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Darnestown, Maryland

Community in Montgomery County, Maryland

Air quality

The air at Darnestown

Index 17, good, led by ozone. Read at 12 AM from its reporting area, Suburban DC (MD), 17 miles off.

17Good
  • Fine particles (PM2.5)6Good9.3 mi
  • Ozone17Good10 ppb9.3 mi
  • Nitrogen dioxide4Good4.2 ppb19.3 mi
  • Sulfur dioxide0Good0 ppb21.9 mi
  • Carbon monoxide-0.3 ppm19.3 mi

The days ahead

Good each day through Sun Oct 18, led by fine particles. Yesterday measured 48, good.

Smoke, the next 44 hours

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

FriSat

Precipitation

What has fallen at Darnestown

0.06 in in the last 24 hours, and none in the 2 days before, to Thu 11 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.06in
Last 3 days
0.06in

Visibility

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

Visibility stays 7 miles or more through Sat 8 PM, lowest 8 miles Fri 5 AM.

FriSat

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

What is measuring near here

The 7 instruments nearest Darnestown, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.9 miles away.

measured now5 instruments

GaithersburgGAI

At an airfield/7.3 mi away/539 ft/126 ft above here

temp, wind, gust, visibility, precip, pressure

Rank76of 736

Powder MillS2049

At a soil climate station/23.8 mi away/105 ft/308 ft below here

temp, humidity, soil temp, soil moisture

Rank734of 736

measured daily2 instruments

Germantown 3.2 SSWMD-MG-88

In a volunteer observer's own ground/1.9 mi away/352 ft/61 ft below here

precip, snowfall, snow depth

Rank-

Damascus 3 SSWDMAM2

At a cooperative observer's station/11.1 mi away/676 ft/263 ft above here

snowfall, snow depth, precip, high, low

Rank31of 736

Station report

The weather at Gaithersburg, drawn

The nearest airport reporting now, 7.3 mi from Darnestown, Maryland. From its report of Oct 16, 2026, 12:56 AM local time: 3 of its 6 sheets.

The sky

Overcast at 400 ft; the ceiling is 400 ft; visibility 5 mi.

Section of the sky over Gaithersburg, height above the station to scale: overcast cloud with its base at 400 feet, the ceiling at 400 feet, and visibility of 5 mi.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT GAIFIG. A THE SKY OVER GAITHERSBURGSECTION, 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 400 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 400 FTVISIBILITY, MILES: 5 MI0510TITLEGaithersburg, the skySTATION REPORT · ASOS GAITYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-GAI-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

59.0 F with a dew point of 59.0 F, 100 per cent relative humidity. The air is saturated at the ground; the lowest cloud reported is at 400 ft.

Chart of the air at Gaithersburg: temperature 59.0 degrees Fahrenheit and dew point 59.0, 100 per cent relative humidity; the air saturated at the ground, against the lowest cloud reported at 400 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT GAIFIG. B THE AIR AT GAITHERSBURGTHE 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 FSATURATED AT THE GROUNDLOWEST CLOUD REPORTED, OVC 400 FTTEMPERATURE AND DEW POINT 59.0 F, 59.0 FRELATIVE HUMIDITY 100 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 POINTTITLEGaithersburg, the airSTATION REPORT · ASOS GAITYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-GAI-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south southeast (150 degrees) at 6 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at Gaithersburg, north up: blowing from 150 degrees, the south southeast, 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 GAIFIG. C THE WIND AT GAITHERSBURGPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 150°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 6 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEGaithersburg, the windSTATION REPORT · ASOS GAITYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-GAI-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Gaithersburg, 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 Darnestown

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

Near Darnestown

River and lake gauges