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Martin's Additions, Maryland

Village in Montgomery County, Maryland

Air quality

The air at Martin's Additions

Index 34, good, led by fine particles. Read at 11 AM from its reporting area, Northern Virginia and DC (DC), 5 miles off.

34Good
  • Fine particles (PM2.5)34Good5 mi
  • Ozone18Good9 ppb2.9 mi
  • Nitrogen dioxide6Good6.6 ppb2.9 mi
  • Sulfur dioxide0Good0 ppb11.5 mi
  • Carbon monoxide-0.4 ppm5 mi

The days ahead

Good each day through Sun Oct 18, led by fine particles. Yesterday measured 23, good.

Smoke, the next 46 hours

Little smoke near the ground through Sun 8 AM: the index from smoke stays at 6 or under.

FriSatSun

Precipitation

What has fallen at Martin's Additions

0.04 in in the last 24 hours, and none in the 2 days before, to Fri 10 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.04in
Last 3 days
0.04in

Visibility

How far you can see at Martin's Additions, the next 46 hours

Fog: visibility falls to 0.9 miles Fri 7 PM, under a mile for 1 hour.

FriSatSun

On the radar over Martin's Additions, MarylandReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 7 instruments nearest Martin's Additions, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.0 miles away.

measured now5 instruments

College ParkCGS

At an airfield/7.9 mi away/48 ft/285 ft below here

temp, wind, gust, visibility, precip, pressure

Rank97of 736

Powder MillS2049

At a soil climate station/12.0 mi away/105 ft/228 ft below here

temp, humidity, soil temp, soil moisture

Rank734of 736

measured daily2 instruments

BeltsvilleBTVM2

At a cooperative observer's station/10.6 mi away/138 ft/195 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at College Park, drawn

The nearest airport reporting now, 7.9 mi from Martin's Additions, Maryland. From its report of Oct 16, 2026, 10:55 AM local time: 3 of its 6 sheets.

The sky

Overcast at 500 ft; the ceiling is 500 ft; visibility 10 mi or more.

Section of the sky over College Park, height above the station to scale: overcast cloud with its base at 500 feet, the ceiling at 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 STATION05001,0001,5002,0002,5003,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 500 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 500 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLECollege Park, the skySTATION REPORT · ASOS CGSTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-CGS-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

66.2 F with a dew point of 64.0 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 500 ft.

Chart of the air at College Park: temperature 66.2 degrees Fahrenheit and dew point 64.0, 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 500 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 STATION01,0002,0003,00050 F60 F70 F80 FSATURATES 500 FT ABOVE THE STATION, AT 63.4 FLOWEST CLOUD REPORTED, OVC 500 FTTEMPERATURE AND DEW POINT 66.2 F, 64.0 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 POINTTITLECollege Park, the airSTATION REPORT · ASOS CGSTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-CGS-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south (180 degrees) at 7 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at College Park, north up: blowing from 180 degrees, the south, at 7 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 180°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 7 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLECollege Park, the windSTATION REPORT · ASOS CGSTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-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 Martin's Additions

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

Near Martin's Additions

River and lake gauges