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Florissant, Missouri

City in St. Louis County, Missouri

Air quality

The air at Florissant

Index 19, good, led by ozone. Read at 5 AM from its reporting area, Saint Louis (MO), 24 miles off.

19Good
  • Fine particles (PM2.5)17Good11.9 mi
  • Ozone19Good18 ppb7.1 mi
  • Coarse particles (PM10)9Good11.9 mi
  • Nitrogen dioxide2Good2.7 ppb7.1 mi
  • Sulfur dioxide0Good0.3 ppb7.7 mi
  • Carbon monoxide-0.1 ppm11.9 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 Florissant

0.42 in in the last 24 hours, 1.10 in over the last 3 days, to Fri 5 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.42in
Last 3 days
1.10in

Visibility

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

Visibility stays 10 miles or more through Sun 1 AM.

FriSat

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

What is measuring near here

The 6 instruments nearest Florissant, 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/4.3 mi away/561 ft/34 ft above here

temp, wind, gust, visibility, precip, pressure

Rank810of 1,014

St. CharlesSCLM7

At a river or reservoir gauge/8.1 mi away/443 ft/84 ft below here

temp, wind, gust, humidity, pressure

Rank651of 1,014

measured daily2 instruments

Florissant 1.6 WNWMO-SL-73

In a volunteer observer's own ground/1.7 mi away/567 ft/40 ft above here

precip, snowfall, snow depth

Rank-

Saint CharlesSCHM7

At a cooperative observer's station/9.7 mi away/551 ft/24 ft above here

snowfall, snow depth, precip, high, low

Rank14of 1,014

Station report

The weather at St. Louis, drawn

The nearest airport reporting now, 4.3 mi from Florissant, Missouri. From its report of Oct 16, 2026, 5:51 AM local time: 3 of its 6 sheets.

The sky

Broken at 2,500 ft, overcast at 12,000 ft; the ceiling is 2,500 ft; visibility 10 mi or more.

Section of the sky over St. Louis, height above the station to scale: broken cloud with its base at 2,500 feet, overcast cloud with its base at 12,000 feet, the ceiling at 2,500 feet, and visibility of 10 mi or more.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 STATION02,5005,0007,50010,00012,50015,00017,50020,000ETAGESLOWMIDDLEHIGHTHE STATIONTHE CEILOMETER READS TO 12,000 FTOVC 12,000 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 2,500 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 2,500 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLESt. 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, FB-SKY-013, FB-SKY-014

The air

54.0 F with a dew point of 46.0 F, 74 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,800 ft up; the lowest cloud reported is at 2,500 ft.

Chart of the air at St. Louis: temperature 54.0 degrees Fahrenheit and dew point 46.0, 74 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,800 feet above the station, against the lowest cloud reported at 2,500 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 STATION01,0002,0003,0004,00030 F40 F50 F60 FSATURATES 1,800 FT ABOVE THE STATION, AT 44.2 FLOWEST CLOUD REPORTED, BKN 2,500 FTTEMPERATURE 54.0 FDEW POINT 46.0 FSPREAD 8.0 FRELATIVE HUMIDITY 74 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-002, FB-ENG-011, FB-ENG-005

The wind

From the northwest (320 degrees) at 18 mph, gusting 32 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 35 mph.

Plan of the wind at St. Louis, north up: blowing from 320 degrees, the northwest, at 18 miles an hour, gusting 32; beside it the Beaufort scale from calm to hurricane force, force 4, moderate 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 320°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 18 MPH5FRESH BREEZE196STRONG BREEZE257NEAR GALE32GUST, 32 MPH8GALE399STRONG 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

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Snow on the ground

Elsewhere in Missouri

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

Near Florissant

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

Near Florissant

River and lake gauges