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Shaded-relief map of Mount Sterling, Illinois: rivers, roads, the city limits and where the water drains.
ILLINOIS · BROWN COUNTY

Mount Sterling

2,031 people, 740 ft above sea level in Brown County.

740 ftElevation, city center
2,031People, 2024 estimate
1 sq miLand area
Sunny 45°
Sunny now Dew point 25° · Calm · high 44°
City of Mount Sterling River Interstate 2 miles
Explore the plate Order a print

The Mount Sterling 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 Mount Sterling

NWS forecast and National Blend of Models · updated 3:00 PM CST
RIGHT NOW Mount Sterling Municipal Airport (KI63) · 3:35 PM
Sunny
45° Sunny Feels like 45° · high of 44° near 3 PM
WindCalmno gusts
Humidity45%rising to 88% by morning
Pressure30.30 in →steady
Visibility10 mihaze-free
CloudsClear
UV index—no forecast
Dew point 25° · Dry37° by Tuesday: more humid
DryComfortableStickyMuggyOppressive
NEXT RAIN
Clear
Not this weeknone in the forecast for a week
LIKELY AMOUNT—nothing expected
LAST RAINNov. 60.08 in · 8 dry days
ALERTS & OUTLOOKS
No watches or warnings for Brown County
NWS St Louis and the Storm Prediction Center · checked 3:45 PM
SUN & MOON
↑ 6:47 AM4:48 PM ↓
10 h 1 m of daylight, 2 minutes less than yesterday
Waxing crescent, 26% lit. Next full moon: Nov. 24.
AIR & POLLEN
9
GOODAir quality index · fine particles
Tomorrow: None, 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
3p
6p
9p
Mid
3a
6a
9a
Noon
3p
6p
9p
Mid
3a
6a
9a
Noon
3p
6p
9p
Mid
3a
6a
9a
Noon
clear day
clear night
clear night
clear night
mostly clear night
partly cloudy day
partly cloudy day
mostly sunny
mostly sunny
clear night
mostly clear night
mostly clear night
clear night
clear day
clear day
clear day
mostly sunny
clear night
clear night
clear night
mostly clear night
mostly sunny
clear day
clear day
TEMPERATURE °F
44°
26°
50°
29°
53°
34°
CHANCE OF RAIN
50%
WIND, MPH
1
0
0
0
0
0
0
0
0
0
0
0
0
1
2
3
3
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HOW IT FEELS · DEW POINT
Dry: dew points 24 to 28° ↑ Humid air returns More humid: 36° by Tuesday

The next seven days, and how sure we are

Forecast, with the range 8 in 10 ensemble members agree on Normal, about 80° / 62°
SAT Nov. 14 Sunny Sunny
44° 26°
0% rain — NNW 1 A
SUN Nov. 15 Partly cloudy; warmer Partly cloudy; warmer
52° 28°
0% rain — N 0 A
MON Nov. 16 Sunny Sunny
55° 33°
0% rain — SSW 2 A
TUE Nov. 17 Sunny Sunny
57° 36°
0% rain — SSE 6 A
WED Nov. 18 Partly cloudy Partly cloudy
60° 47°
20% rain — SSE 13 B
THU Nov. 19 Partly cloudy Partly cloudy
64° 47°
20% rain — WSW 3 C
FRI Nov. 20 Partly cloudy Partly cloudy
66° 52°
20% rain — SSE 9 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 Mount Sterling about 5,000 feet above the ground was over the open Pacific three days ago, and over the central Plains a day ago, about 2,630 miles back along its path. It came down from about 12,400 feet up, warming and drying as it sank. Near the ground the air came from British Columbia; at 10,000 feet, from the Pacific Northwest. It feels dry all the same. Traced back 72 hours through NOAA’s hourly RAP analyses and the GFS beyond them, nine paths at each of three heights.

