Storm Station
Markham, Illinois
50° 68°/46°
Clear· Feels like 50°·Light air 2 mph SE
Patchy fog. Partly cloudy, with a low around 50. Northeast wind around 0 mph.
0UV Low
43Air quality
89%Humidity
11%Cloud
Now
3:15 AM
50feels50
now, clear
Today
Sep 27
6846
fog
Mon
Sep 28
7149
overcast
Tue
Sep 29
7858
overcast
Wed
Sep 30
8367
42%
overcast
Thu
Oct 1
7762
63%
showers light
Fri
Oct 2
6456
39%
overcast
Sat
Oct 3
7052
24%
overcast
50°
68°46°
71°49°
78°58°
83°67°
77°62°
64°56°
70°52°

As of 3:15 AM in Markham, Illinois.

What is measuring near here

The 4 instruments nearest Markham, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.5 miles away.

measured now2 instruments

HarveyHRVI2

At a river or reservoir gauge/3.1 mi away/612 ft/2 ft below here

temp, wind, gust, humidity, pressure

Rank361of 417

Chicago/LansingIGQ

At an airfield/9.4 mi away/617 ft/3 ft above here

temp, wind, gust, visibility, precip, pressure

Rank283of 417

measured daily2 instruments

Midlothian 1.2 SEIL-CK-260

In a volunteer observer's own ground/1.5 mi away/615 ft/1 ft above here

precip, snowfall, snow depth

Rank-

Park Forest WaterPKFI2

At a cooperative observer's station/7.1 mi away/709 ft/95 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Chicago/Lansing, drawn

The nearest airport reporting now, 9.4 mi from Markham. From its report of Sep 27, 2026, 3:15 AM local time: 3 of its 6 sheets.

The sky

No cloud below 12,000 ft; visibility 5 mi.

Section of the sky over Chicago/Lansing, height above the station to scale: no cloud detected below 12,000 feet, the reach of its ceilometer, and visibility of 5 mi.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT IGQFIG. A THE SKY OVER CHICAGO/LANSINGSECTION, 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: 5 MI0510TITLEChicago/Lansing, the skySTATION REPORT · ASOS IGQTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-09-27IDSR-IGQ-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

46.2 F with a dew point of 45.7 F, 98 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 100 ft up.

Chart of the air at Chicago/Lansing: temperature 46.2 degrees Fahrenheit and dew point 45.7, 98 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 100 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT IGQFIG. B THE AIR AT CHICAGO/LANSINGTHE 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 100 FT ABOVE THE STATION, AT 45.5 FTEMPERATURE AND DEW POINT 46.2 F, 45.7 FRELATIVE HUMIDITY 98 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 POINTTITLEChicago/Lansing, the airSTATION REPORT · ASOS IGQTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-09-27IDSR-IGQ-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 Chicago/Lansing, 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 IGQFIG. C THE WIND AT CHICAGO/LANSINGPLAN, 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 FORCE73TITLEChicago/Lansing, the windSTATION REPORT · ASOS IGQTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-09-27IDSR-IGQ-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Park Forest Water (PKFI2), 7.1 miles from here, read 26 Sep, 05:00. measured daily

Elsewhere in Illinois

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

Near Markham

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