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Arnold, Missouri

City in Jefferson County, Missouri

Air quality

The air at Arnold

Index 19, good, led by ozone. Read at 12 AM from its reporting area, Saint Louis (MO), 23 miles off.

19Good
  • Fine particles (PM2.5)14Good17.3 mi
  • Ozone19Good8 ppb1.6 mi
  • Coarse particles (PM10)7Good18.5 mi
  • Nitrogen dioxide2Good2 ppb1.6 mi
  • Sulfur dioxide1Good1.6 ppb11.5 mi
  • Carbon monoxide-0.1 ppm14.9 mi

The days ahead

Yesterday measured 44, good.

Smoke, the next 43 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Arnold

0.44 in in the last 24 hours, 0.89 in over the last 3 days, to Thu 11 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.44in
Last 3 days
0.89in

Visibility

How far you can see at Arnold, the next 43 hours

Visibility stays 9 miles or more through Sat 7 PM, lowest 9 miles Fri 3 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Arnold, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.6 miles away.

measured now4 instruments

measured daily2 instruments

Arnold 0.3 EMO-JF-36

In a volunteer observer's own ground/0.6 mi away/516 ft/16 ft below here

precip, snowfall, snow depth

Rank147of 1,014

Imperial 3NWIMPM7

At a cooperative observer's station/4.2 mi away/509 ft/23 ft below here

snowfall, snow depth, precip, high, low

Rank807of 1,014

Station report

The weather at St. Louis/Spirit, drawn

The nearest airport reporting now, 21.8 mi from Arnold, Missouri. From its report of Oct 16, 2026, 12:39 AM local time: 3 of its 6 sheets.

The sky

A few clouds at 1,800 ft, broken at 4,500 ft, overcast at 8,000 ft; the ceiling is 4,500 ft; visibility 8 mi.

Section of the sky over St. Louis/Spirit, height above the station to scale: a few clouds cloud with its base at 1,800 feet, broken cloud with its base at 4,500 feet, overcast cloud with its base at 8,000 feet, the ceiling at 4,500 feet, and visibility of 8 mi.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 STATION02,5005,0007,50010,00012,500ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FTOVC 8,000 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 4,500 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYFEW 1,800 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYCEILING 4,500 FTVISIBILITY, MILES: 8 MI0510TITLESt. 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

56.0 F with a dew point of 53.0 F, 90 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 700 ft up; the lowest cloud reported is at 1,800 ft.

Chart of the air at St. Louis/Spirit: temperature 56.0 degrees Fahrenheit and dew point 53.0, 90 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 700 feet above the station, against the lowest cloud reported at 1,800 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 STATION01,0002,0003,00040 F50 F60 F70 FSATURATES 700 FT ABOVE THE STATION, AT 52.3 FLOWEST CLOUD REPORTED, FEW 1,800 FTTEMPERATURE 56.0 FDEW POINT 53.0 FSPREAD 3.0 FRELATIVE HUMIDITY 90 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-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west northwest (300 degrees) at 12 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 23 mph.

Plan of the wind at St. Louis/Spirit, north up: blowing from 300 degrees, the west northwest, at 12 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 3, gentle 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 300°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 12 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR 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 Arnold

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

Near Arnold

River and lake gauges