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Cape St. Claire, Maryland

Community in Anne Arundel County, Maryland

Air quality

The air at Cape St. Claire

Index 16, good, led by ozone. Read at 6 AM from its reporting area, Metro Baltimore (MD), 13 miles off.

16Good
  • Fine particles (PM2.5)3Good-
  • Ozone16Good14 ppb18.8 mi
  • Nitrogen dioxide5Good5.3 ppb18.8 mi
  • Sulfur dioxide0Good0.1 ppb18.8 mi
  • Carbon monoxide-0.3 ppm22.4 mi

The days ahead

Good each day through Sun Oct 18, led by fine particles. Yesterday measured 20, good.

Smoke, the next 44 hours

Little smoke near the ground through Sun 2 AM: the index from smoke stays at 6 or under.

FriSat

Precipitation

What has fallen at Cape St. Claire

0.08 in in the last 24 hours, and none in the 2 days before, to Fri 6 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.08in
Last 3 days
0.08in

Visibility

How far you can see at Cape St. Claire, the next 44 hours

Visibility stays 7 miles or more through Sun 2 AM, lowest 8 miles Fri 8 AM.

FriSat

On the radar over Cape St. Claire, MarylandReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 7 instruments nearest Cape St. Claire, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.5 miles away.

measured now5 instruments

AnnapolisNAK

At an airfield/4.2 mi away/4 ft/74 ft below here

temp, wind, gust, visibility, precip, pressure

Rank2of 736

AnnapolisNDBC-APAM2

At a river or reservoir gauge/4.5 mi away/-/- ft from here

temp, wind, gust, humidity, pressure

Rank662of 736

Powder MillS2049

At a soil climate station/21.6 mi away/105 ft/27 ft above here

temp, humidity, soil temp, soil moisture

Rank734of 736

measured daily2 instruments

Arnold 0.7 NNWMD-AA-58

In a volunteer observer's own ground/3.1 mi away/62 ft/16 ft below here

precip, snowfall, snow depth

Rank-

StevensvilleSTVM2

At a cooperative observer's station/7.7 mi away/-20 ft/98 ft below here

snowfall, snow depth, precip, high, low

Rank380of 736

Station report

The weather at Annapolis, drawn

The nearest airport reporting now, 4.2 mi from Cape St. Claire, Maryland. From its report of Oct 16, 2026, 6:32 AM local time: 3 of its 6 sheets.

The sky

Broken at 1,000 ft, overcast at 1,700 ft; the ceiling is 1,000 ft; visibility 10 mi or more.

Section of the sky over Annapolis, height above the station to scale: broken cloud with its base at 1,000 feet, overcast cloud with its base at 1,700 feet, the ceiling at 1,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT NAKFIG. A THE SKY OVER ANNAPOLISSECTION, 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 STATION05001,0001,5002,0002,5003,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 1,700 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 1,000 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 1,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEAnnapolis, the skySTATION REPORT · ASOS NAKTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-NAK-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

63.0 F with a dew point of 61.0 F, 93 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 500 ft up; the lowest cloud reported is at 1,000 ft.

Chart of the air at Annapolis: temperature 63.0 degrees Fahrenheit and dew point 61.0, 93 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 500 feet above the station, against the lowest cloud reported at 1,000 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT NAKFIG. B THE AIR AT ANNAPOLISTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00050 F60 F70 FSATURATES 500 FT ABOVE THE STATION, AT 60.5 FLOWEST CLOUD REPORTED, BKN 1,000 FTTEMPERATURE AND DEW POINT 63.0 F, 61.0 FRELATIVE HUMIDITY 93 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 POINTTITLEAnnapolis, the airSTATION REPORT · ASOS NAKTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-NAK-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south (170 degrees) at 5 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at Annapolis, north up: blowing from 170 degrees, the south, at 5 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 2, light breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT NAKFIG. C THE WIND AT ANNAPOLISPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 170°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 5 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEAnnapolis, the windSTATION REPORT · ASOS NAKTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-NAK-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

-

Snow on the ground

Elsewhere in Maryland

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

Near Cape St. Claire

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

Near Cape St. Claire

River and lake gauges