December weather forecast
Charleston International Airport, SC

Weather in December

The first month of the winter, December, is also a frosty month in Charleston International Airport, South Carolina, with an average temperature fluctuating between 26.6°F (-3°C) and 46.4°F (8°C).

Temperature

In December, the average high-temperature drops from a mild 57.2°F (14°C) in November to a frosty 46.4°F (8°C). In December, the average low-temperature is 26.6°F (-3°C).

Rainfall

In December, in Charleston International Airport, the rain falls for 14 days. Throughout December, 3.23" (82mm) of precipitation is accumulated. Throughout the year, there are 151 rainfall days, and 41.93" (1065mm) of precipitation is accumulated.

Daylight

The month with the shortest days 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, sunrise is at 7:22 am and sunset at 5:23 pm EST.

Sunshine

December has the least sunshine of the year in Charleston International Airport, with an average of 3h of sunshine.

UV index

The months with the lowest UV index are January and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for average individuals.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

How many days does it rain in December in Charleston International Airport?

In Charleston International Airport, during December, the rain falls for 14 days and regularly aggregates up to 3.23" (82mm) of precipitation.

What is the month with the shortest days in Charleston International Airport?

December has the shortest days of the year, with an average of 10h and 2min of daylight.

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

The average day length in December in Charleston International Airport is 10h and 2min.

What time are sunrise and sunset in December in Charleston International Airport?

On the first day of December in Charleston International Airport, South Carolina, sunrise is at 7:04 am and sunset at 5:13 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 5:23 pm EST.

What is the month with the least sunshine in Charleston International Airport?

With an average of 3h of sunshine, December has the least sunshine of the year.

How long on average sun shines in December in Charleston International Airport?

The average sunshine duration in December in Charleston International Airport, South Carolina, is 3h.

What is the month with the lowest UV index in Charleston International Airport?

January and December, with an average maximum UV index of 2, are months with the lowest UV index.

How high is the UV index in December in Charleston International Airport?

In Charleston International Airport, South Carolina, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation.
Average high temperature
Average rainfall days
Average sunshine
Average UV index

Average temperature in December
Charleston International Airport, SC

Average temperature in December - Charleston International Airport, SC
  • Average high temperature in December: 46°F

The warmest month (with the highest average high temperature) is July (86°F).
The month with the lowest average high temperature is January (41°F).

  • Average low temperature in December: 27°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (23°F).

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Average rainfall in December
Charleston International Airport, SC

Average rainfall in December - Charleston International Airport, SC
  • Average rainfall in December: 3.2"

The wettest month (with the highest rainfall) is July (4.8").
The driest month (with the least rainfall) is October (2.8").

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Average rainfall days in December
Charleston International Airport, SC

Average rainfall days in December - Charleston International Airport, SC
  • Average rainfall days in December: 14 days

The month with the highest number of rainy days is January (15 days).
The months with the least rainy days are September and October (10 days).

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

Average daylight in December / Average sunshine in December - Charleston International Airport, 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: 3h

The months with the most sunshine are May, June, July and August (Average sunshine: 8h).
The month with the least sunshine is December (Average sunshine: 3h).

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Average UV index in December
Charleston International Airport, SC

Average UV index in December - Charleston International Airport, SC
  • Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 9).
The months with the lowest UV index are January and December (UV index 2).

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