Carlisle weather in December

In December, Carlisle sees average daytime highs of 42°F and overnight lows near 29°F, with 3.4 in of precipitation across 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 21% 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 Carlisle's 11th-clearest and 5th-windiest month. For the whole year in context, see Carlisle's year-round climate.

Daytime high
42°
10th warmest
Overnight low
29°
3rd coldest
Precipitation
3.4 in
9 wet days
Daylight
9 h 12 min
7:30 AM – 4:39 PM
Cloud cover
67%
11th clearest
Wind
7 mph
5th windiest
Solar energy
1.72 kWh/m²
Travel score
0.3
out of 10

Carlisle is borough in Cumberland County, Pennsylvania, United States.

Density
1,334/km²
people per km²
Founded
1751

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 Carlisle reaches about 42°F in the afternoon and slips back to 29°F overnight — a 12°F spread between the day's warmth and the night's chill. On most days the high lands between 30°F and 54°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)
14633
24633
34532
44532
54432
64431
74431
84331
94331
104330
114230
124230
134229
144229
154129
164129
174129
184129
194128
204128
214028
224028
234028
244028
254028
264027
274027
284027
294027
303927
313927

How December really feels in Carlisle

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.

Carlisle 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
Jan38° / 24°3.29.24.59.50.0
Feb40° / 25°2.894.410.40.2
Mar50° / 33°3.910.73.311.72.1
Apr62° / 43°3.711.20.3135.0
May71° / 53°3.812.7014.26.1
Jun80° / 62°3.711.6014.86.2
Jul84° / 67°3.910.8014.65.3
Aug82° / 65°3.410.6013.66.0
Sep76° / 58°4.49.3012.36.9
Oct64° / 46°3.48.30.210.95.8
Nov52° / 37°3.18.50.89.82.8
Dec42° / 29°3.4939.20.3

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 14% of December, with mostly cloudy or overcast conditions the remaining 64%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13862
23664
33565
43565
53565
63565
73466
83466
93466
103367
113367
123466
133466
143565
153565
163664
173664
183664
193763
203664
213763
223763
233763
243763
253763
263763
273664
283664
293664
303664
313565

Chance of precipitation in December

Any precipitationSnow

Carlisle gets around 3.4 in of rain and snow over 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 30% and peaks near 31% on the wettest days, and about 3 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1317
2318
3318
4319
5319
63110
73110
83111
93111
103111
113111
123011
133011
143011
153011
163011
173010
183010
192910
202910
21299
22289
23289
24289
25289
26279
27279
28289
29289
30289
312810

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 99% 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
14991
15991
16991
17991
18991
19991
20991
21991
22991
23991
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 7 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
257calm
267calm
277calm
287calm
297calm
307calm
317calm

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 7:18 AM to 7:37 AM, and sunset from 4:39 PM to 4:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.37:184:39
29.37:194:39
39.37:204:39
49.37:214:38
59.37:224:38
69.37:234:38
79.27:244:38
89.27:244:38
99.27:254:38
109.27:264:38
119.27:274:38
129.27:284:39
139.27:284:39
149.27:294:39
159.27:304:39
169.27:304:39
179.17:314:40
189.17:324:40
199.17:324:40
209.17:334:41
219.17:334:41
229.17:344:42
239.17:344:42
249.17:354:43
259.17:354:43
269.17:354:44
279.17:364:44
289.27:364:45
299.27:364:46
309.27:364:46
319.27:374:47

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.72 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.72 kWh/m² to a high of 6.05 kWh/m² in June across the year — December's 1.72 kWh/m² sits near the bottom.

00.511.522.5151015202531
Solar energy (kWh/m²)Level
11.8Dim
21.8Dim
31.8Dim
41.8Dim
51.8Dim
61.7Dim
71.7Dim
81.7Dim
91.7Dim
101.7Dim
111.7Dim
121.7Dim
131.7Dim
141.7Dim
151.7Dim
161.7Dim
171.7Dim
181.7Dim
191.7Dim
201.7Dim
211.7Dim
221.7Dim
231.7Dim
241.7Dim
251.7Dim
261.8Dim
271.8Dim
281.8Dim
291.8Dim
301.8Dim
311.8Dim
Planning a trip in December

Is December a good time to visit Carlisle?

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

0.3
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 Carlisle.

What to pack for Carlisle in December

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

In December, Carlisle sees daytime highs around 42°F and nights near 29°F. Pack a warm layer. Worth having: a heavy coat and rain gear. About 9 days see rain.

a warm layera heavy coatrain gear

UV index in Carlisle in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 1. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Carlisle peaks around June 22 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 1 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJun 22UV 9Dec 20UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug6High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Carlisle 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 Carlisle is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (November, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1316 µg/m³Nov 118 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar12Moderate
Apr13Moderate
May14Moderate
Jun16Moderate
Jul17Moderate
Aug14Moderate
Sep11Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Carlisle?

Carlisle sits at 40.2°N, 77.2°W, 479 ft above sea level, in United States. The nearest listed city is Harrisburg, 17 mi away.

Topography around Carlisle

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

Within 2 miles, the terrain around Carlisle has only modest variations in elevation — a maximum elevation change of 180 ft around an average of 482 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,699 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,438 ft.

The land around Carlisle is covered by trees (37%), grassland (27%) and artificial surfaces (27%) within 2 miles, trees (50%), cropland (24%) and grassland (21%) within 10 miles, and trees (60%) and cropland (21%) within 50 miles.

2 miles
180 ft
10 miles
1,699 ft
50 miles
2,438 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Harrisburg 17 mi · York 29 mi · Hanover 30 mi · Chambersburg 31 mi · Lebanon 42 mi · Westminster 45 mi · Hagerstown 48 mi · Lancaster 48 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 Carlisle (40.2015°, -77.1889°, elevation 479 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).