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Thornton, Colorado

City in Adams County, Colorado

Air quality

The air at Thornton

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)39Good8.8 mi
  • Ozone29Good32 ppb4.9 mi
  • Coarse particles (PM10)10Good18.2 mi
  • Nitrogen dioxide2Good2.6 ppb4.9 mi
  • Sulfur dioxide0Good0.4 ppb11.2 mi
  • Carbon monoxide-0.1 ppm9.5 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 Thornton

0.03 in in the last 24 hours, 0.78 in over the last 3 days, to Fri 1 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.03in
Last 3 days
0.78in

Visibility

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

Visibility stays 10 miles or more through Sat 6 PM.

FriSat

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

What is measuring near here

The 7 instruments nearest Thornton, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.5 miles away.

measured now5 instruments

ErieEIK

At an airfield/8.6 mi away/5,130 ft/122 ft below here

temp, wind, gust, visibility, precip, pressure

Rank1,669of 2,650

measured daily2 instruments

Thornton 1.1 NCO-AD-253

In a volunteer observer's own ground/0.5 mi away/5,297 ft/45 ft above here

precip, snowfall, snow depth

Rank-

Station report

The weather at Erie, drawn

The nearest airport reporting now, 8.6 mi from Thornton, Colorado. From its report of Oct 16, 2026, 2:15 AM local time: 3 of its 6 sheets.

The sky

Broken at 3,900 ft; the ceiling is 3,900 ft; visibility 10 mi or more.

Section of the sky over Erie, height above the station to scale: broken cloud with its base at 3,900 feet, the ceiling at 3,900 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT EIKFIG. A THE SKY OVER ERIESECTION, 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 SHEETBKN 3,900 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 3,900 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEErie, the skySTATION REPORT · ASOS EIKTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-EIK-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

36.3 F with a dew point of 29.7 F, 77 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,500 ft up; the lowest cloud reported is at 3,900 ft.

Chart of the air at Erie: temperature 36.3 degrees Fahrenheit and dew point 29.7, 77 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,500 feet above the station, against the lowest cloud reported at 3,900 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT EIKFIG. B THE AIR AT ERIETHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,00020 F30 F40 F50 FSATURATES 1,500 FT ABOVE THE STATION, AT 28.2 FLOWEST CLOUD REPORTED, BKN 3,900 FTTEMPERATURE 36.3 FDEW POINT 29.7 FSPREAD 6.6 FRELATIVE HUMIDITY 77 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 POINTTITLEErie, the airSTATION REPORT · ASOS EIKTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-EIK-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the east (80 degrees) at 5 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at Erie, north up: blowing from 80 degrees, the east, at 5 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 EIKFIG. C THE WIND AT ERIEPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 80°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 5 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEErie, the windSTATION REPORT · ASOS EIKTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-EIK-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Westminster 5Ne (WSMC2), 3.6 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 Thornton

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

Near Thornton

River and lake gauges