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Louisville, Colorado

City in Boulder County, Colorado

Air quality

The air at Louisville

Index 26, good, led by ozone. Read at 6 AM from its reporting area, Denver-Boulder (CO), 8 miles off.

26Good
  • Fine particles (PM2.5)14Good7.1 mi
  • Ozone26Good28 ppb7.5 mi
  • Coarse particles (PM10)9Good7.1 mi
  • Nitrogen dioxide8Good8.8 ppb14 mi
  • Sulfur dioxide0Good0 ppb14 mi
  • Carbon monoxide-0.2 ppm15.6 mi

The days ahead

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

Smoke, the next 42 hours

No smoke near the ground through Sun 12 AM.

FriSat

Precipitation

What has fallen at Louisville

0.03 in in the last 24 hours, 0.87 in over the last 3 days, to Fri 5 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.03in
Last 3 days
0.87in

Visibility

How far you can see at Louisville, the next 42 hours

Visibility stays 10 miles or more through Sun 12 AM.

FriSat

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

What is measuring near here

The 7 instruments nearest Louisville, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.2 miles away.

measured now5 instruments

measured daily2 instruments

Louisville 0.8 NNWCO-BO-619

In a volunteer observer's own ground/0.2 mi away/5,469 ft/24 ft above here

precip, snowfall, snow depth

Rank-

Lafayette 1NLAFC2

At a cooperative observer's station/3.8 mi away/5,279 ft/166 ft below here

snowfall, snow depth, precip, high, low

Rank1,550of 2,650

Station report

The weather at Broomfield/Jeffco, drawn

The nearest airport reporting now, 5.1 mi from Louisville, Colorado. From its report of Oct 16, 2026, 6:48 AM local time: 3 of its 6 sheets.

The sky

Scattered at 15,000 ft; visibility 10 mi or more.

Section of the sky over Broomfield/Jeffco, height above the station to scale: scattered cloud with its base at 15,000 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 STATION05,00010,00015,00020,00025,000ETAGESLOWMIDDLEHIGHTHE STATIONSCT 15,000 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYVISIBILITY, 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-013, FB-SKY-014

The air

35.6 F with a dew point of 23.0 F, 60 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,800 ft up; the lowest cloud reported is at 15,000 ft.

Chart of the air at Broomfield/Jeffco: temperature 35.6 degrees Fahrenheit and dew point 23.0, 60 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,800 feet above the station, against the lowest cloud reported at 15,000 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 STATION02,0004,0006,0008,00010,00010 F20 F30 F40 F50 FSATURATES 2,800 FT ABOVE THE STATION, AT 20.4 FABOVE THIS SHEET: LOWEST CLOUD REPORTED, SCT 15,000 FTTEMPERATURE 35.6 FDEW POINT 23.0 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

Calm.

Plan of the wind at Broomfield/Jeffco, north up: calm; beside it the Beaufort scale from calm to hurricane force, force 0, calm, 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 STATIONCALMBEAUFORT FORCELEAST WIND, MPH0CALM0NOW, 0 MPH1LIGHT AIR12LIGHT BREEZE43GENTLE 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 Lafayette 1N (LAFC2), 3.8 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 Louisville

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

Near Louisville

River and lake gauges