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Shaded-relief map of West Deer, Pennsylvania: rivers, roads, the city limits and where the water drains.
PENNSYLVANIA · ALLEGHENY COUNTY

West Deer

12,242 people, 1,190 ft above sea level in Allegheny County.

1,190 ftElevation, city center
12,242People, 2024 estimate
29 sq miLand area
Clear 39°
Clear now Dew point 35° · W 13 mph · high 37°
City of West Deer River Interstate 2 miles
Explore the plate Order a print

The West Deer 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 West Deer

NWS forecast and National Blend of Models · updated 6:00 PM EST
RIGHT NOW Pittsburgh/Butler Regional Airport (KBTP) · 5:56 PM
Clear
39° Clear Feels like 31° · high of 37° near 6 PM
WindW 13 mphno gusts
Humidity86%rising to 100% by morning
Pressure30.06 in →steady
Visibility10 mihaze-free
CloudsClear
UV index—no forecast
Dew point 35° · Dryabout the same for three days
DryComfortableStickyMuggyOppressive
NEXT RAIN
Mostly cloudy
Tonight, around midnightin about 5 hours · 36% chance · rain
LIKELY AMOUNT—amounts come within 3 days
LAST RAINNov. 70.05 in · 7 dry days
ALERTS & OUTLOOKS
No watches or warnings for Allegheny County
NWS Pittsburgh and the Storm Prediction Center · checked 6:47 PM
SUN & MOON
↑ 7:04 AM5:03 PM ↓
9 h 58 m of daylight, 2 minutes less than yesterday
Waxing crescent, 26% lit. Next full moon: Nov. 24.
AIR & POLLEN
28
GOODAir quality index · ozone
Tomorrow: 25, 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
6p
9p
Mid
3a
6a
9a
Noon
3p
6p
9p
Mid
3a
6a
9a
Noon
3p
6p
9p
Mid
3a
6a
9a
Noon
3p
mostly cloudy night
mostly cloudy night
rain
rain
mostly cloudy day
mostly cloudy day
mostly cloudy day
mostly cloudy day
partly cloudy night
mostly cloudy night
mostly cloudy night
mostly cloudy night
mostly cloudy day
mostly cloudy day
mostly cloudy day
mostly cloudy day
partly cloudy night
mostly clear night
mostly clear night
mostly clear night
partly cloudy day
mostly sunny
mostly sunny
clear day
TEMPERATURE °F
37°
36°
44°
35°
45°
28°
CHANCE OF RAIN
36% · 0.06 in Sunday overnight 50%
WIND, MPH
12
10
8
7
7
9
10
9
5
0
0
0
0
5
6
6
0
0
0
0
0
3
6
2
HOW IT FEELS · DEW POINT
Dry: dew points 28 to 39°

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
37° 32°
20% rain — W 11 A
SUN Nov. 15 Chance of showers; warmer Chance of showers; warmer
46° 32°
40% rain — NW 9 A
MON Nov. 16 Mostly cloudy Mostly cloudy
48° 25°
0% rain — NW 4 A
TUE Nov. 17 Partly cloudy Partly cloudy
52° 26°
0% rain — SW 5 A
WED Nov. 18 Sunny Sunny
55° 27°
0% rain — S 5 B
THU Nov. 19 Mostly sunny Mostly sunny
58° 36°
0% rain — SSW 5 B
FRI Nov. 20 Mostly sunny Mostly sunny
59° 37°
0% rain — WSW 5 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 West Deer about 5,000 feet above the ground was over Canada three days ago, and over Ontario a day ago, about 2,530 miles back along its path. It came down from about 13,500 feet up, warming and drying as it sank. Near the ground the air came from British Columbia; at 10,000 feet, from the open Pacific. It has stayed over land, which is why it feels dry. Traced back 72 hours through NOAA’s hourly RAP analyses and the GFS beyond them, nine paths at each of three heights.

THIS WEEK, SIX YEARS AGO Nov. 11, 2020

The hottest this week has been

74° on Nov. 11, 2020, the hottest reading for this week of the year since 1905. Next is 70° in 2021.

70°
74°
20212020
Source: NOAA RCC-ACIS, the Acmetonia Lock 3 record since 1905.
MILE2
THE GROUND

What West Deer stands on

West Deer’s center stands about 1,190 ft above sea level. Within three miles the land runs from 920 ft to 1,260 ft, a difference of 340 ft: rolling country.

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

The section below crosses 2 rock units mapped at the surface.

Millvale to Winfield, cut in half

A section southwest to northeast, 24 miles through the town center
750 ft1,000 ft1,250 ft WEST DEER1,190 ftEtna740 ftClinton1,240 ftSaxonburg1,280 ft ← SW · MillvaleWinfield · NE →

Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 30×. 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

Glenshaw Formation

Shale. Age: Carboniferous, 299 to 324 million years old. About 21 mi of the line.

Casselman Formation

Shale, clastic. Age: Carboniferous, 299 to 324 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 West Deer’s rain goes

A raindrop that lands in West Deer reaches the Gulf of America by way of Little Deer Creek, Deer Creek, the Allegheny, the Ohio and the Mississippi: about 1,970 river miles.

