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Monte Rio, California

Community in Sonoma County, California

Air quality

The air at Monte Rio

Index 51, moderate, led by fine particles. Read at 2 AM from its reporting area, Santa Rosa (CA), 17 miles off.

51Moderate
  • Fine particles (PM2.5)51Moderate-
  • Ozone8Good-

The days ahead

Good each day through Tue Oct 20, led by ozone. Yesterday measured 41, good.

Smoke, the next 46 hours

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

FriSat

Precipitation

What has fallen at Monte Rio

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 Monte Rio, the next 46 hours

Visibility stays 10 miles or more through Sat 11 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Monte Rio, 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

Bodega 6 WSW93245

At a climate reference station/10.8 mi away/63 ft/level with here

temp, humidity, wind, solar, precip

Rank-

measured daily2 instruments

Guerneville 2.0 SSWCA-SN-99

In a volunteer observer's own ground/1.2 mi away/69 ft/6 ft above here

precip, snowfall, snow depth

Rank-

GratonGRNC1

At a cooperative observer's station/8.4 mi away/203 ft/140 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Santa Rosa, drawn

The nearest airport reporting now, 11.1 mi from Monte Rio, California. From its report of Oct 16, 2026, 1:53 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 Santa Rosa, 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 STSFIG. A THE SKY OVER SANTA ROSASECTION, 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 MORE0510TITLESanta Rosa, the skySTATION REPORT · ASOS STSTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-STS-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

51.0 F with a dew point of 40.0 F, 66 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,500 ft up.

Chart of the air at Santa Rosa: temperature 51.0 degrees Fahrenheit and dew point 40.0, 66 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,500 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT STSFIG. B THE AIR AT SANTA ROSATHE 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 FSATURATES 2,500 FT ABOVE THE STATION, AT 37.6 FTEMPERATURE 51.0 FDEW POINT 40.0 FSPREAD 11.0 FRELATIVE HUMIDITY 66 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 POINTTITLESanta Rosa, the airSTATION REPORT · ASOS STSTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-STS-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Santa Rosa, 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 STSFIG. C THE WIND AT SANTA ROSAPLAN, 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 FORCE73TITLESanta Rosa, the windSTATION REPORT · ASOS STSTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-STS-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Santa Rosa, 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 Monte Rio

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

Near Monte Rio

River and lake gauges