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Castana, Iowa

City in Monona County, Iowa

Air quality

The air at Castana

Index 21, good, led by ozone. Read at 12 AM from its reporting area, Pisgah (IA), 16 miles off.

21Good
  • Ozone21Good24 ppb16.5 mi

The days ahead

Good each day through Today, led by ozone. Yesterday measured 17, good.

Smoke, the next 43 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Castana

0.88 in in the last 24 hours, and none in the 2 days before, to Fri 12 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.88in
Last 3 days
0.88in

Visibility

How far you can see at Castana, the next 43 hours

Visibility stays 8 miles or more through Sat 7 PM, lowest 8 miles Sat 8 AM.

FriSat

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

What is measuring near here

The 7 instruments nearest Castana, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 8.9 miles away.

measured now5 instruments

Sloan I-29RSOI4

Beside a road/17.8 mi away/1,053 ft/131 ft below here

temp, pavement temp, wind, visibility, precip

Rank851of 1,060

DenisonDNS

At an airfield/27.8 mi away/1,250 ft/66 ft above here

temp, wind, gust, visibility, precip, pressure

Rank371of 1,060

measured daily2 instruments

Mapleton 0.2 SEIA-MN-4

In a volunteer observer's own ground/8.9 mi away/1,153 ft/31 ft below here

precip, snowfall, snow depth

Rank-

Mapleton No. 2MPTI4

At a cooperative observer's station/9.1 mi away/1,161 ft/23 ft below here

snowfall, snow depth, precip, high, low

Rank27of 1,060

Station report

The weather at Denison, drawn

The nearest airport reporting now, 27.8 mi from Castana, Iowa. From its report of Oct 16, 2026, 12:35 AM local time: 3 of its 6 sheets.

The sky

Overcast at 5,000 ft; the ceiling is 5,000 ft; visibility 10 mi or more.

Section of the sky over Denison, height above the station to scale: overcast cloud with its base at 5,000 feet, the ceiling at 5,000 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 SKYCEILING 5,000 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 5,000 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 5,000 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 STATION01,0002,0003,0004,0005,0006,0007,00030 F40 F50 F60 FSATURATES 1,700 FT ABOVE THE STATION, AT 37.6 FLOWEST CLOUD REPORTED, OVC 5,000 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 northwest (310 degrees) at 14 mph, gusting 22 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 25 mph.

Plan of the wind at Denison, north up: blowing from 310 degrees, the northwest, at 14 miles an hour, gusting 22; beside it the Beaufort scale from calm to hurricane force, force 4, moderate 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 310°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 14 MPH5FRESH BREEZE19GUST, 22 MPH6STRONG BREEZE257NEAR 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

0in

Snow on the ground

Measured at Mapleton No. 2 (MPTI4), 9.1 miles from here, read 15 Oct, 07:00. measured daily

Elsewhere in Iowa

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

Near Castana

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

Near Castana

River and lake gauges