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Difficult Run, Virginia

Community in Fairfax County, Virginia

Air quality

The air at Difficult Run

Index 50, good, led by fine particles. Read at 2 PM from its reporting area, Northern Virginia (VA), 6 miles off.

50Good
  • Fine particles (PM2.5)50Good18.2 mi
  • Ozone18Good29 ppb18.2 mi
  • Coarse particles (PM10)13Good-
  • Nitrogen dioxide2Good2.8 ppb18.2 mi
  • Carbon monoxide-0.4 ppm18.2 mi

The days ahead

Good each day through Wed Oct 21, led by fine particles. Yesterday measured 28, good.

Smoke, the next 43 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 Difficult Run

0.16 in in the last 24 hours, and none in the 2 days before, to Fri 1 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.16in
Last 3 days
0.16in

Visibility

How far you can see at Difficult Run, the next 43 hours

Visibility stays 6 miles or more through Sun 8 AM, lowest 7 miles Sat 4 AM.

FriSatSun

What is measuring near here

The 5 instruments nearest Difficult Run, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.4 miles away.

measured now3 instruments

measured daily2 instruments

Oakton 2.0 SWVA-FX-95

In a volunteer observer's own ground/1.8 mi away/383 ft/12 ft below here

precip, snowfall, snow depth

Rank-

Dunn LoringDNLV2

At a cooperative observer's station/7.4 mi away/489 ft/94 ft above here

snowfall, snow depth, precip, high, low

Rank1,540of 1,541

Station report

The weather at Washington/Dulles, drawn

The nearest airport reporting now, 5.7 mi from Difficult Run, Virginia. From its report of Oct 16, 2026, 1:52 PM local time: 3 of its 6 sheets.

The sky

A few clouds at 2,000 ft, a few clouds at 3,100 ft; visibility 10 mi or more.

Section of the sky over Washington/Dulles, height above the station to scale: a few clouds cloud with its base at 2,000 feet, a few clouds cloud with its base at 3,100 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT IADFIG. A THE SKY OVER WASHINGTON/DULLESSECTION, 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 STATION01,0002,0003,0004,0005,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETFEW 3,100 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYFEW 2,000 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYVISIBILITY, MILES: 10 MI OR MORE0510TITLEWashington/Dulles, the skySTATION REPORT · ASOS IADTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-IAD-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

79.0 F with a dew point of 68.0 F, 69 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,600 ft up; the lowest cloud reported is at 2,000 ft.

Chart of the air at Washington/Dulles: temperature 79.0 degrees Fahrenheit and dew point 68.0, 69 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,600 feet above the station, against the lowest cloud reported at 2,000 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT IADFIG. B THE AIR AT WASHINGTON/DULLESTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,00050 F60 F70 F80 F90 FSATURATES 2,600 FT ABOVE THE STATION, AT 65.4 FLOWEST CLOUD REPORTED, FEW 2,000 FTTEMPERATURE 79.0 FDEW POINT 68.0 FSPREAD 11.0 FRELATIVE HUMIDITY 69 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 POINTTITLEWashington/Dulles, the airSTATION REPORT · ASOS IADTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-IAD-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south southwest (200 degrees) at 9 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 21 mph.

Plan of the wind at Washington/Dulles, north up: blowing from 200 degrees, the south southwest, at 9 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT IADFIG. C THE WIND AT WASHINGTON/DULLESPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 200°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 9 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEWashington/Dulles, the windSTATION REPORT · ASOS IADTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-IAD-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Dunn Loring (DNLV2), 7.4 miles from here, read 16 Oct, 08:00. measured daily

Elsewhere in Virginia

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

Near Difficult Run

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

Near Difficult Run