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Jefferson, Iowa

City in Greene County, Iowa

Air quality

The air at Jefferson

Index 16, good, led by ozone. Read at 11 AM from its reporting area, Des Moines (IA), 50 miles off.

16Good
  • Fine particles (PM2.5)15Good-
  • Ozone16Good-

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 7 AM.

FriSatSun

Precipitation

What has fallen at Jefferson

0.29 in in the last 24 hours, 0.51 in over the last 3 days, to Fri 10 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.29in
Last 3 days
0.51in

Visibility

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

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

FriSatSun

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

What is measuring near here

The 7 instruments nearest Jefferson, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.1 miles away.

measured now5 instruments

PerryPRO

At an airfield/17.2 mi away/1,004 ft/55 ft below here

temp, wind, gust, visibility, precip, pressure

Rank638of 1,060

Ames ScanAMMI4

At a river or reservoir gauge/33.2 mi away/1,073 ft/14 ft above here

temp, wind, gust, humidity, pressure

Rank720of 1,060

AmesS2031

At a soil climate station/33.9 mi away/1,073 ft/14 ft above here

temp, humidity, soil temp, soil moisture

Rank748of 1,060

measured daily2 instruments

Jefferson 2 NWJFFI4

At a cooperative observer's station/0.1 mi away/1,060 ft/1 ft above here

snowfall, snow depth, precip, high, low

Rank-

Jefferson 0.1 ENEIA-GN-8

In a volunteer observer's own ground/0.5 mi away/1,063 ft/4 ft above here

precip, snowfall, snow depth

Rank-

Station report

The weather at Perry, drawn

The nearest airport reporting now, 17.2 mi from Jefferson, Iowa. From its report of Oct 16, 2026, 11:15 AM local time: 3 of its 6 sheets.

The sky

Overcast at 2,700 ft; the ceiling is 2,700 ft; visibility 9 mi.

Section of the sky over Perry, height above the station to scale: overcast cloud with its base at 2,700 feet, the ceiling at 2,700 feet, and visibility of 9 mi.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT PROFIG. A THE SKY OVER PERRYSECTION, 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 STATION01,0002,0003,0004,0005,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 2,700 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 2,700 FTVISIBILITY, MILES: 9 MI0510TITLEPerry, the skySTATION REPORT · ASOS PROTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-PRO-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

47.5 F with a dew point of 41.0 F, 78 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,500 ft up; the lowest cloud reported is at 2,700 ft.

Chart of the air at Perry: temperature 47.5 degrees Fahrenheit and dew point 41.0, 78 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,500 feet above the station, against the lowest cloud reported at 2,700 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT PROFIG. B THE AIR AT PERRYTHE 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 1,500 FT ABOVE THE STATION, AT 39.5 FLOWEST CLOUD REPORTED, OVC 2,700 FTTEMPERATURE 47.5 FDEW POINT 41.0 FSPREAD 6.5 FRELATIVE HUMIDITY 78 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 POINTTITLEPerry, the airSTATION REPORT · ASOS PROTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-PRO-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north northwest (340 degrees) at 22 mph, gusting 36 mph: force 5, a fresh breeze on the Beaufort scale. The strongest gust today was 38 mph.

Plan of the wind at Perry, north up: blowing from 340 degrees, the north northwest, at 22 miles an hour, gusting 36; beside it the Beaufort scale from calm to hurricane force, force 5, fresh breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT PROFIG. C THE WIND AT PERRYPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 340°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE19NOW, 22 MPH6STRONG BREEZE257NEAR GALE32GUST, 36 MPH8GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEPerry, the windSTATION REPORT · ASOS PROTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-PRO-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Perry, 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 Jefferson

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

Near Jefferson

River and lake gauges