THE WAY DOWN, TO SCALE
West Deer≈ 1,970 mi · the Gulf of America
FROM THE CENTER OF WEST DEER ≈ 1,970 mi to the Gulf of America Little Deer Creek → Deer Creek → Allegheny → Ohio → Mississippi

970 miles of the trip are on the Ohio.

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

MILE5
THE ALMANAC

West Deer’s year

1991–2020 normals · records since 1905 · Acmetonia Lock 3, 7 mi south-southeast

West Deer has a hot-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 19° in January. About 44 inches of rain fall in a normal year.

36°19°40°21°49°27°62°38°72°49°79°57°83°62°82°61°75°54°64°43°51°32°42°25° JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC 1 TODAY WEST DEER 44.5 in rain a year
Normal high to low, by month Rain by month Freezing
July, average83° / 62°high / low, the warmest month
January, average36° / 19°high / low, the coldest month
Rain a year44.5 inwettest months: July and June
Hottest on record102°FJune 16, 2022
Coldest on record−14°FFebruary 1, 2026
Wettest day on record6.88 inSeptember 18, 2004
Climate typeHot-summer humid continentalKöppen Dfa

AROUND THE RING

1Lows below freezingNov. 11 to April 1; normal lows fall below 32°
MONTH BY MONTH
JanFebMarAprMayJunJulAugSepOctNovDec
Normal high36°40°49°62°72°79°83°82°75°64°51°42°
Normal low19°21°27°38°49°57°62°61°54°43°32°25°
Rain, inches3.382.873.683.703.914.454.543.564.183.323.263.66

Normals 1991–2020 and records since 1905 at Acmetonia Lock 3, 7 miles south-southeast, 440 ft lower. NOAA, through RCC-ACIS.

MILE7
ON THE NETWORK

Around West Deer on the Forecast Network

Neighboring plates

Pittsburgh PA · 15 MI 15 miles southwest Hempfield PA · 29 MI 29 miles southeast Cleveland OH · 111 MI 111 miles northwest Columbus OH · 170 MI 170 miles west Washington DC · 193 MI 193 miles southeast Baltimore MD · 196 MI 196 miles southeast
FORECASTCITY
Map of West Deer, Pennsylvania. Explore the plate
PENNSYLVANIA · ALLEGHENY

West Deer

12,242 people, 1,190 ft above sea level in Allegheny County.

1,190 ftElevation
12,242People
29 sq miLand
Clear 39°
ClearDew point 35°
1

Today in West Deer

NEXT 15 HOURS
Now mostly cloudy night 37° 0%
9p mostly cloudy night 35° 22%
12a rain 36° 35%
3a rain 36° 36%
6a mostly cloudy night 36° 13%
9a mostly cloudy day 39° 1%
Mostly cloudy
NEXT RAINTonight around midnight · 36%
→
Sat20%
Mostly cloudy Mostly cloudy
32
37
A
Sun40%
Chance of showers; warmer Chance of showers; warmer
32
46
A
Mon0%
Mostly cloudy Mostly cloudy
25
48
A
Tue0%
Partly cloudy Partly cloudy
26
52
A
Wed0%
Sunny Sunny
27
55
B
Thu0%
Mostly sunny Mostly sunny
36
58
B
Fri0%
Mostly sunny Mostly sunny
37
59
C
Letters show how sure the forecast is: A, models agree; B, some spread; C, check back. Sample data.
THIS WEEK, SIX YEARS AGO · NOV. 11, 2020

74°, the hottest this week of the year has been since 1905.

2

What West Deer stands on

West Deer’s center stands about 1,190 ft above sea level. Within three miles the land runs from 920 ft to 1,260 ft, a difference of 340 ft: rolling country.

West Deer, southwest to northeast West Deer1,190 ft ← SWNE → 24 miles through the town center; vertical exaggeration about 57×. Colors: rock at the surface.
Elevation, center1,190 ft
Within 3 miles920 to 1,260 ft
Lie of the landRolling (340 ft of relief)
Rock at the surfaceGlenshaw Formation
Its ageCarboniferous, 299 to 324 million years old
5

West Deer’s year

West Deer has a hot-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 19° in January. About 44 inches of rain fall in a normal year.

JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC 1 44.5 in
July, average83° / 62° · high / low, the warmest month
January, average36° / 19° · high / low, the coldest month
Rain a year44.5 in · wettest months: July and June
Hottest on record102°F · June 16, 2022
Coldest on record−14°F · February 1, 2026
Wettest day on record6.88 in · September 18, 2004
Climate typeHot-summer humid continental · Köppen Dfa
1Lows below freezing · Nov. 11 to April 1; normal lows fall below 32°
Normals 1991–2020 and records since 1905 at Acmetonia Lock 3, 7 miles south-southeast, 440 ft lower. NOAA, through RCC-ACIS.
3

Where the rain goes

≈ 1,970 mito the Gulf of AmericaLittle Deer Creek → Deer Creek → Allegheny → Ohio → Mississippi

A raindrop that lands in West Deer reaches the Gulf of America by way of Little Deer Creek, Deer Creek, the Allegheny, the Ohio and the Mississippi: about 1,970 river miles.

970 miles of the trip are on the Ohio.