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Keystone, Colorado

Community in Summit County, Colorado

Air quality

The air at Keystone

Index 38, good, led by ozone. Read at 8 PM from its reporting area, Denver-Boulder (CO), 52 miles off.

38Good
  • Ozone38Good-

The days ahead

Good each day through Fri Oct 16, led by fine particles. Yesterday measured 43, good.

Smoke, the next 41 hours

No smoke near the ground through Sat 12 PM.

ThuFriSat

Precipitation

What has fallen at Keystone

None in the last 24 hours; 0.46 in over the last 3 days, to Thu 7 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.46in

Visibility

How far you can see at Keystone, the next 41 hours

Visibility stays 10 miles or more through Sat 12 PM.

ThuFriSat

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

What is measuring near here

The 7 instruments nearest Keystone, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 3.6 miles away.

measured now5 instruments

DillonDLLC2

At a river or reservoir gauge/4.2 mi away/9,110 ft/1,753 ft below here

temp, wind, gust, humidity, pressure

Rank2,616of 2,650

measured daily2 instruments

Dillon 2.7 SECO-SU-63

In a volunteer observer's own ground/3.6 mi away/9,118 ft/1,745 ft below here

precip, snowfall, snow depth

Rank-

DillonDLLC2

At a cooperative observer's station/4.2 mi away/9,222 ft/1,641 ft below here

snowfall, snow depth, precip, high, low

Rank1,495of 2,650

Station report

The weather at Red Cliff Pass (CDOT), drawn

The nearest airport reporting now, 15.1 mi from Keystone, Colorado. From its report of Oct 15, 2026, 8:15 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 Red Cliff Pass (CDOT), 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 CCUFIG. A THE SKY OVER RED CLIFF PASS (CDOT)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 MORE0510TITLERed Cliff Pass (CDOT), the skySTATION REPORT · ASOS CCUTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-CCU-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

23.0 F with a dew point of 19.4 F, 86 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 800 ft up.

Chart of the air at Red Cliff Pass (CDOT): temperature 23.0 degrees Fahrenheit and dew point 19.4, 86 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 800 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CCUFIG. B THE AIR AT RED CLIFF PASS (CDOT)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 STATION01,0002,0003,00010 F20 F30 FSATURATES 800 FT ABOVE THE STATION, AT 18.6 FTEMPERATURE 23.0 FDEW POINT 19.4 FSPREAD 3.6 FRELATIVE HUMIDITY 86 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 POINTTITLERed Cliff Pass (CDOT), the airSTATION REPORT · ASOS CCUTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-CCU-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northwest (310 degrees) at 6 mph: force 2, a light breeze on the Beaufort scale. The strongest gust today was 29 mph.

Plan of the wind at Red Cliff Pass (CDOT), north up: blowing from 310 degrees, the northwest, at 6 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 2, light breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CCUFIG. C THE WIND AT RED CLIFF PASS (CDOT)PLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 310°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 6 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLERed Cliff Pass (CDOT), the windSTATION REPORT · ASOS CCUTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-CCU-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Red Cliff Pass (CDOT), in 6 sheets, each beside the Field Book plates that explain it

1in

Snow on the ground

Measured at Dillon (DLLC2), 4.2 miles from here, read 15 Oct, 07:00. measured daily

Elsewhere in Colorado

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

Near Keystone

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

Near Keystone

River and lake gauges