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Pomona, California

City in Los Angeles County, California

Air quality

The air at Pomona

Index 38, good, led by ozone. Read at 5 AM from its reporting area, E San Gabriel Vly (CA), 9 miles off.

38Good
  • Fine particles (PM2.5)6Good8.2 mi
  • Ozone38Good41 ppb8.2 mi
  • Coarse particles (PM10)21Good8.2 mi
  • Nitrogen dioxide2Good2.8 ppb7.9 mi
  • Sulfur dioxide0Good0.1 ppb15 mi
  • Carbon monoxide-0.1 ppm12.8 mi

The days ahead

Good each day through Today, led by ozone. Yesterday measured 44, good.

Smoke, the next 43 hours

Little smoke near the ground through Sat 11 PM: the index from smoke stays at 17 or under.

FriSat

Precipitation

What has fallen at Pomona

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 Pomona, the next 43 hours

Visibility stays 10 miles or more through Sat 11 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Pomona, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.6 miles away.

measured now4 instruments

measured daily2 instruments

La Verne 1.1 ESECA-LA-152

In a volunteer observer's own ground/3.5 mi away/1,222 ft/341 ft above here

precip, snowfall, snow depth

Rank-

Covina YardCTFC1

At a cooperative observer's station/7.6 mi away/594 ft/287 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Citizen station GW1944, drawn

The nearest instrument reporting now, 4.6 mi from Pomona, California. From its report of undefined: 3 of its 4 sheets.

The wind

Calm.

Plan of the wind at Citizen station GW1944, 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 GW1944FIG. C THE WIND AT CITIZEN STATION GW1944PLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONCALMBEAUFORT FORCELEAST WIND, MPH0CALM0NOW, 0 MPH1LIGHT AIR1GUST, 1 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLECitizen station GW1944, the windSTATION REPORT · CWOP GW1944TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 1 of 4DATE2026-10-16IDSR-GW1944-1DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008

The column

At 1,562 ft above sea level, 6 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 28.27 inHg and the temperature at 53.4 F; the station's altimeter setting of 30.04 inHg means its barometer reads 28.38 inHg; it reports 68.0 F, 14.6 F warmer than standard.

Section from sea level of where Citizen station GW1944 stands in the atmosphere, height to scale: the station 1,562 feet above sea level with 6 per cent of the air below it; the standard atmosphere's pressure there, 28.27 inches of mercury, and temperature, 53.4 degrees Fahrenheit; the altimeter setting of 30.04 and the station pressure it means, 28.38.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT GW1944FIG. D WHERE CITIZEN STATION GW1944 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 ATMOSPHERECITIZEN STATION GW19446 PER CENT OF THE AIR BELOW IT1,562 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 HERE28.27 inHgSTANDARD TEMPERATURE HERE53.4 FALTIMETER SETTING, REPORTED30.04 inHgITS BAROMETER READS28.38 inHgTEMPERATURE, REPORTED68.0 FTITLECitizen station GW1944, the columnSTATION REPORT · CWOP GW1944TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 4DATE2026-10-16IDSR-GW1944-2DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The sun

On Oct 16 the noon sun stands 47 degrees above the horizon at 34.13 N, and the day is 11 h 10 min long. Level ground there takes 73 per cent of the noon sunlight a surface facing the sun would.

Elevation of the noon sun at Citizen station GW1944, angles true: on Oct 16 it stands 47 degrees above the horizon, against 79 at the June solstice, 56 at the equinoxes and 32 at the December solstice; the day is 11 h 10 min long.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT GW1944FIG. E THE SUN AT CITIZEN STATION GW1944ELEVATION 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 79°EQUINOXES 56°DECEMBER SOLSTICE 32°OCT 16, 47°SOUTHANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLYDAY LENGTH 11 H 10 MINLEVEL GROUND TAKES 73 PER CENT OF THE NOON SUN A FACING SURFACE WOULDLATITUDE 34.13 N; THE SUN'S DECLINATION -9.1°TITLECitizen station GW1944, the sunSTATION REPORT · CWOP GW1944TYPEELEVATIONSCALEANGLES TRUEREVAS REPORTED SHEET 3 of 4DATE2026-10-16IDSR-GW1944-3DRAWN AS linework on paperSOURCES FB-ENG-007

The full report of Citizen station GW1944, 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 Pomona

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

Near Pomona

River and lake gauges