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Four Corners, Maryland

Community in Montgomery County, Maryland

Air quality

The air at Four Corners

Index 38, good, led by fine particles. Read at 8 PM from its reporting area, Suburban DC (MD), 2 miles off.

38Good
  • Fine particles (PM2.5)38Good7.3 mi
  • Ozone30Good20 ppb7.3 mi
  • Nitrogen dioxide3Good3.4 ppb7.3 mi
  • Sulfur dioxide0Good0.1 ppb7.3 mi
  • Carbon monoxide-0.1 ppm7.3 mi

The days ahead

Good each day through Wed Oct 21, led by fine particles. Yesterday measured 21, good.

Smoke, the next 42 hours

No smoke near the ground through Sun 2 PM.

SatSun

Precipitation

What has fallen at Four Corners

0.07 in in the last 24 hours, and none in the 2 days before, to Fri 8 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.07in
Last 3 days
0.07in

Visibility

How far you can see at Four Corners, the next 42 hours

Visibility stays 3 miles or more through Sun 2 PM, lowest 3 miles Sat 4 AM.

SatSun

On the radar over Four Corners, MarylandReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 7 instruments nearest Four Corners, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.4 miles away.

measured now5 instruments

College ParkCGS

At an airfield/5.7 mi away/48 ft/253 ft below here

temp, wind, gust, visibility, precip, pressure

Rank74of 742

Powder MillS2049

At a soil climate station/8.7 mi away/105 ft/196 ft below here

temp, humidity, soil temp, soil moisture

Rank726of 742

measured daily2 instruments

Silver Spring 1.2 NNEMD-MG-163

In a volunteer observer's own ground/0.4 mi away/333 ft/32 ft above here

precip, snowfall, snow depth

Rank-

BeltsvilleBTVM2

At a cooperative observer's station/6.9 mi away/138 ft/163 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at College Park, drawn

The nearest airport reporting now, 5.7 mi from Four Corners, Maryland. From its report of Oct 16, 2026, 8:55 PM local time: 3 of its 6 sheets.

The sky

Scattered at 4,800 ft, broken at 6,500 ft, overcast at 11,000 ft; the ceiling is 6,500 ft; visibility 10 mi or more.

Section of the sky over College Park, height above the station to scale: scattered cloud with its base at 4,800 feet, broken cloud with its base at 6,500 feet, overcast cloud with its base at 11,000 feet, the ceiling at 6,500 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CGSFIG. A THE SKY OVER COLLEGE PARKSECTION, 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 STATION02,5005,0007,50010,00012,50015,00017,500ETAGESLOWMIDDLEHIGHTHE STATIONTHE CEILOMETER READS TO 12,000 FTOVC 11,000 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 6,500 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYSCT 4,800 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYCEILING 6,500 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLECollege Park, the skySTATION REPORT · ASOS CGSTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-17IDSR-CGS-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

63.7 F with a dew point of 59.4 F, 86 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,000 ft up; the lowest cloud reported is at 4,800 ft.

Chart of the air at College Park: temperature 63.7 degrees Fahrenheit and dew point 59.4, 86 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,000 feet above the station, against the lowest cloud reported at 4,800 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CGSFIG. B THE AIR AT COLLEGE PARKTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,00050 F60 F70 FSATURATES 1,000 FT ABOVE THE STATION, AT 58.4 FLOWEST CLOUD REPORTED, SCT 4,800 FTTEMPERATURE 63.7 FDEW POINT 59.4 FSPREAD 4.3 FRELATIVE HUMIDITY 86 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 POINTTITLECollege Park, the airSTATION REPORT · ASOS CGSTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-17IDSR-CGS-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north (350 degrees) at 6 mph: force 2, a light breeze on the Beaufort scale. The strongest gust today was 25 mph.

Plan of the wind at College Park, north up: blowing from 350 degrees, the north, at 6 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 CGSFIG. C THE WIND AT COLLEGE PARKPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 350°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 6 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLECollege Park, the windSTATION REPORT · ASOS CGSTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-17IDSR-CGS-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

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Snow on the ground

Elsewhere in Maryland

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

Near Four Corners

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

Near Four Corners

River and lake gauges