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Shaded-relief map of St. Clair, Pennsylvania: rivers, roads, the city limits and where the water drains.
PENNSYLVANIA · SCHUYLKILL COUNTY

St. Clair

2,763 people, 750 ft above sea level in Schuylkill County.

750 ftElevation, city center
2,763People, 2024 estimate
1 sq miLand area
Clear 37°
Clear now Dew point 32° · WNW 9 mph · high 40°
City of St. Clair River Interstate 2 miles
Explore the plate Order a print

The St. Clair 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 St. Clair

NWS forecast and National Blend of Models · updated 6:00 PM EST
RIGHT NOW Schuylkill County/Joe Zerbey Airport (KZER) · 6:55 PM
Clear
37° Clear Feels like 31° · high of 40° near 7 PM
WindWNW 9 mphno gusts
Humidity81%rising to 92% by morning
Pressure29.89 in →steady
Visibility7 mihazy
CloudsClear
UV index—no forecast
Dew point 32° · Dryabout the same for three days
DryComfortableStickyMuggyOppressive
NEXT RAIN
Clear
Not this weeknone in the forecast for a week
LIKELY AMOUNT—nothing expected
LAST RAINNov. 60.15 in · 8 dry days
ALERTS & OUTLOOKS
No watches or warnings for Schuylkill County
NWS State College and the Storm Prediction Center · checked 7:21 PM
SUN & MOON
↑ 6:50 AM4:48 PM ↓
9 h 57 m of daylight, 2 minutes less than yesterday
Waxing crescent, 27% lit. Next full moon: Nov. 24.
AIR & POLLEN
20
GOODAir quality index · ozone
Tomorrow: 15, 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
7p
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mostly cloudy night
partly cloudy night
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partly cloudy night
partly cloudy day
partly cloudy day
mostly cloudy day
partly cloudy night
partly cloudy night
partly cloudy night
partly cloudy night
partly cloudy night
partly cloudy day
partly cloudy day
partly cloudy day
partly cloudy night
clear night
clear night
mostly clear night
mostly clear night
mostly sunny
mostly sunny
mostly sunny
mostly clear night
TEMPERATURE °F
40°
34°
46°
34°
48°
30°
CHANCE OF RAIN
50%
WIND, MPH
6
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HOW IT FEELS · DEW POINT
Dry: dew points 30 to 36° ↑ 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 Mostly cloudy Mostly cloudy
40° 33°
10% rain — WNW 6 A
SUN Nov. 15 Partly cloudy Partly cloudy
46° 32°
0% rain — NNW 7 A
MON Nov. 16 Partly cloudy Partly cloudy
50° 30°
0% rain — NNW 6 B
TUE Nov. 17 Sunny Sunny
54° 32°
0% rain — WNW 1 A
WED Nov. 18 Sunny Sunny
57° 34°
0% rain — W 5 B
THU Nov. 19 Mostly sunny Mostly sunny
59° 38°
0% rain — SW 5 B
FRI Nov. 20 Mostly sunny Mostly sunny
60° 39°
0% rain — WNW 5 B
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 St. Clair about 5,000 feet above the ground was over the Canadian Prairies three days ago, and over the Great Lakes a day ago, about 2,290 miles back along its path. Near the ground the air came from British Columbia; at 10,000 feet, from the Gulf of Alaska. 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.

MILE2
THE GROUND

What St. Clair stands on

St. Clair’s center stands about 750 ft above sea level. Within three miles the land runs from 640 ft to 1,660 ft, a difference of 1,020 ft: steep hill country. The highest named summit within 15 miles is Bears Head, about 2,090 ft, 11 miles north-northeast.

Under the town center the state geologic map shows Llewellyn Formation (sandstone), from the Carboniferous, 299 to 324 million years old.

The section below crosses 9 rock units mapped at the surface.

Washington to East Union, cut in half

A section southwest to northeast, 24 miles through the town center
500 ft1,000 ft1,500 ft ST. CLAIR750 ftLow point640 ftPottsville850 ftMahanoy City1,230 ftHigh point of the line1,940 ft ← SW · WashingtonEast Union · NE →

Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 15×. 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

Llewellyn Formation

Sandstone. Age: Carboniferous, 299 to 324 million years old. About 7 mi of the line.

