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St. Lucas, Iowa

City in Fayette County, Iowa

Air quality

The air at St. Lucas

Index 43, good, led by fine particles. Read at 12 AM from its reporting area, Waterloo (IA), 46 miles off.

43Good
  • Fine particles (PM2.5)43Good-

The days ahead

Good each day through Today, led by ozone. Yesterday measured 31, good.

Smoke, the next 44 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at St. Lucas

0.88 in in the last 24 hours, 0.94 in over the last 3 days, to Thu 11 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.88in
Last 3 days
0.94in

Visibility

How far you can see at St. Lucas, the next 44 hours

Visibility stays 5 miles or more through Sat 7 PM, lowest 6 miles Fri 6 AM.

FriSat

On the radar over St. Lucas, IowaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest St. Lucas, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 5.0 miles away.

measured now4 instruments

HawkeyeHKYI4

Beside a road/7.2 mi away/1,074 ft/3 ft below here

temp, pavement temp, wind, visibility, precip

Rank851of 1,060

DecorahDEH

At an airfield/17.3 mi away/1,157 ft/80 ft above here

temp, wind, gust, visibility, precip, pressure

Rank197of 1,060

measured daily2 instruments

Waucoma 1WNWWACI4

At a cooperative observer's station/5.7 mi away/1,056 ft/21 ft below here

snowfall, snow depth, precip, high, low

Rank839of 1,060

West Union 6.1 NIA-FY-6

In a volunteer observer's own ground/6.0 mi away/935 ft/142 ft below here

precip, snowfall, snow depth

Rank-

Station report

The weather at Decorah, drawn

The nearest airport reporting now, 17.3 mi from St. Lucas, Iowa. From its report of Oct 16, 2026, 12:15 AM local time: 3 of its 6 sheets.

The sky

Broken at 3,300 ft, overcast at 4,400 ft; the ceiling is 3,300 ft; visibility 10 mi or more.

Section of the sky over Decorah, height above the station to scale: broken cloud with its base at 3,300 feet, overcast cloud with its base at 4,400 feet, the ceiling at 3,300 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DEHFIG. A THE SKY OVER DECORAHSECTION, 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 STATION01,0002,0003,0004,0005,0006,0007,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 4,400 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 3,300 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 3,300 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEDecorah, the skySTATION REPORT · ASOS DEHTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-DEH-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

48.2 F with a dew point of 42.8 F, 81 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,200 ft up; the lowest cloud reported is at 3,300 ft.

Chart of the air at Decorah: temperature 48.2 degrees Fahrenheit and dew point 42.8, 81 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,200 feet above the station, against the lowest cloud reported at 3,300 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DEHFIG. B THE AIR AT DECORAHTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,00030 F40 F50 F60 FSATURATES 1,200 FT ABOVE THE STATION, AT 41.6 FLOWEST CLOUD REPORTED, BKN 3,300 FTTEMPERATURE 48.2 FDEW POINT 42.8 FSPREAD 5.4 FRELATIVE HUMIDITY 81 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 POINTTITLEDecorah, the airSTATION REPORT · ASOS DEHTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-DEH-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northwest (310 degrees) at 10 mph, gusting 22 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 22 mph.

Plan of the wind at Decorah, north up: blowing from 310 degrees, the northwest, at 10 miles an hour, gusting 22; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DEHFIG. C THE WIND AT DECORAHPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 310°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 10 MPH4MODERATE BREEZE135FRESH BREEZE19GUST, 22 MPH6STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEDecorah, the windSTATION REPORT · ASOS DEHTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-DEH-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

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Snow on the ground

Elsewhere in Iowa

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

Near St. Lucas

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

Near St. Lucas

River and lake gauges