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West Alton, Missouri

City in St. Charles County, Missouri

Air quality

The air at West Alton

Index 19, good, led by ozone. Read at 2 AM from its reporting area, St. Louis (Metro-east) (IL), 25 miles off.

19Good
  • Fine particles (PM2.5)9Good-
  • Ozone19Good-
  • Coarse particles (PM10)4Good-

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 39, good.

Smoke, the next 41 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at West Alton

0.33 in in the last 24 hours, 1.10 in over the last 3 days, to Fri 2 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.33in
Last 3 days
1.10in

Visibility

How far you can see at West Alton, the next 41 hours

Visibility stays 9 miles or more through Sat 7 PM, lowest 10 miles Sat 8 AM.

FriSat

On the radar over West Alton, MissouriReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest West Alton, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 4.6 miles away.

measured now4 instruments

St. CharlesSCLM7

At a river or reservoir gauge/14.0 mi away/443 ft/18 ft above here

temp, wind, gust, humidity, pressure

Rank651of 1,014

Elsberry PMCS2220

At a soil climate station/34.8 mi away/527 ft/102 ft above here

temp, humidity, soil temp, soil moisture

Rank688of 1,014

measured daily2 instruments

Florissant 2.5 NEMO-SL-55

In a volunteer observer's own ground/4.6 mi away/531 ft/106 ft above here

precip, snowfall, snow depth

Rank-

Saint CharlesSCHM7

At a cooperative observer's station/15.6 mi away/551 ft/126 ft above here

snowfall, snow depth, precip, high, low

Rank14of 1,014

Station report

The weather at St. Charles, drawn

The nearest airport reporting now, 11.1 mi from West Alton, Missouri. From its report of Oct 16, 2026, 2:54 AM local time: 3 of its 6 sheets.

The sky

A few clouds at 3,400 ft, overcast at 10,000 ft; the ceiling is 10,000 ft; visibility 10 mi or more.

Section of the sky over St. Charles, height above the station to scale: a few clouds cloud with its base at 3,400 feet, overcast cloud with its base at 10,000 feet, the ceiling at 10,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SETFIG. A THE SKY OVER ST. CHARLESSECTION, 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 STATION02,5005,0007,50010,00012,50015,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FTOVC 10,000 FTOVERCAST, 8 EIGHTHS OF THE SKYFEW 3,400 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYCEILING 10,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLESt. Charles, the skySTATION REPORT · ASOS SETTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-SET-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018, FB-SKY-013, FB-SKY-014

The air

56.0 F with a dew point of 49.0 F, 77 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,600 ft up; the lowest cloud reported is at 3,400 ft.

Chart of the air at St. Charles: temperature 56.0 degrees Fahrenheit and dew point 49.0, 77 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,600 feet above the station, against the lowest cloud reported at 3,400 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SETFIG. B THE AIR AT ST. CHARLESTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,00040 F50 F60 F70 FSATURATES 1,600 FT ABOVE THE STATION, AT 47.4 FLOWEST CLOUD REPORTED, FEW 3,400 FTTEMPERATURE 56.0 FDEW POINT 49.0 FSPREAD 7.0 FRELATIVE HUMIDITY 77 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 POINTTITLESt. Charles, the airSTATION REPORT · ASOS SETTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-SET-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west northwest (300 degrees) at 13 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 26 mph.

Plan of the wind at St. Charles, north up: blowing from 300 degrees, the west northwest, at 13 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SETFIG. C THE WIND AT ST. CHARLESPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 300°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 13 MPH5FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLESt. Charles, the windSTATION REPORT · ASOS SETTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-SET-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of St. Charles, in 6 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in Missouri

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

Near West Alton

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

Near West Alton

River and lake gauges