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Tiffin, Iowa

City in Johnson County, Iowa

Air quality

The air at Tiffin

Index 20, good, led by fine particles. Read at 4 AM from its reporting area, Iowa City (IA), 6 miles off.

20Good
  • Fine particles (PM2.5)20Good8.8 mi
  • Ozone-14 ppb18.5 mi
  • Sulfur dioxide0Good0.1 ppb18.5 mi

The days ahead

Good each day through Today, led by ozone. Yesterday measured 26, good.

Smoke, the next 46 hours

No smoke near the ground through Sun 1 AM.

FriSat

Precipitation

What has fallen at Tiffin

0.18 in in the last 24 hours, 0.20 in over the last 3 days, to Fri 3 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.18in
Last 3 days
0.20in

Visibility

How far you can see at Tiffin, the next 46 hours

Visibility stays 7 miles or more through Sun 1 AM, lowest 8 miles Sat 8 AM.

FriSat

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

What is measuring near here

The 6 instruments nearest Tiffin, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.3 miles away.

measured now4 instruments

Iowa CityIOW

At an airfield/7.8 mi away/669 ft/58 ft below here

temp, wind, gust, visibility, precip, pressure

Rank12of 1,060

measured daily2 instruments

Tiffin 0.8 EIA-JH-3

In a volunteer observer's own ground/0.3 mi away/696 ft/31 ft below here

precip, snowfall, snow depth

Rank-

Iowa CityICYI4

At a cooperative observer's station/7.9 mi away/650 ft/77 ft below here

snowfall, snow depth, precip, high, low

Rank81of 1,060

Station report

The weather at Iowa City, drawn

The nearest airport reporting now, 7.8 mi from Tiffin, Iowa. From its report of Oct 16, 2026, 3:52 AM local time: 3 of its 6 sheets.

The sky

No cloud below 12,000 ft; visibility 10 mi or more.

Section of the sky over Iowa City, height above the station to scale: no cloud detected below 12,000 feet, the reach of its ceilometer, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT IOWFIG. A THE SKY OVER IOWA CITYSECTION, 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 STATION05001,0001,5002,0002,5003,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETNO CLOUD DETECTED BELOW 12,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEIowa City, the skySTATION REPORT · ASOS IOWTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-IOW-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

47.0 F with a dew point of 41.0 F, 80 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,400 ft up.

Chart of the air at Iowa City: temperature 47.0 degrees Fahrenheit and dew point 41.0, 80 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,400 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT IOWFIG. B THE AIR AT IOWA CITYTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00030 F40 F50 F60 FSATURATES 1,400 FT ABOVE THE STATION, AT 39.7 FTEMPERATURE 47.0 FDEW POINT 41.0 FSPREAD 6.0 FRELATIVE HUMIDITY 80 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 POINTTITLEIowa City, the airSTATION REPORT · ASOS IOWTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-IOW-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west (280 degrees) at 12 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 32 mph.

Plan of the wind at Iowa City, north up: blowing from 280 degrees, the west, at 12 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT IOWFIG. C THE WIND AT IOWA CITYPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 280°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 12 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEIowa City, the windSTATION REPORT · ASOS IOWTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-IOW-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Iowa City (ICYI4), 7.9 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 Tiffin

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

Near Tiffin

River and lake gauges