THIS WEEK IN 2009 Nov. 16–17, 2009

The wettest two days this week has seen

4.38 inches of rain fell in two days, the most for this week of the year since records began in 1992. The next wettest, 3.15 inches, fell in 2015.

3.15″
4.38″
20152009
Source: NOAA RCC-ACIS, the Perry 6 NW record since 1992.
MILE2
THE GROUND

What Mount Sterling stands on

Mount Sterling’s center stands about 740 ft above sea level. Within three miles the land runs from 610 ft to 740 ft, a difference of 130 ft: gently rolling country.

Under the town center the state geologic map shows Carbondale Formation (shale, sandstone, coal), from the Middle Pennsylvanian to Late Pennsylvanian, 304 to 315 million years old.

The section below crosses 4 rock units mapped at the surface.

Mount Sterling, cut in half from northwest to southeast

A section northwest to southeast, 24 miles through the town center
500 ft600 ft700 ft MOUNT STERLING740 ftHigh point of the line790 ftLow point440 ft ← NW · ClaytonSE →

Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 54×. 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

Carbondale Formation

Shale, sandstone, coal. Age: Middle Pennsylvanian to Late Pennsylvanian, 304 to 315 million years old. About 19 mi of the line.

Warsaw Formation and Salem Limestone

Limestone. Age: Middle Mississippian, 331 to 347 million years old. About 4 mi of the line.

Tradewater Formation

Shale, sandstone. Age: Early Pennsylvanian to Middle Pennsylvanian, 307 to 324 million years old. About 0.8 mi of the line.

Meppen Limestone, Fern Glen Formation, and Burlington-Keokuk Limestone

Limestone. Age: Early Mississippian to Middle Mississippian, 331 to 359 million years old. About 0.6 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 Mount Sterling’s rain goes

A raindrop that lands in Mount Sterling reaches the Gulf of America by way of West Creek, the La Moine, the Illinois and the Mississippi: about 1,300 river miles.

THE WAY DOWN, TO SCALE
Mount Sterling≈ 1,300 mi · the Gulf of America
FROM THE CENTER OF MOUNT STERLING ≈ 1,300 mi to the Gulf of America West Creek → La Moine → Illinois → Mississippi

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

MILE5
THE ALMANAC

Mount Sterling’s year

1991–2020 normals · records since 1992 · Perry 6 NW, 13 mi south-southwest

Mount Sterling has a hot-summer humid continental climate. Summer afternoons average 87° in July; winter nights fall to about 18° in January. A normal year brings about 21 inches of snow; with the rain, that comes to about 39 inches of water.

36°18°42°22°53°31°65°42°75°53°84°62°87°65°86°63°80°54°67°43°53°33°41°23° JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC 123 TODAY 39.1 in rain and snowmelt
Normal high to low, by month Rain by month Freezing
July, average87° / 65°high / low, the warmest month
January, average36° / 18°high / low, the coldest month
Rain and melted snow39.1 inwettest months: June and July
Snow a year20.9 insnowiest: January
Hottest on record106°FJuly 24, 2012
Coldest on record−26°FJanuary 5, 1999
Wettest day on record5.14 inSeptember 10, 2014
90° days a year31about 1 of them 100° or more
Nights at or below 32°123and 30 days that stay below freezing
Climate typeHot-summer humid continentalKöppen Dfa

AROUND THE RING

1Freeze seasonfrom the first fall freeze, about Oct. 10, to the last in spring, about April 19 (median dates)
2Lows below freezingNov. 17 to March 19; normal lows fall below 32°
3Wettest stretchMay through July: 13.6 of the year’s 39.1 inches
MONTH BY MONTH
JanFebMarAprMayJunJulAugSepOctNovDec
Normal high36°42°53°65°75°84°87°86°80°67°53°41°
Normal low18°22°31°42°53°62°65°63°54°43°33°23°
Rain and melt, in1.962.002.573.924.414.754.483.213.593.102.822.26
Snow, inches6.16.02.40.40.00.00.00.00.00.00.95.1

Normals 1991–2020 and records since 1992 at Perry 6 NW, 13 miles south-southwest. NOAA, through RCC-ACIS.