Pottsville Formation

Sandstone. Age: Carboniferous, 299 to 324 million years old. About 6 mi of the line.

Mauch Chunk Formation

Shale, siltstone, sandstone. Age: Carboniferous, 324 to 359 million years old. About 5 mi of the line.

Sherman Creek Member of Catskill Formation

Siltstone, mudstone. Age: Late Devonian, 359 to 384 million years old. About 2 mi of the line.

Long Run Member of Catskill Formation

Sandstone, siltstone, mudstone. Age: Late Devonian, 359 to 384 million years old. About 2 mi of the line.

Hamilton Group

Black-shale. Age: Early Devonian to Middle Devonian, 384 to 422 million years old. About 1 mi of the line.

From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 3 smaller units along the line are not listed.

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 St. Clair’s rain goes

A raindrop that lands in St. Clair reaches Delaware Bay and the Atlantic Ocean by way of Mill Creek, the Schuylkill and the Delaware: about 180 river miles.

THE WAY DOWN, TO SCALE
St. Clair≈ 180 mi · Delaware Bay and the Atlantic Ocean
FROM THE CENTER OF ST. CLAIR ≈ 180 mi to Delaware Bay and the Atlantic Ocean Mill Creek → Schuylkill → Delaware

120 miles of the trip are on the Schuylkill.

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

MILE7
ON THE NETWORK

Around St. Clair on the Forecast Network

Neighboring plates

Reading PA · 30 MI 30 miles southeast Allentown PA · 38 MI 38 miles east Philadelphia PA · 74 MI 74 miles southeast Baltimore MD · 101 MI 101 miles south New York NY · 118 MI 118 miles east Washington DC · 133 MI 133 miles south
FORECASTCITY
Map of St. Clair, Pennsylvania. Explore the plate
PENNSYLVANIA · SCHUYLKILL

St. Clair

2,763 people, 750 ft above sea level in Schuylkill County.

750 ftElevation
2,763People
1 sq miLand
Clear 37°
ClearDew point 32°
1

Today in St. Clair

NEXT 15 HOURS
Now mostly cloudy night 40° 5%
10p mostly cloudy night 38° 6%
1a partly cloudy night 37° 1%
4a partly cloudy night 35° 0%
7a mostly sunny 34° 0%
10a partly cloudy day 43° 1%
Clear
NEXT RAINNone this week
→
Sat10%
Mostly cloudy Mostly cloudy
33
40
A
Sun0%
Partly cloudy Partly cloudy
32
46
A
Mon0%
Partly cloudy Partly cloudy
30
50
B
Tue0%
Sunny Sunny
32
54
A
Wed0%
Sunny Sunny
34
57
B
Thu0%
Mostly sunny Mostly sunny
38
59
B
Fri0%
Mostly sunny Mostly sunny
39
60
B
Letters show how sure the forecast is: A, models agree; B, some spread; C, check back. Sample data.
2

What St. Clair stands on

St. Clair’s center stands about 750 ft above sea level. Within three miles the land runs from 640 ft to 1,660 ft, a difference of 1,020 ft: steep hill country. The highest named summit within 15 miles is Bears Head, about 2,090 ft, 11 miles north-northeast.

St. Clair, southwest to northeast St. Clair750 ft ← SWNE → 24 miles through the town center; vertical exaggeration about 28×. Colors: rock at the surface.
Elevation, center750 ft
Within 3 miles640 to 1,660 ft
Lie of the landSteep hill country (1,020 ft of relief)
High point nearbyBears Head, 2,090 ft, 11 mi north-northeast
Rock at the surfaceLlewellyn Formation
Its ageCarboniferous, 299 to 324 million years old
3

Where the rain goes

≈ 180 mito the AtlanticMill Creek → Schuylkill → Delaware

A raindrop that lands in St. Clair reaches Delaware Bay and the Atlantic Ocean by way of Mill Creek, the Schuylkill and the Delaware: about 180 river miles.

120 miles of the trip are on the Schuylkill.