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Derby, Colorado

Community in Adams County, Colorado

Air quality

The air at Derby

Index 27, good, led by ozone. Read at 9 PM from its reporting area, Fort Collins (CO), 46 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 Derby

0.02 in in the last 24 hours, 0.47 in over the last 3 days, to Thu 9 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.02in
Last 3 days
0.47in

Visibility

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

Visibility stays 10 miles or more through Sat 6 PM.

FriSat

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

What is measuring near here

The 7 instruments nearest Derby, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.8 miles away.

measured now5 instruments

measured daily2 instruments

Commerce City 1.1 NNECO-AD-230

In a volunteer observer's own ground/0.8 mi away/5,171 ft/40 ft above here

precip, snowfall, snow depth

Rank-

NorthglennNRTC2

At a cooperative observer's station/6.6 mi away/5,377 ft/246 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, 11.7 mi from Derby, 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 Broomfield/Jeffco, 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 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 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 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

The air

44.6 F with a dew point of 32.0 F, 61 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,900 ft up.

Chart of the air at Broomfield/Jeffco: temperature 44.6 degrees Fahrenheit and dew point 32.0, 61 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; 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 STATION01,0002,0003,0004,00020 F30 F40 F50 F60 FSATURATES 2,900 FT ABOVE THE STATION, AT 29.3 FTEMPERATURE 44.6 FDEW POINT 32.0 FSPREAD 12.6 FRELATIVE HUMIDITY 61 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 north northeast (30 degrees) at 6 mph: force 2, a light breeze on the Beaufort scale. The strongest gust today was 37 mph.

Plan of the wind at Broomfield/Jeffco, north up: blowing from 30 degrees, the north northeast, 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 BJCFIG. C THE WIND AT BROOMFIELD/JEFFCOPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 30°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 6 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), 6.6 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 Derby

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

Near Derby

River and lake gauges