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Folsom, California

City in Sacramento County, California

Air quality

The air at Folsom

Index 36, good, led by ozone. Read at 5 AM from its reporting area, Folsom (CA), 1 mile off.

36Good
  • Fine particles (PM2.5)26Good1.6 mi
  • Ozone36Good25 ppb16.9 mi

The days ahead

Highest 54, moderate, Sat Oct 17, led by ozone. Yesterday measured 50, good.

Smoke, the next 42 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 Folsom

None in the last 3 days, to Fri 5 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 Folsom, the next 42 hours

Visibility stays 10 miles or more through Sat 11 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Folsom, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.7 miles away.

measured now4 instruments

measured daily2 instruments

Folsom 0.5 WCA-SA-31

In a volunteer observer's own ground/0.7 mi away/335 ft/6 ft above here

precip, snowfall, snow depth

Rank-

Lake SolanoLSOC1

At a cooperative observer's station/14.5 mi away/462 ft/133 ft above here

snowfall, snow depth, precip, high, low

Rank204of 4,465

Station report

The weather at Citizen station DW8427, drawn

The nearest instrument reporting now, 1.1 mi from Folsom, California. From its report of undefined: 3 of its 4 sheets.

The wind

Calm.

Plan of the wind at Citizen station DW8427, 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 DW8427FIG. C THE WIND AT CITIZEN STATION DW8427PLAN, 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 FORCE73TITLECitizen station DW8427, the windSTATION REPORT · CWOP DW8427TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 1 of 4DATE2026-10-16IDSR-DW8427-1DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008

The column

At 286 ft above sea level, 1 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.61 inHg and the temperature at 58.0 F; the station's altimeter setting of 30.06 inHg means its barometer reads 29.75 inHg; it reports 55.0 F, 3.0 F colder than standard.

Section from sea level of where Citizen station DW8427 stands in the atmosphere, height to scale: the station 286 feet above sea level with 1 per cent of the air below it; the standard atmosphere's pressure there, 29.61 inches of mercury, and temperature, 58.0 degrees Fahrenheit; the altimeter setting of 30.06 and the station pressure it means, 29.75.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DW8427FIG. D WHERE CITIZEN STATION DW8427 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 DW84271 PER CENT OF THE AIR BELOW IT286 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 HERE29.61 inHgSTANDARD TEMPERATURE HERE58.0 FALTIMETER SETTING, REPORTED30.06 inHgITS BAROMETER READS29.75 inHgTEMPERATURE, REPORTED55.0 FTITLECitizen station DW8427, the columnSTATION REPORT · CWOP DW8427TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 4DATE2026-10-16IDSR-DW8427-2DRAWN 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 38.66 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 Citizen station DW8427, 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 DW8427FIG. E THE SUN AT CITIZEN STATION DW8427ELEVATION 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 38.66 N; THE SUN'S DECLINATION -9.1°TITLECitizen station DW8427, the sunSTATION REPORT · CWOP DW8427TYPEELEVATIONSCALEANGLES TRUEREVAS REPORTED SHEET 3 of 4DATE2026-10-16IDSR-DW8427-3DRAWN AS linework on paperSOURCES FB-ENG-007

The full report of Citizen station DW8427, 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 Folsom

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

Near Folsom

River and lake gauges