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Clarkson Valley, Missouri

City in St. Louis County, Missouri

Air quality

The air at Clarkson Valley

Index 19, good, led by ozone. Read at 6 AM from its reporting area, Saint Louis (MO), 6 miles off.

19Good
  • Fine particles (PM2.5)16Good15.7 mi
  • Ozone19Good15 ppb8.8 mi
  • Coarse particles (PM10)13Good15.7 mi
  • Nitrogen dioxide0Good0.9 ppb11.9 mi
  • Sulfur dioxide0Good0.3 ppb11.9 mi
  • Carbon monoxide-0.1 ppm16.7 mi

The days ahead

Yesterday measured 40, good.

Smoke, the next 44 hours

No smoke near the ground through Sun 1 AM.

FriSat

Precipitation

What has fallen at Clarkson Valley

0.57 in in the last 24 hours, 1.15 in over the last 3 days, to Fri 5 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.57in
Last 3 days
1.15in

Visibility

How far you can see at Clarkson Valley, the next 44 hours

Visibility stays 10 miles or more through Sun 1 AM.

FriSat

On the radar over Clarkson Valley, MissouriReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Clarkson Valley, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.1 miles away.

measured now4 instruments

St. CharlesSCLM7

At a river or reservoir gauge/13.3 mi away/443 ft/189 ft below here

temp, wind, gust, humidity, pressure

Rank651of 1,014

measured daily2 instruments

Ballwin 2.2 WNWMO-SS-71

In a volunteer observer's own ground/1.1 mi away/712 ft/80 ft above here

precip, snowfall, snow depth

Rank-

Missouri RiverSTCM7

At a cooperative observer's station/5.8 mi away/440 ft/192 ft below here

snowfall, snow depth, precip, high, low

Rank592of 1,014

Station report

The weather at St. Louis/Spirit, drawn

The nearest airport reporting now, 4.2 mi from Clarkson Valley, Missouri. From its report of Oct 16, 2026, 5:54 AM local time: 3 of its 6 sheets.

The sky

Scattered at 2,900 ft, broken at 12,000 ft; the ceiling is 12,000 ft; visibility 10 mi or more.

Section of the sky over St. Louis/Spirit, height above the station to scale: scattered cloud with its base at 2,900 feet, broken cloud with its base at 12,000 feet, the ceiling at 12,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SUSFIG. A THE SKY OVER ST. LOUIS/SPIRITSECTION, 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 STATION02,5005,0007,50010,00012,50015,00017,50020,000ETAGESLOWMIDDLEHIGHTHE STATIONTHE CEILOMETER READS TO 12,000 FTBKN 12,000 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYSCT 2,900 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYCEILING 12,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLESt. Louis/Spirit, the skySTATION REPORT · ASOS SUSTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-SUS-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

53.0 F with a dew point of 43.0 F, 69 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,300 ft up; the lowest cloud reported is at 2,900 ft.

Chart of the air at St. Louis/Spirit: temperature 53.0 degrees Fahrenheit and dew point 43.0, 69 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,300 feet above the station, against the lowest cloud reported at 2,900 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SUSFIG. B THE AIR AT ST. LOUIS/SPIRITTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,00030 F40 F50 F60 FSATURATES 2,300 FT ABOVE THE STATION, AT 40.8 FLOWEST CLOUD REPORTED, SCT 2,900 FTTEMPERATURE 53.0 FDEW POINT 43.0 FSPREAD 10.0 FRELATIVE HUMIDITY 69 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. Louis/Spirit, the airSTATION REPORT · ASOS SUSTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-SUS-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northwest (310 degrees) at 17 mph, gusting 26 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 26 mph.

Plan of the wind at St. Louis/Spirit, north up: blowing from 310 degrees, the northwest, at 17 miles an hour, gusting 26; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SUSFIG. C THE WIND AT ST. LOUIS/SPIRITPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 310°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 17 MPH5FRESH BREEZE196STRONG BREEZE25GUST, 26 MPH7NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLESt. Louis/Spirit, the windSTATION REPORT · ASOS SUSTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-SUS-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of St. Louis/Spirit, 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 Clarkson Valley

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

Near Clarkson Valley

River and lake gauges