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Johnston, Iowa

City in Polk County, Iowa

Air quality

The air at Johnston

Index 22, good, led by ozone. Read at 4 PM from its reporting area, Des Moines (IA), 11 miles off.

22Good
  • Fine particles (PM2.5)15Good6.9 mi
  • Ozone22Good24 ppb6.9 mi

The days ahead

Good each day through Sat Oct 17, led by fine particles. Yesterday measured 18, good.

Smoke, the next 45 hours

No smoke near the ground through Sun 1 PM.

FriSatSun

Precipitation

What has fallen at Johnston

0.05 in in the last 24 hours, 0.65 in over the last 3 days, to Fri 4 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.05in
Last 3 days
0.65in

Visibility

How far you can see at Johnston, the next 45 hours

Visibility stays 7 miles or more through Sun 1 PM, lowest 8 miles Sat 5 AM.

FriSatSun

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

What is measuring near here

The 8 instruments nearest Johnston, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.0 miles away.

measured now6 instruments

GrangerRGAI4

Beside a road/4.8 mi away/863 ft/26 ft above here

temp, pavement temp, wind, visibility, precip

Rank893of 1,060

AnkenyIKV

At an airfield/8.4 mi away/888 ft/51 ft above here

temp, wind, gust, visibility, precip, pressure

Rank152of 1,060

AmesS2031

At a soil climate station/22.3 mi away/1,073 ft/236 ft above here

temp, humidity, soil temp, soil moisture

Rank748of 1,060

measured daily2 instruments

JohnstonUBSI4

At a cooperative observer's station/1.1 mi away/942 ft/105 ft above here

snowfall, snow depth, precip, high, low

Rank795of 1,060

Station report

The weather at Ankeny, drawn

The nearest airport reporting now, 8.4 mi from Johnston, Iowa. From its report of Oct 16, 2026, 4:35 PM local time: 3 of its 6 sheets.

The sky

Broken at 5,000 ft, broken at 5,500 ft; the ceiling is 5,000 ft; visibility 10 mi or more.

Section of the sky over Ankeny, height above the station to scale: broken cloud with its base at 5,000 feet, broken cloud with its base at 5,500 feet, the ceiling at 5,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT IKVFIG. A THE SKY OVER ANKENYSECTION, 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 STATION02,5005,0007,50010,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETBKN 5,500 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYBKN 5,000 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 5,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEAnkeny, the skySTATION REPORT · ASOS IKVTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-IKV-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

53.6 F with a dew point of 37.4 F, 54 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 3,700 ft up; the lowest cloud reported is at 5,000 ft.

Chart of the air at Ankeny: temperature 53.6 degrees Fahrenheit and dew point 37.4, 54 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 3,700 feet above the station, against the lowest cloud reported at 5,000 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT IKVFIG. B THE AIR AT ANKENYTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,0007,00020 F30 F40 F50 F60 FSATURATES 3,700 FT ABOVE THE STATION, AT 33.9 FLOWEST CLOUD REPORTED, BKN 5,000 FTTEMPERATURE 53.6 FDEW POINT 37.4 FSPREAD 16.2 FRELATIVE HUMIDITY 54 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 POINTTITLEAnkeny, the airSTATION REPORT · ASOS IKVTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-IKV-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north northwest (340 degrees) at 15 mph, gusting 29 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 40 mph.

Plan of the wind at Ankeny, north up: blowing from 340 degrees, the north northwest, at 15 miles an hour, gusting 29; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT IKVFIG. C THE WIND AT ANKENYPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 340°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 15 MPH5FRESH BREEZE196STRONG BREEZE25GUST, 29 MPH7NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEAnkeny, the windSTATION REPORT · ASOS IKVTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-IKV-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Johnston (UBSI4), 1.1 miles from here, read 16 Oct, 07:00. measured daily

Elsewhere in Iowa

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

Near Johnston

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

Near Johnston

River and lake gauges