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Jamestown, Colorado

Town in Boulder County, Colorado

Air quality

The air at Jamestown

Index 35, good, led by fine particles. Read at 10 AM from its reporting area, Denver-Boulder (CO), 23 miles off.

35Good
  • Fine particles (PM2.5)35Good9.4 mi
  • Ozone34Good29 ppb9.4 mi
  • Coarse particles (PM10)29Good9.4 mi

The days ahead

Good each day through Sat Oct 17, led by fine particles. Yesterday measured 36, good.

Smoke, the next 45 hours

No smoke near the ground through Sun 6 AM.

FriSatSun

Precipitation

What has fallen at Jamestown

None in the last 24 hours; 0.68 in over the last 3 days, to Fri 9 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.68in

Visibility

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

Visibility stays 10 miles or more through Sun 6 AM.

FriSatSun

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

What is measuring near here

The 7 instruments nearest Jamestown, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.4 miles away.

measured now5 instruments

Ward (35)CO044

Beside a road/6.0 mi away/9,155 ft/2,032 ft above here

temp, pavement temp, wind, visibility, precip

Rank2,575of 2,650

BoulderBDU

At an airfield/10.1 mi away/5,289 ft/1,834 ft below here

temp, wind, gust, visibility, precip, pressure

Rank1,442of 2,650

measured daily2 instruments

Lyons 7STHUC2

At a cooperative observer's station/5.4 mi away/5,735 ft/1,388 ft below here

snowfall, snow depth, precip, high, low

Rank1,873of 2,650

Station report

The weather at Boulder, drawn

The nearest airport reporting now, 10.1 mi from Jamestown, Colorado. From its report of Oct 16, 2026, 10:15 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 Boulder, 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 BDUFIG. A THE SKY OVER BOULDERSECTION, 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 MORE0510TITLEBoulder, the skySTATION REPORT · ASOS BDUTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-BDU-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

44.6 F with a dew point of 26.6 F, 49 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 4,100 ft up.

Chart of the air at Boulder: temperature 44.6 degrees Fahrenheit and dew point 26.6, 49 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 4,100 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BDUFIG. B THE AIR AT BOULDERTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,00010 F20 F30 F40 F50 F60 FSATURATES 4,100 FT ABOVE THE STATION, AT 22.9 FTEMPERATURE 44.6 FDEW POINT 26.6 FSPREAD 18.0 FRELATIVE HUMIDITY 49 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 POINTTITLEBoulder, the airSTATION REPORT · ASOS BDUTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-BDU-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.

Plan of the wind at Boulder, 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 BDUFIG. C THE WIND AT BOULDERPLAN, 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 FORCE73TITLEBoulder, the windSTATION REPORT · ASOS BDUTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-BDU-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Lyons 7S (THUC2), 5.4 miles from here, read 16 Oct, 07:00. measured daily

Elsewhere in Colorado

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

Near Jamestown

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

Near Jamestown

River and lake gauges