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Groton, Vermont

Community in Caledonia County, Vermont

Air quality

The air at Groton

Index 13, good, led by fine particles. Read at 2 AM from its reporting area, Grafton County (NH), 26 miles off.

13Good
  • Fine particles (PM2.5)13Good-
  • Ozone13Good-

The days ahead

Good each day through Today, led by fine particles. Yesterday measured 9, good.

Smoke, the next 43 hours

No smoke near the ground through Sat 8 PM.

FriSat

Precipitation

What has fallen at Groton

None in the last 24 hours; 1.80 in over the last 3 days, to Fri 1 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
1.80in

Visibility

How far you can see at Groton, the next 43 hours

Mist or haze: visibility falls to 1 mile Fri 12 PM.

FriSat

On the radar over Groton, VermontReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 7 instruments nearest Groton, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 4.3 miles away.

measured now5 instruments

St Johnsbury1V4

At an airfield/16.9 mi away/712 ft/96 ft below here

temp, wind, gust, visibility, precip, pressure

Rank4of 354

Mount MansfieldS2041

At a soil climate station/38.7 mi away/2,236 ft/1,428 ft above here

temp, humidity, soil temp, soil moisture

Rank282of 354

measured daily2 instruments

Groton 4.4 NWVT-CL-33

In a volunteer observer's own ground/4.3 mi away/1,208 ft/400 ft above here

precip, snowfall, snow depth

Rank-

PlainfieldPLFV1

At a cooperative observer's station/11.7 mi away/850 ft/42 ft above here

snowfall, snow depth, precip, high, low

Rank354of 354

Station report

The weather at St Johnsbury, drawn

The nearest airport reporting now, 16.9 mi from Groton, Vermont. From its report of Oct 16, 2026, 1:54 AM local time: 3 of its 4 sheets.

The air

35.0 F with a dew point of 33.0 F, 92 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 St Johnsbury: temperature 35.0 degrees Fahrenheit and dew point 33.0, 92 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 1V4FIG. B THE AIR AT ST JOHNSBURYTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00020 F30 F40 F50 FSATURATES 500 FT ABOVE THE STATION, AT 32.6 FTEMPERATURE AND DEW POINT 35.0 F, 33.0 FRELATIVE HUMIDITY 92 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 POINTTITLESt Johnsbury, the airSTATION REPORT · ASOS 1V4TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 4DATE2026-10-16IDSR-1V4-1DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The column

At 712 ft above sea level, 3 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.16 inHg and the temperature at 56.5 F; the station's altimeter setting of 30.06 inHg means its barometer reads 29.29 inHg; it reports 35.0 F, 21.5 F colder than standard.

Section from sea level of where St Johnsbury stands in the atmosphere, height to scale: the station 712 feet above sea level with 3 per cent of the air below it; the standard atmosphere's pressure there, 29.16 inches of mercury, and temperature, 56.5 degrees Fahrenheit; the altimeter setting of 30.06 and the station pressure it means, 29.29.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 1V4FIG. D WHERE ST JOHNSBURY 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 ATMOSPHEREST JOHNSBURY3 PER CENT OF THE AIR BELOW IT712 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 HERE29.16 inHgSTANDARD TEMPERATURE HERE56.5 FALTIMETER SETTING, REPORTED30.06 inHgITS BAROMETER READS29.29 inHgTEMPERATURE, REPORTED35.0 FTITLESt Johnsbury, the columnSTATION REPORT · ASOS 1V4TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 4DATE2026-10-16IDSR-1V4-2DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The sun

On Oct 16 the noon sun stands 37 degrees above the horizon at 44.42 N, and the day is 10 h 48 min long. Level ground there takes 60 per cent of the noon sunlight a surface facing the sun would.

Elevation of the noon sun at St Johnsbury, angles true: on Oct 16 it stands 37 degrees above the horizon, against 69 at the June solstice, 46 at the equinoxes and 22 at the December solstice; the day is 10 h 48 min long.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT 1V4FIG. E THE SUN AT ST JOHNSBURYELEVATION 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 69°EQUINOXES 46°DECEMBER SOLSTICE 22°OCT 16, 37°SOUTHANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLYDAY LENGTH 10 H 48 MINLEVEL GROUND TAKES 60 PER CENT OF THE NOON SUN A FACING SURFACE WOULDLATITUDE 44.42 N; THE SUN'S DECLINATION -9.1°TITLESt Johnsbury, the sunSTATION REPORT · ASOS 1V4TYPEELEVATIONSCALEANGLES TRUEREVAS REPORTED SHEET 3 of 4DATE2026-10-16IDSR-1V4-3DRAWN AS linework on paperSOURCES FB-ENG-007

The full report of St Johnsbury, in 4 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at Plainfield (PLFV1), 11.7 miles from here, read 15 Oct, 08:00. measured daily

Elsewhere in Vermont

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

Near Groton

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

Near Groton

River and lake gauges