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Randallstown, Maryland

Community in Baltimore County, Maryland

Air quality

The air at Randallstown

Index 23, good, led by ozone. Read at 12 AM from its reporting area, Metro Baltimore (MD), 17 miles off.

23Good
  • Fine particles (PM2.5)13Good10.6 mi
  • Ozone23Good22 ppb10.6 mi
  • Nitrogen dioxide14Good15.3 ppb2.9 mi
  • Sulfur dioxide0Good0.1 ppb18 mi
  • Carbon monoxide-0.1 ppm16.5 mi

The days ahead

Good each day through Wed Oct 21, led by fine particles. Yesterday measured 20, good.

Smoke, the next 45 hours

No smoke near the ground through Sun 8 PM.

SatSun

Precipitation

What has fallen at Randallstown

0.37 in in the last 24 hours, 0.49 in over the last 3 days, to Fri 11 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.37in
Last 3 days
0.49in

Visibility

How far you can see at Randallstown, the next 45 hours

Visibility stays 5 miles or more through Sun 8 PM, lowest 6 miles Sat 4 AM.

SatSun

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

What is measuring near here

The 7 instruments nearest Randallstown, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 4.0 miles away.

measured now5 instruments

BaltimoreNDBC-BLTM2

At a river or reservoir gauge/13.8 mi away/-/- ft from here

temp, wind, gust, humidity, pressure

Rank657of 742

Powder MillS2049

At a soil climate station/24.9 mi away/105 ft/441 ft below here

temp, humidity, soil temp, soil moisture

Rank726of 742

measured daily2 instruments

CylburCYLM2

At a cooperative observer's station/8.0 mi away/295 ft/251 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Baltimore Inner Harbor, drawn

The nearest airport reporting now, 12.0 mi from Randallstown, Maryland. From its report of Oct 16, 2026, 11:53 PM local time: 3 of its 4 sheets.

The air

63.0 F with a dew point of 59.0 F, 87 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 900 ft up.

Chart of the air at Baltimore Inner Harbor: temperature 63.0 degrees Fahrenheit and dew point 59.0, 87 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 900 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DMHFIG. B THE AIR AT BALTIMORE INNER HARBORTHE 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 900 FT ABOVE THE STATION, AT 58.1 FTEMPERATURE 63.0 FDEW POINT 59.0 FSPREAD 4.0 FRELATIVE HUMIDITY 87 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 POINTTITLEBaltimore Inner Harbor, the airSTATION REPORT · ASOS DMHTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 4DATE2026-10-17IDSR-DMH-1DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The column

At 20 ft above sea level, 0 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.90 inHg and the temperature at 58.9 F; the station's altimeter setting of 29.88 inHg means its barometer reads 29.86 inHg; it reports 63.0 F, 4.1 F warmer than standard.

Section from sea level of where Baltimore Inner Harbor stands in the atmosphere, height to scale: the station 20 feet above sea level with 0 per cent of the air below it; the standard atmosphere's pressure there, 29.90 inches of mercury, and temperature, 58.9 degrees Fahrenheit; the altimeter setting of 29.88 and the station pressure it means, 29.86.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DMHFIG. D WHERE BALTIMORE INNER HARBOR STANDS IN THE ATMOSPHERESECTION FROM SEA LEVEL, HEIGHT TO SCALE, THE STATION IN THE STANDARD ATMOSPHEREFT ABOVE SEA LEVEL05,00010,00015,000SEA LEVEL, 29.92 inHg IN THE STANDARD ATMOSPHEREBALTIMORE INNER HARBOR0 PER CENT OF THE AIR BELOW IT20 FT10 PER CENT OF THE AIR BELOW, 2,890 FT20 PER CENT OF THE AIR BELOW, 6,050 FT30 PER CENT OF THE AIR BELOW, 9,540 FT40 PER CENT OF THE AIR BELOW, 13,470 FTSTANDARD PRESSURE HERE29.90 inHgSTANDARD TEMPERATURE HERE58.9 FALTIMETER SETTING, REPORTED29.88 inHgITS BAROMETER READS29.86 inHgTEMPERATURE, REPORTED63.0 FTITLEBaltimore Inner Harbor, the columnSTATION REPORT · ASOS DMHTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 4DATE2026-10-17IDSR-DMH-2DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The sun

On Oct 17 the noon sun stands 41 degrees above the horizon at 39.28 N, and the day is 10 h 57 min long. Level ground there takes 66 per cent of the noon sunlight a surface facing the sun would.

Elevation of the noon sun at Baltimore Inner Harbor, angles true: on Oct 17 it stands 41 degrees above the horizon, against 74 at the June solstice, 51 at the equinoxes and 27 at the December solstice; the day is 10 h 57 min long.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DMHFIG. E THE SUN AT BALTIMORE INNER HARBORELEVATION LOOKING WEST, SOUTH TO THE LEFT: THE NOON SUN ON THE DAY OF THE REPORT, AND AT THE SOLSTICES AND EQUINOXES; ANGLES TRUETHE STATIONJUNE SOLSTICE 74°EQUINOXES 51°DECEMBER SOLSTICE 27°OCT 17, 41°SOUTHANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLYDAY LENGTH 10 H 57 MINLEVEL GROUND TAKES 66 PER CENT OF THE NOON SUN A FACING SURFACE WOULDLATITUDE 39.28 N; THE SUN'S DECLINATION -9.4°TITLEBaltimore Inner Harbor, the sunSTATION REPORT · ASOS DMHTYPEELEVATIONSCALEANGLES TRUEREVAS REPORTED SHEET 3 of 4DATE2026-10-17IDSR-DMH-3DRAWN AS linework on paperSOURCES FB-ENG-007

The full report of Baltimore Inner Harbor, in 4 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 Randallstown

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

Near Randallstown

River and lake gauges