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Welby, Colorado

Community in Adams County, Colorado

Air quality

The air at Welby

Index 39, good, led by fine particles. Read at 2 AM from its reporting area, Denver-Boulder (CO), 5 miles off.

39Good
  • Fine particles (PM2.5)39Good4.6 mi
  • Ozone29Good32 ppb1.3 mi
  • Coarse particles (PM10)10Good19.3 mi
  • Nitrogen dioxide2Good2.6 ppb1.3 mi
  • Sulfur dioxide0Good0.4 ppb6.9 mi
  • Carbon monoxide-0.1 ppm5.2 mi

The days ahead

Good each day through Today, led by fine particles. Yesterday measured 36, good.

Smoke, the next 41 hours

No smoke near the ground through Sat 6 PM.

FriSat

Precipitation

What has fallen at Welby

None in the last 24 hours; 0.63 in over the last 3 days, to Fri 1 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.63in

Visibility

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

Visibility stays 10 miles or more through Sat 6 PM.

FriSat

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

What is measuring near here

The 7 instruments nearest Welby, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.1 miles away.

measured now5 instruments

measured daily2 instruments

NorthglennNRTC2

At a cooperative observer's station/4.4 mi away/5,377 ft/170 ft above here

snowfall, snow depth, precip, high, low

Rank1,476of 2,650

Station report

The weather at Broomfield/Jeffco, drawn

The nearest airport reporting now, 9.1 mi from Welby, Colorado. From its report of Oct 16, 2026, 2:15 AM local time: 3 of its 6 sheets.

The sky

Overcast at 3,500 ft; the ceiling is 3,500 ft; visibility 10 mi or more.

Section of the sky over Broomfield/Jeffco, height above the station to scale: overcast cloud with its base at 3,500 feet, the ceiling at 3,500 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BJCFIG. A THE SKY OVER BROOMFIELD/JEFFCOSECTION, 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 STATION01,0002,0003,0004,0005,0006,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 3,500 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 3,500 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEBroomfield/Jeffco, the skySTATION REPORT · ASOS BJCTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-BJC-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

39.2 F with a dew point of 26.6 F, 60 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,900 ft up; the lowest cloud reported is at 3,500 ft.

Chart of the air at Broomfield/Jeffco: temperature 39.2 degrees Fahrenheit and dew point 26.6, 60 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,900 feet above the station, against the lowest cloud reported at 3,500 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BJCFIG. B THE AIR AT BROOMFIELD/JEFFCOTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,00010 F20 F30 F40 F50 FSATURATES 2,900 FT ABOVE THE STATION, AT 24.0 FLOWEST CLOUD REPORTED, OVC 3,500 FTTEMPERATURE 39.2 FDEW POINT 26.6 FSPREAD 12.6 FRELATIVE HUMIDITY 60 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 POINTTITLEBroomfield/Jeffco, the airSTATION REPORT · ASOS BJCTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-BJC-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northeast (40 degrees) at 7 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at Broomfield/Jeffco, north up: blowing from 40 degrees, the northeast, at 7 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 BJCFIG. C THE WIND AT BROOMFIELD/JEFFCOPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 40°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 7 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEBroomfield/Jeffco, the windSTATION REPORT · ASOS BJCTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-BJC-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Northglenn (NRTC2), 4.4 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 Welby

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

Near Welby

River and lake gauges