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Hopatcong, New Jersey

Borough in Sussex County, New Jersey

Air quality

The air at Hopatcong

Index 21, good, led by fine particles. Read at 10 AM from its reporting area, North Central (NJ), 12 miles off.

21Good
  • Fine particles (PM2.5)21Good20.8 mi
  • Ozone19Good18 ppb10.5 mi
  • Nitrogen dioxide2Good2 ppb10.5 mi
  • Sulfur dioxide0Good0 ppb10.5 mi

The days ahead

Highest 55, moderate, Mon Oct 19, led by ozone. Yesterday measured 28, good.

Smoke, the next 40 hours

Little smoke near the ground through Sun 2 AM: the index from smoke stays at 6 or under.

FriSat

Precipitation

What has fallen at Hopatcong

0.15 in in the last 24 hours, 0.16 in over the last 3 days, to Fri 10 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.15in
Last 3 days
0.16in

Visibility

How far you can see at Hopatcong, the next 40 hours

Visibility stays 4 miles or more through Sun 2 AM, lowest 5 miles Fri 11 AM.

FriSat

On the radar over Hopatcong, New JerseyReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 5 instruments nearest Hopatcong, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.3 miles away.

measured now3 instruments

Citizen station EW4706EW4706

In a volunteer observer's own ground/1.4 mi away/980 ft/77 ft below here

temp, humidity, wind, precip, pressure

Rank-

measured daily2 instruments

Mount Arlington 0.4 NNWNJ-MS-130

In a volunteer observer's own ground/1.5 mi away/966 ft/91 ft below here

precip, snowfall, snow depth

Rank-

Rockaway 2NROCN4

At a cooperative observer's station/8.3 mi away/791 ft/266 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Andover/Aeroflex-Andover Airport, drawn

The nearest airport reporting now, 6.2 mi from Hopatcong, New Jersey. From its report of Oct 16, 2026, 10:54 AM local time: 3 of its 4 sheets.

The air

61.0 F with a dew point of 59.0 F, 93 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 500 ft up.

Chart of the air at Andover/Aeroflex-Andover Airport: temperature 61.0 degrees Fahrenheit and dew point 59.0, 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; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 12NFIG. B THE AIR AT ANDOVER/AEROFLEX-ANDOVER AIRPORTTHE 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 500 FT ABOVE THE STATION, AT 58.5 FTEMPERATURE AND DEW POINT 61.0 F, 59.0 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 POINTTITLEAndover/Aeroflex-Andover Airport, the airSTATION REPORT · ASOS 12NTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 4DATE2026-10-16IDSR-12N-1DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The column

At 584 ft above sea level, 2 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.30 inHg and the temperature at 56.9 F; the station's altimeter setting of 29.83 inHg means its barometer reads 29.21 inHg; it reports 61.0 F, 4.1 F warmer than standard.

Section from sea level of where Andover/Aeroflex-Andover Airport stands in the atmosphere, height to scale: the station 584 feet above sea level with 2 per cent of the air below it; the standard atmosphere's pressure there, 29.30 inches of mercury, and temperature, 56.9 degrees Fahrenheit; the altimeter setting of 29.83 and the station pressure it means, 29.21.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 12NFIG. D WHERE ANDOVER/AEROFLEX-ANDOVER AIRPORT 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 ATMOSPHEREANDOVER/AEROFLEX-ANDOVER AIRPORT2 PER CENT OF THE AIR BELOW IT584 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 HERE29.30 inHgSTANDARD TEMPERATURE HERE56.9 FALTIMETER SETTING, REPORTED29.83 inHgITS BAROMETER READS29.21 inHgTEMPERATURE, REPORTED61.0 FTITLEAndover/Aeroflex-Andover Airport, the columnSTATION REPORT · ASOS 12NTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 4DATE2026-10-16IDSR-12N-2DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The sun

On Oct 16 the noon sun stands 40 degrees above the horizon at 41.01 N, and the day is 10 h 56 min long. Level ground there takes 64 per cent of the noon sunlight a surface facing the sun would.

Elevation of the noon sun at Andover/Aeroflex-Andover Airport, angles true: on Oct 16 it stands 40 degrees above the horizon, against 72 at the June solstice, 49 at the equinoxes and 26 at the December solstice; the day is 10 h 56 min long.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 12NFIG. E THE SUN AT ANDOVER/AEROFLEX-ANDOVER AIRPORTELEVATION 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 72°EQUINOXES 49°DECEMBER SOLSTICE 26°OCT 16, 40°SOUTHANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLYDAY LENGTH 10 H 56 MINLEVEL GROUND TAKES 64 PER CENT OF THE NOON SUN A FACING SURFACE WOULDLATITUDE 41.01 N; THE SUN'S DECLINATION -9.1°TITLEAndover/Aeroflex-Andover Airport, the sunSTATION REPORT · ASOS 12NTYPEELEVATIONSCALEANGLES TRUEREVAS REPORTED SHEET 3 of 4DATE2026-10-16IDSR-12N-3DRAWN AS linework on paperSOURCES FB-ENG-007

The full report of Andover/Aeroflex-Andover Airport, in 4 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in New Jersey

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

Near Hopatcong

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

Near Hopatcong

River and lake gauges