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Martinsburg, Iowa

City in Keokuk County, Iowa

Air quality

The air at Martinsburg

Index 15, good, led by ozone. Read at 11 AM from its reporting area, Lake Sugema (IA), 36 miles off.

15Good
  • Fine particles (PM2.5)13Good-
  • Ozone15Good-

The days ahead

Good each day through Today, led by fine particles. Yesterday measured 28, good.

Smoke, the next 45 hours

No smoke near the ground through Sun 7 AM.

FriSatSun

Precipitation

What has fallen at Martinsburg

0.08 in in the last 24 hours, 0.16 in over the last 3 days, to Fri 10 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.08in
Last 3 days
0.16in

Visibility

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

Visibility stays 6 miles or more through Sun 7 AM, lowest 6 miles Fri 2 PM.

FriSatSun

On the radar over Martinsburg, IowaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Martinsburg, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.0 miles away.

measured now4 instruments

Sigourney (IA 92)RSGI4

Beside a road/11.4 mi away/663 ft/148 ft below here

temp, pavement temp, wind, visibility, precip

Rank-

OttumwaOTM

At an airfield/11.4 mi away/846 ft/35 ft above here

temp, wind, gust, visibility, precip, pressure

Rank-

Citizen station GW2804GW2804

In a volunteer observer's own ground/19.1 mi away/751 ft/60 ft below here

temp, humidity, wind, precip, pressure

Rank-

Mount Pleasant 1 SSW [CCOOP]MPZI4

At a river or reservoir gauge/39.8 mi away/719 ft/92 ft below here

temp, wind, gust, humidity, pressure

Rank-

measured daily2 instruments

Hedrick 4.0 ENEIA-KK-4

In a volunteer observer's own ground/1.0 mi away/808 ft/3 ft below here

precip, snowfall, snow depth

Rank-

SigourneySGYI4

At a cooperative observer's station/11.0 mi away/784 ft/27 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Sigourney (IA 92), drawn

The nearest instrument reporting now, 11.4 mi from Martinsburg, Iowa. From its report of Oct 16, 2026, 11:05 AM local time: 3 of its 5 sheets.

The air

49.5 F with a dew point of 46.4 F, 89 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 Sigourney (IA 92): temperature 49.5 degrees Fahrenheit and dew point 46.4, 89 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 RSGI4FIG. B THE AIR AT SIGOURNEY (IA 92)THE 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 700 FT ABOVE THE STATION, AT 45.6 FTEMPERATURE 49.5 FDEW POINT 46.4 FSPREAD 3.1 FRELATIVE HUMIDITY 89 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 POINTTITLESigourney (IA 92), the airSTATION REPORT · RWIS RSGI4TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 5DATE2026-10-16IDSR-RSGI4-1DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north (350 degrees) at 11 mph, gusting 21 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 114 mph.

Plan of the wind at Sigourney (IA 92), north up: blowing from 350 degrees, the north, at 11 miles an hour, gusting 21; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RSGI4FIG. C THE WIND AT SIGOURNEY (IA 92)PLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 350°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 11 MPH4MODERATE BREEZE135FRESH BREEZE19GUST, 21 MPH6STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLESigourney (IA 92), the windSTATION REPORT · RWIS RSGI4TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 2 of 5DATE2026-10-16IDSR-RSGI4-2DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008

The column

At 663 ft above sea level, 2 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.21 inHg and the temperature at 56.6 F; it reports 49.5 F, 7.1 F colder than standard.

Section from sea level of where Sigourney (IA 92) stands in the atmosphere, height to scale: the station 663 feet above sea level with 2 per cent of the air below it; the standard atmosphere's pressure there, 29.21 inches of mercury, and temperature, 56.6 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RSGI4FIG. D WHERE SIGOURNEY (IA 92) 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 ATMOSPHERESIGOURNEY (IA 92)2 PER CENT OF THE AIR BELOW IT663 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 HERE29.21 inHgSTANDARD TEMPERATURE HERE56.6 FTEMPERATURE, REPORTED49.5 FTITLESigourney (IA 92), the columnSTATION REPORT · RWIS RSGI4TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 3 of 5DATE2026-10-16IDSR-RSGI4-3DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The full report of Sigourney (IA 92), in 5 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at Sigourney (SGYI4), 11.0 miles from here, read 16 Oct, 06:00. measured daily

Elsewhere in Iowa

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

Near Martinsburg

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

Near Martinsburg

River and lake gauges