Storm Station
Lake Koshkonong, Wisconsin
51°
Partly cloudy· Feels like 51°·Light air 3 mph E
Patchy fog before 8am. Partly sunny, with a high near 69. Northeast wind around 0 mph.
-UV
-Air quality
89%Humidity
47%Cloud

What is measuring near here

The 5 instruments nearest Lake Koshkonong, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.3 miles away.

measured now3 instruments

JanesvilleJANW3

At a river or reservoir gauge/13.4 mi away/876 ft/97 ft above here

temp, wind, gust, humidity, pressure

Rank-

Janesville/RockJVL

At an airfield/19.7 mi away/807 ft/28 ft above here

temp, wind, gust, visibility, precip, pressure

Rank335of 347

measured daily2 instruments

Fort Atkinson 2SWFTAW3

At a cooperative observer's station/2.3 mi away/794 ft/15 ft above here

snowfall, snow depth, precip, high, low

Rank-

Fort Atkinson 4.3 WWI-JF-40

In a volunteer observer's own ground/3.3 mi away/884 ft/105 ft above here

precip, snowfall, snow depth

Rank-

Station report

The weather at Janesville/Rock, drawn

The nearest airport reporting now, 19.7 mi from Lake Koshkonong. From its report of Sep 27, 2026, 5:45 AM local time: 3 of its 6 sheets.

The sky

Clear; visibility 3 mi.

Section of the sky over Janesville/Rock, height above the station to scale: a clear sky, and visibility of 3 mi.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 STATIONCLEARVISIBILITY, MILES: 3 MI0510TITLEJanesville/Rock, the skySTATION REPORT · ASOS JVLTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-09-27IDSR-JVL-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

46.4 F with a dew point of 46.4 F, 100 per cent relative humidity. The air is saturated at the ground.

Chart of the air at Janesville/Rock: temperature 46.4 degrees Fahrenheit and dew point 46.4, 100 per cent relative humidity; the air saturated at the ground; 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 FSATURATED AT THE GROUNDTEMPERATURE AND DEW POINT 46.4 F, 46.4 FRELATIVE HUMIDITY 100 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 6DATE2026-09-27IDSR-JVL-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Janesville/Rock, north up: calm; beside it the Beaufort scale from calm to hurricane force, force 0, calm, 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 STATIONCALMBEAUFORT FORCELEAST WIND, MPH0CALM0NOW, 0 MPH1LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEJanesville/Rock, the windSTATION REPORT · ASOS JVLTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-09-27IDSR-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

0in

Snow on the ground

Measured at Fort Atkinson 2SW (FTAW3), 2.3 miles from here, read 26 Sep, 06:40. measured daily

Elsewhere in Wisconsin

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

Near Lake Koshkonong

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