Mount Pleasant weather in December

In December, Mount Pleasant sees average daytime highs of 61°F and overnight lows near 52°F, with 4.0 in of rain across 9.6 wet days and about 9.9 hours of daylight. It is the 10th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 63°F in the first days to 59°F by the end. The sky is clear or mostly clear about 39% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 hours at the start of December to 9 h 54 min by month's end. Set against the rest of the year, December is Mount Pleasant's 6th-clearest and 4th-windiest month. For the whole year in context, see Mount Pleasant's year-round climate.

Daytime high
61°
10th warmest
Overnight low
52°
3rd coldest
Rainfall
4.0 in
9.6 wet days
Daylight
9 h 54 min
7:20 AM – 5:11 PM
Cloud cover
54%
6th clearest
Wind
12 mph
4th windiest
Solar energy
2.61 kWh/m²
Travel score
5.2
out of 10

Mount Pleasant is town in Charleston County, South Carolina, United States.

Density
696/km²
people per km²
Founded
1680

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 63°F in the first days to 59°F by the end.

A typical December day in Mount Pleasant reaches about 61°F in the afternoon and slips back to 52°F overnight — a 9°F spread between the day's warmth and the night's chill. On most days the high lands between 50°F and 69°F. Set against its neighbours, December runs about 5°F cooler than November and about 3°F warmer than January.

30°40°50°60°70°80°151015202531
Avg high (°F)Avg low (°F)
16354
26354
36354
46354
56253
66253
76253
86253
96253
106252
116152
126152
136152
146152
156152
166151
176151
186051
196051
206051
216051
226051
236051
246051
256051
265950
275950
285950
295950
305950
315950

How December really feels in Mount Pleasant

Once humidity and wind are folded in, December averages 0 days that feel above 90°F and 0 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
0
wind chill below the day's low

December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Mount Pleasant weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan58° / 49°3.79.610.14.5
Feb59° / 50°3.8910.84.7
Mar63° / 55°3.58.311.86.0
Apr69° / 62°3.0712.87.0
May75° / 69°2.58.213.77.3
Jun81° / 76°4.613.914.15.9
Jul84° / 78°4.91513.95.0
Aug83° / 78°6.518.213.24.8
Sep80° / 74°6.114.212.26.0
Oct74° / 66°4.58.611.27.3
Nov66° / 57°3.07.510.36.6
Dec61° / 52°4.09.69.95.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 13% of December, with mostly cloudy or overcast conditions the remaining 48%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15842
25743
35743
45644
55545
65446
75347
85347
95248
105248
115248
125248
135248
145248
155248
165248
175248
185248
195248
205149
215149
225149
235050
244951
254951
264951
274951
284951
294951
304951
314951

Chance of precipitation in December

Any precipitation

Mount Pleasant gets around 4.0 in of rain over 9.6 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 31% and peaks near 33% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
127
227
328
428
529
629
730
831
931
1032
1132
1232
1333
1433
1533
1633
1733
1833
1933
2033
2132
2232
2332
2432
2531
2631
2731
2831
2930
3030
3129

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 68% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
16215167
26315157
36315157
46315157
56316156
66316156
76316156
86416155
96516145
106516145
116616144
126616144
136616144
146815134
156815134
166915133
176915133
186915133
197014133
207114123
217114123
227114123
237114123
247213123
257213123
267114123
277114123
287213123
297213123
307113133
317113133

Wind in December

Winds average 12 mph in December.

