McKeesport weather in December

In December, McKeesport sees average daytime highs of 42°F and overnight lows near 29°F, with 3.6 in of precipitation across 11.9 wet days and about 9.2 hours of daylight. It is the 10th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 45°F in the first days to 40°F by the end. The sky is clear or mostly clear about 13% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 18 min at the start of December to 9 h 12 min by month's end. Set against the rest of the year, December is McKeesport's 11th-clearest and 3rd-windiest month. For the whole year in context, see McKeesport's year-round climate.

Daytime high
42°
10th warmest
Overnight low
29°
3rd coldest
Precipitation
3.6 in
11.9 wet days
Daylight
9 h 06 min
7:42 AM – 4:50 PM
Cloud cover
76%
11th clearest
Wind
7 mph
3rd windiest
Solar energy
1.52 kWh/m²
Travel score
0.2
out of 10

McKeesport is city in Allegheny County, Pennsylvania, United States.

Density
1,388/km²
people per km²
Founded
1891

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 45°F in the first days to 40°F by the end.

A typical December day in McKeesport reaches about 42°F in the afternoon and slips back to 29°F overnight — a 13°F spread between the day's warmth and the night's chill. On most days the high lands between 28°F and 56°F. Set against its neighbours, December runs about 10°F cooler than November and about 4°F warmer than January.

20°40°60°151015202531
Avg high (°F)Avg low (°F)
14632
24532
34531
44431
54431
64430
74330
84330
94230
104229
114229
124229
134229
144129
154128
164128
174128
184128
194028
204028
214028
224027
234027
244027
254027
264027
274027
284027
294026
303926
313926

How December really feels in McKeesport

Once humidity and wind are folded in, December averages 0 days that feel above 90°F and 31 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
31
wind chill below the day's low

The story in December is cold — wind chill drags the overnight "feels like" below the raw low.

McKeesport weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan37° / 24°3.612.77.29.50.0
Feb40° / 25°3.211.45.810.40.1
Mar50° / 32°4.413.43.711.72.0
Apr62° / 43°4.514.21134.6
May71° / 52°4.914.3014.25.8
Jun79° / 60°5.014014.86.0
Jul82° / 64°4.914.5014.65.7
Aug81° / 63°3.711.8013.66.2
Sep75° / 56°3.810012.36.8
Oct63° / 45°3.610.60.210.95.4
Nov51° / 36°3.510.21.39.82.5
Dec42° / 29°3.611.94.79.20.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 11% of December, with mostly cloudy or overcast conditions the remaining 76%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12674
22575
32575
42476
52377
62377
72377
82476
92476
102377
112377
122377
132377
142377
152575
162575
172575
182575
192575
202575
212674
222575
232674
242674
252575
262575
272575
282575
292476
302476
312476

Chance of precipitation in December

Any precipitationSnow

McKeesport gets around 3.6 in of rain and snow over 11.9 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 38% and peaks near 41% on the wettest days, and about 5 days bring snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
13911
24012
34012
44013
54014
64114
74115
84115
94116
104016
114016
124016
133916
143916
153816
163816
173816
183716
193716
203615
213615
223615
233615
243614
253614
263614
273614
283715
293715
303815
313916

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1991
2991
3991
4991
5991
6991
7991
8991
9991
10991
11991
12991
13991
141000
151000
161000
171000
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
281000
291000
301000
311000

Wind in December

Winds average 7 mph in December.

Across December, daily wind ranges from about 7 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257light breeze
267light breeze
277light breeze
288light breeze
298light breeze
308light breeze
318light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 18 min at the start of December to 9 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 7:29 AM to 7:48 AM, and sunset from 4:49 PM to 4:57 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.37:294:49
29.37:304:49
39.37:314:49
49.37:324:49
59.37:334:49
69.27:344:49
79.27:354:49
89.27:364:49
99.27:364:49
109.27:374:49
119.27:384:49
129.27:394:49
139.27:394:49
149.27:404:49
159.17:414:49
169.17:424:50
179.17:424:50
189.17:434:50
199.17:434:51
209.17:444:51
219.17:444:52
229.17:454:52
239.17:454:52
249.17:464:53
259.17:464:54
269.17:474:54
279.17:474:55
289.17:474:55
299.17:474:56
309.27:484:57
319.27:484:57

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.52 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.52 kWh/m² to a high of 5.93 kWh/m² in June across the year — December's 1.52 kWh/m² sits near the bottom.

00.511.522.5151015202531
Solar energy (kWh/m²)Level
11.6Dim
21.6Dim
31.6Dim
41.6Dim
51.6Dim
61.6Dim
71.5Dim
81.5Dim
91.5Dim
101.5Dim
111.5Dim
121.5Dim
131.5Dim
141.5Dim
151.5Dim
161.5Dim
171.5Dim
181.5Dim
191.5Dim
201.5Dim
211.5Dim
221.5Dim
231.5Dim
241.5Dim
251.5Dim
261.5Dim
271.5Dim
281.6Dim
291.6Dim
301.6Dim
311.6Dim
Planning a trip in December

Is December a good time to visit McKeesport?

Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

0.2
Sightseeing
10th-best month of the year
0.0
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in McKeesport.

What to pack for McKeesport in December

From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In December, McKeesport sees daytime highs around 42°F and nights near 29°F. Pack a warm layer and a heavy coat. Worth having: rain gear. About 12 days see rain.

a warm layera heavy coatrain gear

UV index in McKeesport in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in McKeesport peaks around June 22 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 22UV 9Dec 22UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug7Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low

Air quality in McKeesport in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.

Air quality in McKeesport is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (November, 8 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1317 µg/m³Nov 148 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb10Good
Mar11Good
Apr12Good
May15Moderate
Jun16Moderate
Jul17Moderate
Aug15Moderate
Sep12Good
Oct8Good
Nov8Good
Dec8Good
Location & terrain

Where is McKeesport?

McKeesport sits at 40.3°N, 79.9°W, 764 ft above sea level, in United States. The nearest listed city is West Mifflin, 1.2 mi away.

Topography around McKeesport

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of McKeesport.

Within 2 miles, the terrain around McKeesport has only modest variations in elevation — a maximum elevation change of 531 ft around an average of 935 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 699 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,346 ft.

The land around McKeesport is covered by trees (48%) and artificial surfaces (34%) within 2 miles, trees (65%) within 10 miles, and trees (76%) within 50 miles.

2 miles
531 ft
10 miles
699 ft
50 miles
2,346 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: West Mifflin 1.2 mi · Baldwin 6.2 mi · Monroeville 6.2 mi · Wilkinsburg 6.8 mi · Bethel Park 9.3 mi · Pittsburgh 9.3 mi · Mount Lebanon 9.9 mi · Murrysville 11 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for McKeesport (40.3479°, -79.8642°, elevation 764 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).