B THE AIR AT PETALUMATHE 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 5,300 FT ABOVE THE STATION, AT 28.9 FTEMPERATURE 57.2 FDEW POINT 33.8 FSPREAD 23.4 FRELATIVE HUMIDITY 41 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 POINTTITLEPetaluma, the airSTATION REPORT · ASOS O69TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-17IDSR-O69-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Petaluma, 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 O69FIG. C THE WIND AT PETALUMAPLAN, 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 FORCE73TITLEPetaluma, the windSTATION REPORT · ASOS O69TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-17IDSR-O69-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Petaluma, 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 Penngrove

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

Near Penngrove

River and lake gauges