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Rocky Hill, New Jersey

Borough in Somerset County, New Jersey

Air quality

The air at Rocky Hill

Index 51, moderate, led by fine particles. Read at 9 PM from its reporting area, Central (NJ), 17 miles off.

51Moderate
  • Fine particles (PM2.5)51Moderate9.7 mi
  • Ozone30Good24 ppb9.7 mi
  • Nitrogen dioxide4Good4 ppb11.9 mi

The days ahead

Highest 55, moderate, Mon Oct 19, led by ozone. Yesterday measured 26, good.

Smoke, the next 42 hours

No smoke near the ground through Sun 2 PM.

SatSun

Precipitation

What has fallen at Rocky Hill

0.06 in in the last 24 hours, 0.13 in over the last 3 days, to Fri 8 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.06in
Last 3 days
0.13in

Visibility

How far you can see at Rocky Hill, the next 42 hours

Visibility stays 6 miles or more through Sun 2 PM, lowest 6 miles Sat 3 AM.

SatSun

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

What is measuring near here

The 5 instruments nearest Rocky Hill, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.1 miles away.

measured now3 instruments

measured daily2 instruments

Station report

The weather at Trenton/Mercer Co., drawn

The nearest airport reporting now, 12.6 mi from Rocky Hill, New Jersey. From its report of Oct 16, 2026, 8:53 PM local time: 3 of its 6 sheets.

The sky

A few clouds at 7,500 ft, overcast at 10,000 ft; the ceiling is 10,000 ft; visibility 10 mi or more.

Section of the sky over Trenton/Mercer Co., height above the station to scale: a few clouds cloud with its base at 7,500 feet, overcast cloud with its base at 10,000 feet, the ceiling at 10,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT TTNFIG. A THE SKY OVER TRENTON/MERCER CO.SECTION, 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 STATION02,5005,0007,50010,00012,50015,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FTOVC 10,000 FTOVERCAST, 8 EIGHTHS OF THE SKYFEW 7,500 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYCEILING 10,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLETrenton/Mercer Co., the skySTATION REPORT · ASOS TTNTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-17IDSR-TTN-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-013, FB-SKY-014

The air

64.0 F with a dew point of 62.0 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 7,500 ft.

Chart of the air at Trenton/Mercer Co.: temperature 64.0 degrees Fahrenheit and dew point 62.0, 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 7,500 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT TTNFIG. B THE AIR AT TRENTON/MERCER CO.THE 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 FSATURATES 500 FT ABOVE THE STATION, AT 61.5 FABOVE THIS SHEET: LOWEST CLOUD REPORTED, FEW 7,500 FTTEMPERATURE AND DEW POINT 64.0 F, 62.0 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 POINTTITLETrenton/Mercer Co., the airSTATION REPORT · ASOS TTNTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-17IDSR-TTN-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the southwest (230 degrees) at 3 mph: force 1, a light air on the Beaufort scale. The strongest gust today was 30 mph.

Plan of the wind at Trenton/Mercer Co., north up: blowing from 230 degrees, the southwest, at 3 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 1, light air, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT TTNFIG. C THE WIND AT TRENTON/MERCER CO.PLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 230°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 3 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLETrenton/Mercer Co., the windSTATION REPORT · ASOS TTNTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-17IDSR-TTN-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Trenton/Mercer Co., in 6 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 Rocky Hill

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

Near Rocky Hill

River and lake gauges