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Diamond, Illinois

Village in Grundy County, Illinois

Air quality

The air at Diamond

Index 22, good, led by fine particles. Read at 10 PM from its reporting area, Joliet and Will County (IL), 10 miles off.

22Good
  • Fine particles (PM2.5)22Good5.9 mi
  • Ozone10Good8 ppb5.9 mi

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 50, good.

Smoke, the next 45 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Diamond

0.22 in in the last 24 hours, 0.53 in over the last 3 days, to Thu 10 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.22in
Last 3 days
0.53in

Visibility

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

Visibility stays 8 miles or more through Sat 7 PM, lowest 9 miles Thu 11 PM.

FriSat

On the radar over Diamond, IllinoisReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Diamond, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.2 miles away.

measured now4 instruments

Morris-WashburnC09

At an airfield/12.7 mi away/584 ft/21 ft above here

temp, wind, gust, visibility, precip, pressure

Rank-

measured daily2 instruments

Station report

The weather at Midewin Tallgrass Prairie, drawn

The nearest instrument reporting now, 7.4 mi from Diamond, Illinois. From its report of Oct 15, 2026, 10:23 PM local time: 3 of its 5 sheets.

The air

67.0 F with a dew point of 63.9 F, 90 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 700 ft up.

Chart of the air at Midewin Tallgrass Prairie: temperature 67.0 degrees Fahrenheit and dew point 63.9, 90 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 700 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT WMGI2FIG. B THE AIR AT MIDEWIN TALLGRASS PRAIRIETHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00050 F60 F70 F80 FSATURATES 700 FT ABOVE THE STATION, AT 63.2 FTEMPERATURE 67.0 FDEW POINT 63.9 FSPREAD 3.1 FRELATIVE HUMIDITY 90 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 POINTTITLEMidewin Tallgrass Prairie, the airSTATION REPORT · DCP WMGI2TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 5DATE2026-10-16IDSR-WMGI2-1DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west (261 degrees) at 9 mph, gusting 20 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 23 mph.

Plan of the wind at Midewin Tallgrass Prairie, north up: blowing from 261 degrees, the west, at 9 miles an hour, gusting 20; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT WMGI2FIG. C THE WIND AT MIDEWIN TALLGRASS PRAIRIEPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 261°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 9 MPH4MODERATE BREEZE135FRESH BREEZE19GUST, 20 MPH6STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEMidewin Tallgrass Prairie, the windSTATION REPORT · DCP WMGI2TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 2 of 5DATE2026-10-16IDSR-WMGI2-2DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008

The column

At 561 ft above sea level, 2 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.32 inHg and the temperature at 57.0 F; it reports 67.0 F, 10.0 F warmer than standard.

Section from sea level of where Midewin Tallgrass Prairie stands in the atmosphere, height to scale: the station 561 feet above sea level with 2 per cent of the air below it; the standard atmosphere's pressure there, 29.32 inches of mercury, and temperature, 57.0 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT WMGI2FIG. D WHERE MIDEWIN TALLGRASS PRAIRIE STANDS IN THE ATMOSPHERESECTION FROM SEA LEVEL, HEIGHT TO SCALE, THE STATION IN THE STANDARD ATMOSPHEREFT ABOVE SEA LEVEL05,00010,00015,000SEA LEVEL, 29.92 inHg IN THE STANDARD ATMOSPHEREMIDEWIN TALLGRASS PRAIRIE2 PER CENT OF THE AIR BELOW IT561 FT10 PER CENT OF THE AIR BELOW, 2,890 FT20 PER CENT OF THE AIR BELOW, 6,050 FT30 PER CENT OF THE AIR BELOW, 9,540 FT40 PER CENT OF THE AIR BELOW, 13,470 FTSTANDARD PRESSURE HERE29.32 inHgSTANDARD TEMPERATURE HERE57.0 FTEMPERATURE, REPORTED67.0 FTITLEMidewin Tallgrass Prairie, the columnSTATION REPORT · DCP WMGI2TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 3 of 5DATE2026-10-16IDSR-WMGI2-3DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The full report of Midewin Tallgrass Prairie, in 5 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at Coal City 4NNW (Hydro) (CTYI2), 4.3 miles from here, read 15 Oct, 07:00. measured daily

Elsewhere in Illinois

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

Near Diamond

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

Near Diamond

River and lake gauges