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Day Valley, California

Community in Santa Cruz County, California

Air quality

The air at Day Valley

Index 28, good, led by fine particles. Read at 5 AM from its reporting area, Santa Cruz (CA), 8 miles off.

28Good
  • Fine particles (PM2.5)28Good7.7 mi
  • Ozone21Good26 ppb7.7 mi
  • Nitrogen dioxide8Good8 ppb24.6 mi
  • Carbon monoxide-0 ppm24.6 mi

The days ahead

Good each day through Sun Oct 18, led by ozone. Yesterday measured 50, good.

Smoke, the next 43 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 Day Valley

None in the last 3 days, to Fri 4 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 Day Valley, the next 43 hours

Visibility stays 10 miles or more through Sat 11 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Day Valley, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.7 miles away.

measured now4 instruments

measured daily2 instruments

Watsonville 4.4 NWCA-SZ-57

In a volunteer observer's own ground/3.0 mi away/399 ft/220 ft below here

precip, snowfall, snow depth

Rank-

Watsonville WaterworksWVIC1

At a cooperative observer's station/6.8 mi away/102 ft/517 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Watsonville, drawn

The nearest airport reporting now, 5.6 mi from Day Valley, California. From its report of Oct 16, 2026, 4:53 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 Watsonville, 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 WVIFIG. A THE SKY OVER WATSONVILLESECTION, 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 MORE0510TITLEWatsonville, the skySTATION REPORT · ASOS WVITYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-WVI-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

54.0 F with a dew point of 39.0 F, 57 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 3,400 ft up.

Chart of the air at Watsonville: temperature 54.0 degrees Fahrenheit and dew point 39.0, 57 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 3,400 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT WVIFIG. B THE AIR AT WATSONVILLETHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,00020 F30 F40 F50 F60 FSATURATES 3,400 FT ABOVE THE STATION, AT 35.7 FTEMPERATURE 54.0 FDEW POINT 39.0 FSPREAD 15.0 FRELATIVE HUMIDITY 57 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 POINTTITLEWatsonville, the airSTATION REPORT · ASOS WVITYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-WVI-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northwest (320 degrees) at 3 mph: force 1, a light air on the Beaufort scale.

Plan of the wind at Watsonville, north up: blowing from 320 degrees, the northwest, 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 WVIFIG. C THE WIND AT WATSONVILLEPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 320°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 3 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEWatsonville, the windSTATION REPORT · ASOS WVITYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-WVI-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Watsonville, 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 Day Valley

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

Near Day Valley

River and lake gauges