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Grand Lake, Colorado

Town in Grand County, Colorado

Air quality

The air at Grand Lake

Index 28, good, led by ozone. Read at 5 AM from its reporting area, Fort Collins (CO), 45 miles off.

28Good
  • Fine particles (PM2.5)13Good-
  • Ozone28Good-

The days ahead

Good each day through Today, led by fine particles. Yesterday measured 37, good.

Smoke, the next 43 hours

No smoke near the ground through Sun 12 AM.

FriSat

Precipitation

What has fallen at Grand Lake

0.01 in in the last 24 hours, 0.15 in over the last 3 days, to Fri 5 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.01in
Last 3 days
0.15in

Visibility

How far you can see at Grand Lake, the next 43 hours

Visibility stays 10 miles or more through Sun 12 AM.

FriSat

On the radar over Grand Lake, ColoradoReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 7 instruments nearest Grand Lake, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.6 miles away.

measured now5 instruments

Grand LakeGLKC2

At a river or reservoir gauge/1.0 mi away/8,765 ft/327 ft above here

temp, wind, gust, humidity, pressure

Rank677of 2,650

GranbyGNB

At an airfield/12.0 mi away/8,208 ft/230 ft below here

temp, wind, gust, visibility, precip, pressure

Rank1,767of 2,650

measured daily2 instruments

Grand Lake .36 ECO-GR-19

In a volunteer observer's own ground/0.6 mi away/8,425 ft/13 ft below here

precip, snowfall, snow depth

Rank-

Grand LakeGLKC2

At a cooperative observer's station/1.0 mi away/8,793 ft/355 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Granby, drawn

The nearest airport reporting now, 12.0 mi from Grand Lake, Colorado. From its report of Oct 16, 2026, 5:35 AM 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 Granby, 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 GNBFIG. A THE SKY OVER GRANBYSECTION, 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 MORE0510TITLEGranby, the skySTATION REPORT · ASOS GNBTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-GNB-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

20.0 F with a dew point of 17.4 F, 89 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 600 ft up.

Chart of the air at Granby: temperature 20.0 degrees Fahrenheit and dew point 17.4, 89 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 600 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT GNBFIG. B THE AIR AT GRANBYTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00010 F20 F30 FSATURATES 600 FT ABOVE THE STATION, AT 16.9 FTEMPERATURE AND DEW POINT 20.0 F, 17.4 FRELATIVE HUMIDITY 89 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 POINTTITLEGranby, the airSTATION REPORT · ASOS GNBTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-GNB-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 Granby, 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 GNBFIG. C THE WIND AT GRANBYPLAN, 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 FORCE73TITLEGranby, the windSTATION REPORT · ASOS GNBTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-GNB-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Granby, in 6 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in Colorado

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

Near Grand Lake

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

Near Grand Lake

River and lake gauges