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Hartford, Illinois

Village in Madison County, Illinois

Air quality

The air at Hartford

Index 17, good, led by ozone. Read at 12 AM from its reporting area, St. Louis (Metro-east) (IL), 19 miles off.

17Good
  • Fine particles (PM2.5)11Good2.1 mi
  • Ozone17Good14 ppb2.1 mi
  • Coarse particles (PM10)6Good8.9 mi
  • Nitrogen dioxide5Good5.3 ppb7.4 mi
  • Sulfur dioxide0Good0.4 ppb13.1 mi
  • Carbon monoxide-0 ppm13.1 mi

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 39, good.

Smoke, the next 43 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Hartford

0.56 in in the last 24 hours, 1.30 in over the last 3 days, to Fri 12 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.56in
Last 3 days
1.30in

Visibility

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

Visibility stays 9 miles or more through Sat 7 PM, lowest 10 miles Fri 6 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Hartford, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.4 miles away.

measured now4 instruments

measured daily2 instruments

AltonALNI2

At a cooperative observer's station/5.9 mi away/394 ft/36 ft below here

snowfall, snow depth, precip, high, low

Rank981of 1,393

Station report

The weather at Alton/St Louis R, drawn

The nearest airport reporting now, 4.8 mi from Hartford, Illinois. From its report of Oct 16, 2026, 1:15 AM local time: 3 of its 6 sheets.

The sky

Scattered at 1,300 ft, broken at 2,200 ft, overcast at 7,500 ft; the ceiling is 2,200 ft; visibility 10 mi or more.

Section of the sky over Alton/St Louis R, height above the station to scale: scattered cloud with its base at 1,300 feet, broken cloud with its base at 2,200 feet, overcast cloud with its base at 7,500 feet, the ceiling at 2,200 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ALNFIG. A THE SKY OVER ALTON/ST LOUIS RSECTION, 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 STATION02,5005,0007,50010,00012,500ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FTOVC 7,500 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 2,200 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYSCT 1,300 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYCEILING 2,200 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEAlton/St Louis R, the skySTATION REPORT · ASOS ALNTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-ALN-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018, FB-SKY-013, FB-SKY-014

The air

56.3 F with a dew point of 52.7 F, 88 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 1,300 ft.

Chart of the air at Alton/St Louis R: temperature 56.3 degrees Fahrenheit and dew point 52.7, 88 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 1,300 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ALNFIG. B THE AIR AT ALTON/ST LOUIS RTHE 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 F70 FSATURATES 800 FT ABOVE THE STATION, AT 51.8 FLOWEST CLOUD REPORTED, SCT 1,300 FTTEMPERATURE 56.3 FDEW POINT 52.7 FSPREAD 3.6 FRELATIVE HUMIDITY 88 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 POINTTITLEAlton/St Louis R, the airSTATION REPORT · ASOS ALNTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-ALN-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the west northwest (300 degrees) at 15 mph, gusting 23 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 26 mph.

Plan of the wind at Alton/St Louis R, north up: blowing from 300 degrees, the west northwest, at 15 miles an hour, gusting 23; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT ALNFIG. C THE WIND AT ALTON/ST LOUIS RPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 300°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 15 MPH5FRESH BREEZE19GUST, 23 MPH6STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEAlton/St Louis R, the windSTATION REPORT · ASOS ALNTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-ALN-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Alton/St Louis R, in 6 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at Mississippi River AT Mel Price LD (ALNI2), 5.9 miles from here, read 15 Oct, 05:00. measured daily

Elsewhere in Illinois

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

Near Hartford

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

Near Hartford

River and lake gauges