December weather forecast
Charleston, SC

Trees along both sides of a street in Charleston, South Carolina
Trees along both sides of a street in Charleston, South Carolina

Weather in December

The first month of the winter, December, is still a comfortable month in Charleston, South Carolina, with an average temperature fluctuating between 60.8°F (16°C) and 49.3°F (9.6°C).

Temperature

In Charleston, the average high-temperature in December is practically the same as in November - a still comfortable 60.8°F (16°C). In December, the average low-temperature is 49.3°F (9.6°C).

Humidity

With an average relative humidity of 78%, December is the most humid month.

Rainfall

In Charleston, it is raining for 11.1 days, with typically 4.25" (108mm) of accumulated precipitation. Throughout the year, in Charleston, there are 178.9 rainfall days, and 41.93" (1065mm) of precipitation is accumulated.

Snowfall

January and December are months with snowfall. December is the first month it typically snows. Throughout December, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. In Charleston, during the entire year, snow falls for 0.6 days and aggregates up to 0.16" (4mm) of snow.

Ocean temperature

In Charleston, the average seawater temperature in December is 66.2°F (19°C).
Note: Swimming in 66.2°F (19°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

Daylight

The month with the shortest days in Charleston is December, with an average of 10h and 2min of daylight.
On the first day of the month, sunrise is at 7:04 am and sunset at 5:13 pm. On the last day of December, in Charleston, sunrise is at 7:21 am and sunset at 5:23 pm EST.

Sunshine

The month with the least sunshine is December, with an average of 5.7h of sunshine.

UV index

The average daily maximum UV index in December is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.
Note: In December, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the most humid month in Charleston?

The most humid month is December, with an average relative humidity of 78%.

What is the average humidity in December in Charleston?

The average relative humidity in December in Charleston, South Carolina, is 78%.

How much does it rain in Charleston in December?

In December, in Charleston, the rain falls for 11.1 days. Throughout December, 4.25" (108mm) of precipitation is accumulated.

When does it start snowing in Charleston?

December is the first month it typically snows. Throughout December, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow.

How cold is the water in December in Charleston?

In Charleston, South Carolina, in December, the average water temperature is 66.2°F (19°C). For most, swimming in 66.2°F (19°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

What is the month with the shortest days in Charleston?

The month with the shortest days in Charleston is December, with an average of 10h and 2min of daylight.

What is the average length of the day in December in Charleston?

In Charleston, South Carolina, the average day length in December is 10h and 2min.

What time are sunrise and sunset in December in Charleston?

On the first day of December, sunrise is at 7:04 am and sunset at 5:13 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 5:23 pm EST.

What is the month with the least sunshine in Charleston?

With an average of 5.7h of sunshine, December has the least sunshine of the year in Charleston, South Carolina.

How long on average sun shines in December in Charleston?

The average sunshine duration in December is 5.7h.

What is the UV index reading in December in Charleston?

In December, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Charleston, SC

Average temperature in December - Charleston, SC
  • Average high temperature in December: 60.8°F

The warmest month (with the highest average high temperature) is July (88.2°F).
The month with the lowest average high temperature is January (57°F).

  • Average low temperature in December: 49.3°F

The month with the highest average low temperature is July (77.4°F).
The coldest month (with the lowest average low temperature) is January (44.4°F).

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Average pressure in December
Charleston, SC

Average pressure in December - Charleston, SC
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).

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Average wind speed in December
Charleston, SC

Average wind speed in December - Charleston, SC
  • Average wind speed in December: 8.7mph

The windiest month (with the highest average wind speed) is April (9.4mph).
The calmest month (with the lowest average wind speed) is August (7.5mph).

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Average humidity in December
Charleston, SC

Average humidity in December - Charleston, SC
  • Average humidity in December: 78%

The month with the highest relative humidity is December (78%).
The months with the lowest relative humidity are January and March (73%).

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Average rainfall in December
Charleston, SC

Average rainfall in December - Charleston, SC
  • Average rainfall in December: 4.25"

The wettest month (with the highest rainfall) is August (7.13").
The driest month (with the least rainfall) is January (1.42").

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Average rainfall days in December
Charleston, SC

Average rainfall days in December - Charleston, SC
  • Average rainfall days in December: 11.1 days

The month with the highest number of rainy days is August (24.8 days).
The month with the least rainy days is November (8.7 days).

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Average snowfall in December
Charleston, SC

Average snowfall in December - Charleston, SC
  • Average snowfall in December: 0.04"

The month with the highest snowfall is January (0.12").
The months with the least snowfall are February, March, April, May, June, July, August, September, October and November (0").

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Average snowfall days in December
Charleston, SC

Average snowfall days in December - Charleston, SC
  • Average snowfall days in December: 0.1 days

The month with the highest number of snowfall days is January (0.4 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).

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Average sea temperature in December
Charleston, SC

Average sea temperature in December - Charleston, SC
  • Average sea temperature in December: 66.3°F

The best month for swimming (with the highest average sea temperature) is August (83.5°F).
The coldest month (with the lowest average sea temperature) is February (61.9°F).

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Average daylight in December /
Average sunshine in December
Charleston, SC

Average daylight in December / Average sunshine in December - Charleston, SC
  • Average daylight in December: 10h and 2min

The month with the longest days is June (Average daylight: 14h and 17min).
The month with the shortest days is December (Average daylight: 10h and 2min).

  • Average sunshine in December: 5h and 42min

The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).

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Average sunshine days in December
Charleston, SC

Average sunshine days in December - Charleston, SC
  • Average sunshine days in December: 17.8 days

The month with the most sunshine days is January (19.3 days).
The month with the least sunshine days is August (3.8 days).

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Average UV index in December
Charleston, SC

Average UV index in December - Charleston, SC
  • Average UV index in December: 4

The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 3).

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Average cloud cover in December
Charleston, SC

Average cloud cover in December - Charleston, SC
  • Average cloud cover in December: 39

The months with the most cloud cover are February and December (Cloud cover 39).
The months with the least cloud cover are June and July (Cloud cover 26).

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Average visibility in December
Charleston, SC

Average visibility in December - Charleston, SC
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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