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Janesville, Wisconsin

City in Rock County, Wisconsin

Air quality

The air at Janesville

Index 13, good, led by ozone. Read at 1 AM from its reporting area, Kettle Moraine South (WI), 20 miles off.

13Good
  • Fine particles (PM2.5)11Good-
  • Ozone13Good11 ppb12.2 mi
  • Coarse particles (PM10)4Good-

The days ahead

Good each day through Sat Oct 17, led by ozone. Yesterday measured 23, good.

Smoke, the next 43 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Janesville

0.54 in in the last 24 hours, 1.05 in over the last 3 days, to Fri 12 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.54in
Last 3 days
1.05in

Visibility

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

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

FriSat

On the radar over Janesville, WisconsinReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Janesville, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.8 miles away.

measured now4 instruments

JanesvilleJANW3

At a river or reservoir gauge/1.5 mi away/876 ft/15 ft above here

temp, wind, gust, humidity, pressure

Rank716of 1,313

I-39 / 90 at STH 26WI089

Beside a road/2.8 mi away/915 ft/54 ft above here

temp, pavement temp, wind, visibility, precip

Rank-

measured daily2 instruments

Janesville 1.1 NNEWI-RK-1

In a volunteer observer's own ground/0.8 mi away/876 ft/15 ft above here

precip, snowfall, snow depth

Rank-

Milton WWTPMTOW3

At a water treatment plant/7.2 mi away/876 ft/15 ft above here

snowfall, snow depth, precip, high, low

Rank758of 1,313

Station report

The weather at Janesville/Rock, drawn

The nearest airport reporting now, 5.0 mi from Janesville, Wisconsin. From its report of Oct 16, 2026, 12:55 AM local time: 3 of its 6 sheets.

The sky

Overcast at 1,700 ft; the ceiling is 1,700 ft; visibility 10 mi or more.

Section of the sky over Janesville/Rock, height above the station to scale: overcast cloud with its base at 1,700 feet, the ceiling at 1,700 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT JVLFIG. A THE SKY OVER JANESVILLE/ROCKSECTION, 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 SHEETOVC 1,700 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 1,700 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEJanesville/Rock, the skySTATION REPORT · ASOS JVLTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-JVL-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

51.8 F with a dew point of 48.2 F, 87 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 800 ft up; the lowest cloud reported is at 1,700 ft.

Chart of the air at Janesville/Rock: temperature 51.8 degrees Fahrenheit and dew point 48.2, 87 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 800 feet above the station, against the lowest cloud reported at 1,700 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT JVLFIG. B THE AIR AT JANESVILLE/ROCKTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00040 F50 F60 FSATURATES 800 FT ABOVE THE STATION, AT 47.4 FLOWEST CLOUD REPORTED, OVC 1,700 FTTEMPERATURE 51.8 FDEW POINT 48.2 FSPREAD 3.6 FRELATIVE HUMIDITY 87 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 POINTTITLEJanesville/Rock, the airSTATION REPORT · ASOS JVLTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-JVL-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west northwest (290 degrees) at 15 mph, gusting 25 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 25 mph.

Plan of the wind at Janesville/Rock, north up: blowing from 290 degrees, the west northwest, at 15 miles an hour, gusting 25; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT JVLFIG. C THE WIND AT JANESVILLE/ROCKPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 290°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 15 MPH5FRESH BREEZE196STRONG BREEZE25GUST, 25 MPH7NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEJanesville/Rock, the windSTATION REPORT · ASOS JVLTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-JVL-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

-

Snow on the ground

Elsewhere in Wisconsin

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

Near Janesville

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

Near Janesville

River and lake gauges