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Shaded-relief map of Martinsburg, Iowa: rivers, roads, the city limits and where the water drains.
IOWA · KEOKUK COUNTY

Martinsburg

109 people, 810 ft above sea level in Keokuk County.

810 ftElevation, city center
109People, 2024 estimate
0 sq miLand area
Clear 40°
Clear now Dew point 30° · E 5 mph · high 39°
City of Martinsburg River Interstate 2 miles
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The Martinsburg plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.

MILE1
TODAY

Today in Martinsburg

NWS forecast and National Blend of Models · updated 5:00 PM CST
RIGHT NOW Oskaloosa Municipal Airport (KOOA) · 5:35 PM
Clear
40° Clear Feels like 37° · high of 39° near 5 PM
WindE 5 mphno gusts
Humidity66%rising to 100% by morning
Pressure30.31 in →steady
Visibility10 mihaze-free
CloudsClear
UV index—no forecast
Dew point 30° · Dryabout the same for three days
DryComfortableStickyMuggyOppressive
NEXT RAIN
Showers
Friday50% chance · showers
LIKELY AMOUNT—amounts come within 3 days
LAST RAINNov. 60.01 in · 8 dry days
ALERTS & OUTLOOKS
No watches or warnings for Keokuk County
NWS Quad Cities and the Storm Prediction Center · checked 5:45 PM
SUN & MOON
↑ 6:55 AM4:51 PM ↓
9 h 55 m of daylight, 2 minutes less than yesterday
Waxing crescent, 26% lit. Next full moon: Nov. 24.
AIR & POLLEN
69
MODERATEAir quality index · fine particles
Tomorrow: 40, good. No pollen source yet.

The next three days, hour by hour

Sky: clear, cloudy, night Rain likely National Blend of Models
SATURDAY, NOV. 14
SUNDAY, NOV. 15
MONDAY, NOV. 16
TUESDAY, NOV. 17
5p
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11p
2a
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clear night
clear night
clear night
partly cloudy night
mostly cloudy night
partly cloudy day
partly cloudy day
mostly sunny
mostly clear night
mostly clear night
clear night
clear night
clear night
clear day
mostly sunny
mostly sunny
clear night
clear night
clear night
mostly clear night
mostly clear night
mostly sunny
mostly sunny
mostly sunny
TEMPERATURE °F
39°
25°
49°
30°
53°
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CHANCE OF RAIN
50%
WIND, MPH
0
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HOW IT FEELS · DEW POINT
Dry: dew points 25 to 37° More humid: 37° by Tuesday

The next seven days, and how sure we are

Forecast, with the range 8 in 10 ensemble members agree on Normal, about 50° / 30°
SAT Nov. 14 Sunny Sunny
39° 25°
0% rain — E 0 A
SUN Nov. 15 Partly cloudy; warmer Partly cloudy; warmer
54° 29°
0% rain — S 1 A
MON Nov. 16 Mostly sunny Mostly sunny
58° 36°
0% rain — SSW 8 B
TUE Nov. 17 Mostly sunny Mostly sunny
60° 41°
0% rain — SSE 9 A
WED Nov. 18 Partly cloudy Partly cloudy
62° 49°
20% rain — S 13 B
THU Nov. 19 Mostly sunny Mostly sunny
64° 46°
20% rain — W 3 C
FRI Nov. 20 Chance of showers Chance of showers
66° 54°
50% rain up to 0.2″ SSE 10 C
How sure are we? AModels agree: highs within 4° BSome spread: within 8° CWide spread: check back
Range from the National Blend of Models percentiles · graded on Forecast Scores
AIR MAIL

Where today’s air came from

The air arriving over Martinsburg about 5,000 feet above the ground was over the northern Plains three days ago, and over the central Plains a day ago, about 790 miles back along its path. Most of the nine paths traced from around the city agree. It rose from near the ground on the way. Near the ground the air came from the Canadian Prairies; at 10,000 feet, from the Pacific Northwest. It has stayed over land, which is why it feels dry. Traced back 72 hours through NOAA’s hourly RAP analyses, nine paths at each of three heights.

THIS WEEK IN 1959 Nov. 17, 1959

The coldest this week has been

−2° on Nov. 17, 1959, the coldest reading for this week of the year since 1896. Next is −2° in 2019.

