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Seneca, Illinois

Village in LaSalle County, Illinois

Air quality

The air at Seneca

Index 18, good, led by ozone. Read at 5 AM from its reporting area, Joliet and Will County (IL), 25 miles off.

18Good
  • Fine particles (PM2.5)6Good-
  • Ozone18Good19 ppb22.6 mi

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 19, good.

Smoke, the next 44 hours

No smoke near the ground through Mon 1 AM.

SatSun

Precipitation

What has fallen at Seneca

None in the last 24 hours; 0.89 in over the last 3 days, to Sat 5 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.89in

Visibility

How far you can see at Seneca, the next 44 hours

Visibility stays 10 miles or more through Mon 1 AM.

SatSun

On the radar over Seneca, IllinoisReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 7 instruments nearest Seneca, 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 now5 instruments

Morris-WashburnC09

At an airfield/12.7 mi away/584 ft/75 ft above here

temp, wind, gust, visibility, precip, pressure

Rank-

measured daily2 instruments

Seneca 1.2 NNEIL-LS-50

In a volunteer observer's own ground/0.7 mi away/513 ft/4 ft above here

precip, snowfall, snow depth

Rank-

Marseilles LockMMOI2

At a cooperative observer's station/7.5 mi away/489 ft/20 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Marseilles, drawn

The nearest instrument reporting now, 7.9 mi from Seneca, Illinois. From its report of Oct 17, 2026, 5:00 AM local time: 3 of its 4 sheets.

The wind

From the north (2 degrees) at 2 mph: force 1, a light air on the Beaufort scale.

Plan of the wind at Marseilles, north up: blowing from 2 degrees, the north, at 2 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 MMPI2FIG. C THE WIND AT MARSEILLESPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 2°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 2 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEMarseilles, the windSTATION REPORT · DCP MMPI2TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 1 of 4DATE2026-10-17IDSR-MMPI2-1DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008

The column

At 486 ft above sea level, 2 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.40 inHg and the temperature at 57.3 F; it reports 42.1 F, 15.2 F colder than standard.

Section from sea level of where Marseilles stands in the atmosphere, height to scale: the station 486 feet above sea level with 2 per cent of the air below it; the standard atmosphere's pressure there, 29.40 inches of mercury, and temperature, 57.3 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MMPI2FIG. D WHERE MARSEILLES 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 ATMOSPHEREMARSEILLES2 PER CENT OF THE AIR BELOW IT486 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 HERE29.40 inHgSTANDARD TEMPERATURE HERE57.3 FTEMPERATURE, REPORTED42.1 FTITLEMarseilles, the columnSTATION REPORT · DCP MMPI2TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 4DATE2026-10-17IDSR-MMPI2-2DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The sun

On Oct 17 the noon sun stands 39 degrees above the horizon at 41.33 N, and the day is 10 h 53 min long. Level ground there takes 63 per cent of the noon sunlight a surface facing the sun would.

Elevation of the noon sun at Marseilles, angles true: on Oct 17 it stands 39 degrees above the horizon, against 72 at the June solstice, 49 at the equinoxes and 25 at the December solstice; the day is 10 h 53 min long.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MMPI2FIG. E THE SUN AT MARSEILLESELEVATION 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 72°EQUINOXES 49°DECEMBER SOLSTICE 25°OCT 17, 39°SOUTHANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLYDAY LENGTH 10 H 53 MINLEVEL GROUND TAKES 63 PER CENT OF THE NOON SUN A FACING SURFACE WOULDLATITUDE 41.33 N; THE SUN'S DECLINATION -9.4°TITLEMarseilles, the sunSTATION REPORT · DCP MMPI2TYPEELEVATIONSCALEANGLES TRUEREVAS REPORTED SHEET 3 of 4DATE2026-10-17IDSR-MMPI2-3DRAWN AS linework on paperSOURCES FB-ENG-007

The full report of Marseilles, in 4 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in Illinois

23 places, each with its own forecast and its own instruments.

Near Seneca

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

Near Seneca

River and lake gauges