Across December, daily wind ranges from about 11 mph on the calmest days to 12 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
111light breeze
211light breeze
311light breeze
411light breeze
511light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze
3112light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 hours at the start of December to 9 h 54 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 7:09 AM to 7:27 AM, and sunset from 5:09 PM to 5:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.07:095:09
210.07:105:09
310.07:115:09
410.07:125:09
59.97:135:09
69.97:135:09
79.97:145:09
89.97:155:09
99.97:155:09
109.97:165:10
119.97:175:10
129.97:185:10
139.97:185:10
149.97:195:11
159.97:195:11
169.97:205:11
179.87:215:11
189.87:215:12
199.87:225:12
209.87:225:13
219.87:235:13
229.87:235:14
239.87:245:14
249.87:245:15
259.87:255:15
269.87:255:16
279.87:255:16
289.97:265:17
299.97:265:17
309.97:265:18
319.97:275:19

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.61 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.61 kWh/m² to a high of 6.54 kWh/m² in May across the year — December's 2.61 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.8Moderate
22.8Moderate
32.8Moderate
42.8Moderate
52.7Moderate
62.7Moderate
72.7Moderate
82.7Moderate
92.6Moderate
102.6Moderate
112.6Moderate
122.6Moderate
132.6Moderate
142.6Moderate
152.6Moderate
162.6Moderate
172.6Moderate
182.6Moderate
192.6Moderate
202.6Moderate
212.6Moderate
222.6Moderate
232.6Moderate
242.6Moderate
252.6Moderate
262.6Moderate
272.6Moderate
282.6Moderate
292.6Moderate
302.6Moderate
312.6Moderate
Planning a trip in December

Hazard calendar for Mount Pleasant

In seasonPeak

None of Mount Pleasant's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Mount Pleasant sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Mount Pleasant?

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

5.2
Sightseeing
8th-best month of the year
0.7
Beach & pool
10th-best month of the year

December is a reasonable time to visit Mount Pleasant for sightseeing.

What to pack for Mount Pleasant in December

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

In December, Mount Pleasant sees daytime highs around 61°F and nights near 52°F. Worth packing: a warm layer and rain gear. About 10 days see rain.

a warm layerrain gear

Sea temperature near Mount Pleasant in December

The nearest coast averages about 64°F in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 12 mi away) is warmest in August at about 83°F and coldest in February near 60°F.

It's comfortable for a long swim from Apr 25 to Nov 19 — about 6.9 months when the water holds above 68°F.

60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan61Cool
Feb60Cool
Mar61Cool
Apr66Cool
May73Refreshing
Jun80Warm
Jul83Tropical
Aug83Tropical
Sep81Warm
Oct75Warm
Nov68Refreshing
Dec64Cool

UV index in Mount Pleasant in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 3. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Mount Pleasant peaks around July 13 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJul 13UV 10Dec 19UV 3
UV index (midday)Level
Jan4Moderate
Feb5Moderate
Mar7High
Apr7Very high
May8Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep8Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Mount Pleasant 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 Mount Pleasant is worst in March — around 21 µg/m³ PM2.5 (moderate), about 3.5× the cleanest month (December, 6 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodModerateGoodMar 1719 µg/m³Dec 136 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb12Moderate
Mar21Moderate
Apr12Moderate
May11Good
Jun14Moderate
Jul16Moderate
Aug14Moderate
Sep9Good
Oct6Good
Nov7Good
Dec6Good
Location & terrain

Where is Mount Pleasant?

Mount Pleasant sits at 32.8°N, 79.9°W, 10 ft above sea level, in United States. The nearest listed city is Charleston, 4.3 mi away.

Topography around Mount Pleasant

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

Within 2 miles, the terrain around Mount Pleasant has only modest variations in elevation — a maximum elevation change of 66 ft around an average of 16 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 131 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 226 ft.

The land around Mount Pleasant is covered by trees (42%), water (20%) and wetland (20%) within 2 miles, water (44%) and trees (27%) within 10 miles, and trees (50%) and water (38%) within 50 miles.

2 miles
66 ft
10 miles
131 ft
50 miles
226 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
December weather nearby: Charleston 4.3 mi · North Charleston 7.5 mi · Hanahan 12 mi · Goose Creek 16 mi · Summerville 24 mi · Hilton Head 65 mi · Hilton Head Island 66 mi · Bluffton 70 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 Mount Pleasant (32.7941°, -79.8626°, elevation 10 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).