−2°
−2°
20191959
Source: NOAA RCC-ACIS, the Sigourney record since 1896.
MILE2
THE GROUND

What Martinsburg stands on

Martinsburg’s center stands about 810 ft above sea level. Within three miles the land runs from 740 ft to 820 ft, a difference of 80 ft: gently rolling country.

Under the town center the state geologic map shows Lower Cherokee Group and Raccoon Creek Group (shale, sandstone, siltstone), from the Early Pennsylvanian to Middle Pennsylvanian, 307 to 324 million years old.

The section below crosses 3 rock units mapped at the surface.

Martinsburg, cut in half from west to east

A section west to east, 24 miles through the town center
700 ft800 ft MARTINSBURG810 ftHigh point of the line850 ftHedrick820 ftSouth Skunk Riverabout 630 ft ← W · KirkvilleE →

Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.

Rock at the surface along the line

Lower Cherokee Group and Raccoon Creek Group

Shale, sandstone, siltstone. Age: Early Pennsylvanian to Middle Pennsylvanian, 307 to 324 million years old. About 11 mi of the line.

St. Louis and Pella Formations

Dolostone, limestone. Age: Middle Mississippian to Late Mississippian, 324 to 347 million years old. About 10 mi of the line.

Augusta Group

Dolostone, limestone. Age: Early Mississippian to Middle Mississippian, 331 to 359 million years old. About 3 mi of the line.

From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.

Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.

MILE3
THE WATER

Where Martinsburg’s rain goes

A raindrop that lands in Martinsburg reaches the Gulf of America by way of Competine Creek, Cedar Creek, the Skunk and the Mississippi: about 1,480 river miles.

THE WAY DOWN, TO SCALE
Martinsburg≈ 1,480 mi · the Gulf of America
FROM THE CENTER OF MARTINSBURG ≈ 1,480 mi to the Gulf of America Competine Creek → Cedar Creek → Skunk → Mississippi

Traced down the USGS NHDPlus V2.1 river network from the Census center point of Martinsburg; river miles along the main stem, rounded.

MILE5
THE ALMANAC

Martinsburg’s year

1991–2020 normals · records since 1896 · Sigourney, 11 mi north

Martinsburg has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 12° in January. About 37 inches of rain fall in a normal year.

30°12°35°15°48°26°61°37°71°49°81°59°85°63°83°60°76°52°63°40°48°28°35°18° JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC 1234 TODAY MARTINSBURG 37.4 in rain a year
Normal high to low, by month Record high to low, by day Rain by month Freezing
July, average85° / 63°high / low, the warmest month
January, average30° / 12°high / low, the coldest month
Rain a year37.4 inwettest months: June and May
Hottest on record113°FJuly 22, 1901
Coldest on record−32°FJanuary 31, 2019
Wettest day on record5.34 inJune 12, 1946
Snowiest day on record14.0 inFebruary 2, 2011
90° days a year14very few reach 100°
Nights at or below 32°142and 51 days that stay below freezing
Climate typeHot-summer humid continentalKöppen Dfa

AROUND THE RING

1Freeze seasonfrom the first fall freeze, about Oct. 17, to the last in spring, about April 22 (median dates)
2Highs below freezingDec. 25 to Feb. 9; normal highs stay below 32°
3Lows below freezingNov. 4 to April 2; normal lows fall below 32°
4Wettest stretchMay through July: 14.0 of the year’s 37.4 inches
NOVEMBER 14 IN THE RECORD

On November 14 Martinsburg normally reaches 49° and falls to 28°. The record high is 77°, in 1999; the record low 2°, in 1959. The most rain on this date, 1.00 in, fell in 1902.

MONTH BY MONTH
JanFebMarAprMayJunJulAugSepOctNovDec
Normal high30°35°48°61°71°81°85°83°76°63°48°35°
Normal low12°15°26°37°49°59°63°60°52°40°28°18°
Rain, inches1.181.472.343.704.955.113.934.763.472.782.181.54
Record high70° (1989)77° (2017)91° (2026)93° (1965)106° (1934)105° (1988)113° (1901)111° (1934)103° (1899)95° (1938)81° (1938)74° (2021)
Record low−32° (2019)−30° (1905)−20° (1962)7° (1982)24° (1907)35° (1916)45° (1972)39° (1915)16° (1913)4° (1925)−9° (1898)−30° (1924)

Normals 1991–2020 and records since 1896 at Sigourney, 11 miles north. NOAA, through RCC-ACIS.

