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Cool Valley, Missouri

City in St. Louis County, Missouri

Air quality

The air at Cool Valley

Index 20, good, led by ozone. Read at 11 PM from its reporting area, St. Louis (Metro-east) (IL), 21 miles off.

20Good
  • Fine particles (PM2.5)14Good7 mi
  • Ozone20Good16 ppb7.9 mi
  • Coarse particles (PM10)6Good7.9 mi
  • Nitrogen dioxide3Good3.4 ppb7 mi
  • Sulfur dioxide0Good0.4 ppb7.6 mi
  • Carbon monoxide-0.1 ppm7 mi

The days ahead

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

Smoke, the next 44 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Cool Valley

0.52 in in the last 24 hours, 0.97 in over the last 3 days, to Thu 10 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.52in
Last 3 days
0.97in

Visibility

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

Visibility stays 9 miles or more through Sat 7 PM, lowest 10 miles Fri 12 AM.

FriSat

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

What is measuring near here

The 6 instruments nearest Cool Valley, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.7 miles away.

measured now4 instruments

St. LouisSTL

At an airfield/4.0 mi away/561 ft/42 ft above here

temp, wind, gust, visibility, precip, pressure

Rank810of 1,014

measured daily2 instruments

Normandy 0.6 SWMO-SL-120

In a volunteer observer's own ground/1.7 mi away/632 ft/113 ft above here

precip, snowfall, snow depth

Rank-

Station report

The weather at St. Louis, drawn

The nearest airport reporting now, 4.0 mi from Cool Valley, Missouri. From its report of Oct 15, 2026, 11:51 PM local time: 3 of its 6 sheets.

The sky

Broken at 4,700 ft, overcast at 6,000 ft; the ceiling is 4,700 ft; visibility 9 mi.

Section of the sky over St. Louis, height above the station to scale: broken cloud with its base at 4,700 feet, overcast cloud with its base at 6,000 feet, the ceiling at 4,700 feet, and visibility of 9 mi.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT STLFIG. A THE SKY OVER ST. LOUISSECTION, 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 STATION02,5005,0007,50010,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 6,000 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 4,700 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 4,700 FTVISIBILITY, MILES: 9 MI0510TITLESt. Louis, the skySTATION REPORT · ASOS STLTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-STL-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

57.0 F with a dew point of 54.0 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 4,700 ft.

Chart of the air at St. Louis: temperature 57.0 degrees Fahrenheit and dew point 54.0, 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 4,700 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT STLFIG. B THE AIR AT ST. LOUISTHE 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 700 FT ABOVE THE STATION, AT 53.3 FLOWEST CLOUD REPORTED, BKN 4,700 FTTEMPERATURE 57.0 FDEW POINT 54.0 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, the airSTATION REPORT · ASOS STLTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-STL-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northwest (310 degrees) at 20 mph, gusting 30 mph: force 5, a fresh breeze on the Beaufort scale. The strongest gust today was 43 mph.

Plan of the wind at St. Louis, north up: blowing from 310 degrees, the northwest, at 20 miles an hour, gusting 30; beside it the Beaufort scale from calm to hurricane force, force 5, fresh breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT STLFIG. C THE WIND AT ST. LOUISPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 310°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE19NOW, 20 MPH6STRONG BREEZE25GUST, 30 MPH7NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLESt. Louis, the windSTATION REPORT · ASOS STLTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-STL-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Science Center (SSCM7), 8.6 miles from here, read 14 Oct, 16:00. measured daily

Elsewhere in Missouri

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

Near Cool Valley

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

Near Cool Valley

River and lake gauges