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Defiance, Iowa

City in Shelby County, Iowa

Air quality

The air at Defiance

Index 16, good, led by ozone. Read at 6 AM from its reporting area, Pisgah (IA), 30 miles off.

16Good
  • Ozone16Good-

The days ahead

Good each day through Today, led by ozone. Yesterday measured 20, good.

Smoke, the next 44 hours

No smoke near the ground through Sun 1 AM.

FriSat

Precipitation

What has fallen at Defiance

0.87 in in the last 24 hours, 1.10 in over the last 3 days, to Fri 5 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.87in
Last 3 days
1.10in

Visibility

How far you can see at Defiance, the next 44 hours

Visibility stays 8 miles or more through Sun 1 AM, lowest 8 miles Sat 4 AM.

FriSat

On the radar over Defiance, IowaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Defiance, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 4.6 miles away.

measured now4 instruments

DenisonRDNI4

Beside a road/6.1 mi away/1,398 ft/133 ft above here

temp, pavement temp, wind, visibility, precip

Rank1,021of 1,060

Irwin 3 ESEIRWI4

At a river or reservoir gauge/10.6 mi away/1,322 ft/57 ft above here

temp, wind, gust, humidity, pressure

Rank-

DenisonDNS

At an airfield/11.0 mi away/1,250 ft/15 ft below here

temp, wind, gust, visibility, precip, pressure

Rank371of 1,060

measured daily2 instruments

Earling 3.1 NIA-SH-5

In a volunteer observer's own ground/4.6 mi away/1,338 ft/73 ft above here

precip, snowfall, snow depth

Rank-

DenisonDNSI4

At a cooperative observer's station/14.4 mi away/1,394 ft/129 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Denison, drawn

The nearest airport reporting now, 11.0 mi from Defiance, Iowa. From its report of Oct 16, 2026, 6:15 AM local time: 3 of its 6 sheets.

The sky

Broken at 2,900 ft, broken at 3,900 ft, overcast at 5,000 ft; the ceiling is 2,900 ft; visibility 10 mi or more.

Section of the sky over Denison, height above the station to scale: broken cloud with its base at 2,900 feet, broken cloud with its base at 3,900 feet, overcast cloud with its base at 5,000 feet, the ceiling at 2,900 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DNSFIG. A THE SKY OVER DENISONSECTION, 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 STATION01,0002,0003,0004,0005,0006,0007,0008,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 5,000 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 3,900 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYBKN 2,900 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 2,900 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEDenison, the skySTATION REPORT · ASOS DNSTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-DNS-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

46.4 F with a dew point of 39.2 F, 76 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,700 ft up; the lowest cloud reported is at 2,900 ft.

Chart of the air at Denison: temperature 46.4 degrees Fahrenheit and dew point 39.2, 76 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,700 feet above the station, against the lowest cloud reported at 2,900 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DNSFIG. B THE AIR AT DENISONTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,00030 F40 F50 F60 FSATURATES 1,700 FT ABOVE THE STATION, AT 37.6 FLOWEST CLOUD REPORTED, BKN 2,900 FTTEMPERATURE 46.4 FDEW POINT 39.2 FSPREAD 7.2 FRELATIVE HUMIDITY 76 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 POINTTITLEDenison, the airSTATION REPORT · ASOS DNSTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-DNS-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north northwest (330 degrees) at 24 mph, gusting 30 mph: force 5, a fresh breeze on the Beaufort scale. The strongest gust today was 39 mph.

Plan of the wind at Denison, north up: blowing from 330 degrees, the north northwest, at 24 miles an hour, gusting 30; beside it the Beaufort scale from calm to hurricane force, force 5, fresh breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DNSFIG. C THE WIND AT DENISONPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 330°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE19NOW, 24 MPH6STRONG BREEZE25GUST, 30 MPH7NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEDenison, the windSTATION REPORT · ASOS DNSTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-DNS-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

-

Snow on the ground

Elsewhere in Iowa

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

Near Defiance

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

Near Defiance

River and lake gauges