MILE7
ON THE NETWORK

Around Martinsburg on the Forecast Network

Neighboring plates

Ottumwa IA · 14 MI 14 miles southwest Cedar Rapids IA · 62 MI 62 miles northeast Des Moines IA · 76 MI 76 miles west Springfield IL · 167 MI 167 miles southeast Omaha NE · 198 MI 198 miles west
FORECASTCITY
Map of Martinsburg, Iowa. Explore the plate
IOWA · KEOKUK

Martinsburg

109 people, 810 ft above sea level in Keokuk County.

810 ftElevation
109People
0 sq miLand
Clear 40°
ClearDew point 30°
1

Today in Martinsburg

NEXT 15 HOURS
Now clear night 39° 0%
8p mostly clear night 34° 0%
11p clear night 30° 0%
2a mostly clear night 27° 0%
5a partly cloudy night 26° 0%
8a partly cloudy day 28° 0%
Showers
NEXT RAINFriday · 50%
→
Sat0%
Sunny Sunny
25
39
A
Sun0%
Partly cloudy; warmer Partly cloudy; warmer
29
54
A
Mon0%
Mostly sunny Mostly sunny
36
58
B
Tue0%
Mostly sunny Mostly sunny
41
60
A
Wed20%
Partly cloudy Partly cloudy
49
62
B
Thu20%
Mostly sunny Mostly sunny
46
64
C
Fri50%
Chance of showers Chance of showers
54
66
C
Letters show how sure the forecast is: A, models agree; B, some spread; C, check back. Sample data.
THIS WEEK IN 1959 · NOV. 17, 1959

−2°, the coldest this week of the year has been since 1896.

2

What Martinsburg stands on

Martinsburg’s center stands about 810 ft above sea level. Within three miles the land runs from 740 ft to 820 ft, a difference of 80 ft: gently rolling country.

Martinsburg, west to east Martinsburg810 ftHigh point850 ftSouth Skunk Riverabout 630 ft ← WE → 24 miles through the town center; vertical exaggeration about 122×. Colors: rock at the surface.
Elevation, center810 ft
Within 3 miles740 to 820 ft
Lie of the landGently rolling (80 ft of relief)
Rock at the surfaceLower Cherokee Group and Raccoon Creek Group
Its ageEarly Pennsylvanian to Middle Pennsylvanian, 307 to 324 million years old
5

Martinsburg’s year

Martinsburg has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 12° in January. About 37 inches of rain fall in a normal year.

JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC 1234 37.4 in
July, average85° / 63° · high / low, the warmest month
January, average30° / 12° · high / low, the coldest month
Rain a year37.4 in · wettest months: June and May
Hottest on record113°F · July 22, 1901
Coldest on record−32°F · January 31, 2019
Wettest day on record5.34 in · June 12, 1946
Snowiest day on record14.0 in · February 2, 2011
90° days a year14 · very few reach 100°
Nights at or below 32°142 · and 51 days that stay below freezing
Climate typeHot-summer humid continental · Köppen Dfa
1Freeze season · from the first fall freeze, about Oct. 17, to the last in spring, about April 22 (median dates)
2Highs below freezing · Dec. 25 to Feb. 9; normal highs stay below 32°
3Lows below freezing · Nov. 4 to April 2; normal lows fall below 32°
4Wettest stretch · May through July: 14.0 of the year’s 37.4 inches
NOVEMBER 14 IN THE RECORD

On November 14 Martinsburg normally reaches 49° and falls to 28°. The record high is 77°, in 1999; the record low 2°, in 1959. The most rain on this date, 1.00 in, fell in 1902.

Normals 1991–2020 and records since 1896 at Sigourney, 11 miles north. NOAA, through RCC-ACIS.
3

Where the rain goes

≈ 1,480 mito the Gulf of AmericaCompetine Creek → Cedar Creek → Skunk → Mississippi

A raindrop that lands in Martinsburg reaches the Gulf of America by way of Competine Creek, Cedar Creek, the Skunk and the Mississippi: about 1,480 river miles.