MILE7
ON THE NETWORK

Around Mount Sterling on the Forecast Network

Neighboring plates

Quincy IL · 33 MI 33 miles west Jacksonville IL · 33 MI 33 miles southeast St. Louis MO · 97 MI 97 miles south Columbia MO · 110 MI 110 miles southwest Cedar Rapids IA · 145 MI 145 miles north Des Moines IA · 185 MI 185 miles northwest
FORECASTCITY
Map of Mount Sterling, Illinois. Explore the plate
ILLINOIS · BROWN

Mount Sterling

2,031 people, 740 ft above sea level in Brown County.

740 ftElevation
2,031People
1 sq miLand
Sunny 45°
SunnyDew point 25°
1

Today in Mount Sterling

NEXT 15 HOURS
Now clear day 44° 0%
6p clear night 38° 0%
9p clear night 32° 0%
12a clear night 30° 0%
3a mostly clear night 28° 0%
6a partly cloudy night 27° 0%
Clear
NEXT RAINNone this week
→
Sat0%
Sunny Sunny
26
44
A
Sun0%
Partly cloudy; warmer Partly cloudy; warmer
28
52
A
Mon0%
Sunny Sunny
33
55
A
Tue0%
Sunny Sunny
36
57
A
Wed20%
Partly cloudy Partly cloudy
47
60
B
Thu20%
Partly cloudy Partly cloudy
47
64
C
Fri20%
Partly cloudy Partly cloudy
52
66
C
Letters show how sure the forecast is: A, models agree; B, some spread; C, check back. Sample data.
THIS WEEK IN 2009 · NOV. 16–17, 2009

4.38 inches in two days, the most for this week since 1992.

2

What Mount Sterling stands on

Mount Sterling’s center stands about 740 ft above sea level. Within three miles the land runs from 610 ft to 740 ft, a difference of 130 ft: gently rolling country.

Mount Sterling, northwest to southeast Mount Sterling740 ft ← NWSE → 24 miles through the town center; vertical exaggeration about 104×. Colors: rock at the surface.
Elevation, center740 ft
Within 3 miles610 to 740 ft
Lie of the landGently rolling (130 ft of relief)
Rock at the surfaceCarbondale Formation
Its ageMiddle Pennsylvanian to Late Pennsylvanian, 304 to 315 million years old
5

Mount Sterling’s year

Mount Sterling has a hot-summer humid continental climate. Summer afternoons average 87° in July; winter nights fall to about 18° in January. A normal year brings about 21 inches of snow; with the rain, that comes to about 39 inches of water.

JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC 123 39.1 in
July, average87° / 65° · high / low, the warmest month
January, average36° / 18° · high / low, the coldest month
Rain and melted snow39.1 in · wettest months: June and July
Snow a year20.9 in · snowiest: January
Hottest on record106°F · July 24, 2012
Coldest on record−26°F · January 5, 1999
Wettest day on record5.14 in · September 10, 2014
90° days a year31 · about 1 of them 100° or more
Nights at or below 32°123 · and 30 days that stay below freezing
Climate typeHot-summer humid continental · Köppen Dfa
1Freeze season · from the first fall freeze, about Oct. 10, to the last in spring, about April 19 (median dates)
2Lows below freezing · Nov. 17 to March 19; normal lows fall below 32°
3Wettest stretch · May through July: 13.6 of the year’s 39.1 inches
Normals 1991–2020 and records since 1992 at Perry 6 NW, 13 miles south-southwest. NOAA, through RCC-ACIS.
3

Where the rain goes

≈ 1,300 mito the Gulf of AmericaWest Creek → La Moine → Illinois → Mississippi

A raindrop that lands in Mount Sterling reaches the Gulf of America by way of West Creek, the La Moine, the Illinois and the Mississippi: about 1,300 river miles.