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Colchester, Connecticut

Community in New London County, Connecticut

Air quality

The air at Colchester

Index 27, good, led by fine particles. Read at 12 AM from its reporting area, Hartford (CT), 21 miles off.

27Good
  • Fine particles (PM2.5)27Good20.3 mi
  • Ozone6Good5 ppb21 mi
  • Coarse particles (PM10)8Good20.3 mi
  • Nitrogen dioxide15Good16 ppb21 mi
  • Carbon monoxide-0.3 ppm22.4 mi

The days ahead

Good each day through Today, led by fine particles. Yesterday measured 48, good.

Smoke, the next 44 hours

No smoke near the ground through Sat 8 PM.

FriSat

Precipitation

What has fallen at Colchester

None in the last 3 days, to Fri 12 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.00in

Visibility

How far you can see at Colchester, the next 44 hours

Mist or haze: visibility falls to 1 miles Fri 7 PM.

FriSat

On the radar over Colchester, ConnecticutReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Colchester, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.4 miles away.

measured now4 instruments

measured daily2 instruments

NorwichNRWC3

At a cooperative observer's station/14.1 mi away/33 ft/425 ft below here

snowfall, snow depth, precip, high, low

Rank29of 375

Station report

The weather at Willimantic (ASOS), drawn

The nearest airport reporting now, 13.7 mi from Colchester, Connecticut. From its report of Oct 15, 2026, 11:52 PM local time: 3 of its 6 sheets.

The sky

No cloud below 12,000 ft; visibility 10 mi or more.

Section of the sky over Willimantic (ASOS), height above the station to scale: no cloud detected below 12,000 feet, the reach of its ceilometer, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT IJDFIG. A THE SKY OVER WILLIMANTIC (ASOS)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 STATION05001,0001,5002,0002,5003,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETNO CLOUD DETECTED BELOW 12,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEWillimantic (ASOS), the skySTATION REPORT · ASOS IJDTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-IJD-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

45.0 F with a dew point of 43.0 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 Willimantic (ASOS): temperature 45.0 degrees Fahrenheit and dew point 43.0, 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 IJDFIG. B THE AIR AT WILLIMANTIC (ASOS)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 STATION01,0002,0003,00030 F40 F50 F60 FSATURATES 500 FT ABOVE THE STATION, AT 42.5 FTEMPERATURE AND DEW POINT 45.0 F, 43.0 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 POINTTITLEWillimantic (ASOS), the airSTATION REPORT · ASOS IJDTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-IJD-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Willimantic (ASOS), north up: calm; beside it the Beaufort scale from calm to hurricane force, force 0, calm, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT IJDFIG. C THE WIND AT WILLIMANTIC (ASOS)PLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONCALMBEAUFORT FORCELEAST WIND, MPH0CALM0NOW, 0 MPH1LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEWillimantic (ASOS), the windSTATION REPORT · ASOS IJDTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-IJD-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Willimantic (ASOS), in 6 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at Norwich (NRWC3), 14.1 miles from here, read 15 Oct, 08:00. measured daily

Elsewhere in Connecticut

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

Near Colchester

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

Near Colchester

River and lake gauges