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Granby, Colorado

Town in Grand County, Colorado

Air quality

The air at Granby

Index 27, good, led by ozone. Read at 9 PM from its reporting area, Fort Collins (CO), 55 miles off.

27Good
  • Ozone27Good-

The days ahead

Good each day through Fri Oct 16, led by fine particles. Yesterday measured 37, good.

Smoke, the next 45 hours

No smoke near the ground through Sat 6 PM.

FriSat

Precipitation

What has fallen at Granby

None in the last 24 hours; 0.05 in over the last 3 days, to Thu 9 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.05in

Visibility

How far you can see at Granby, the next 45 hours

Visibility stays 10 miles or more through Sat 6 PM.

FriSat

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

What is measuring near here

The 7 instruments nearest Granby, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.3 miles away.

measured now5 instruments

GranbyGNB

At an airfield/1.3 mi away/8,208 ft/159 ft above here

temp, wind, gust, visibility, precip, pressure

Rank1,767of 2,650

measured daily2 instruments

Granby 0.4 SECO-GR-58

In a volunteer observer's own ground/0.3 mi away/8,018 ft/31 ft below here

precip, snowfall, snow depth

Rank-

Grand Lake 6SSWGDLC2

At a cooperative observer's station/7.6 mi away/8,287 ft/238 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Granby, drawn

The nearest airport reporting now, 1.3 mi from Granby, Colorado. From its report of Oct 15, 2026, 9:55 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 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

31.5 F with a dew point of 23.0 F, 70 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,900 ft up.

Chart of the air at Granby: temperature 31.5 degrees Fahrenheit and dew point 23.0, 70 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,900 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 F40 FSATURATES 1,900 FT ABOVE THE STATION, AT 21.2 FTEMPERATURE 31.5 FDEW POINT 23.0 FSPREAD 8.5 FRELATIVE HUMIDITY 70 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-002, FB-ENG-011, FB-ENG-005

The wind

From the east (100 degrees) at 3 mph: force 1, a light air on the Beaufort scale. The strongest gust today was 24 mph.

Plan of the wind at Granby, north up: blowing from 100 degrees, the east, 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 GNBFIG. C THE WIND AT GRANBYPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 100°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 3 MPH2LIGHT 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 Granby

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

Near Granby

River and lake gauges