December weather forecast
Charleston International Airport, SC

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Weather in December

December witnesses the onset of winter at Charleston International Airport, replete with low temperatures and increased rainfall. The decline in temperature is noticeable, plunging to a chilly 27°F (-2.8°C) during cold nights. The daylight hours decrease further, curtailing outdoor activities and bringing in homebound evenings earlier. With the increase in precipitation, December brings a mix of chilly breezes and rainy afternoons. The combination of cold temperatures and persistent rainfall creates a seamless transition to the subsequent frosty January.

Temperature

As December commences in Charleston International Airport, the average high-temperature shows a reduction, transitioning from a refreshing 57.2°F (14°C) in November to a frosty 46.4°F (8°C). In the month of December, the temperature in Charleston International Airport generally rests at an average low of 26.6°F (-3°C).

Rainfall

In Charleston International Airport, in December, it is raining for 14 days, with typically 3.23" (82mm) of accumulated precipitation. In Charleston International Airport, South Carolina, during the entire year, the rain falls for 151 days and collects up to 41.93" (1065mm) of precipitation.

Daylight

The month with the shortest days in Charleston International Airport is December, with an average of 10h and 0min of daylight.
On the first day of the month, sunrise is at 7:05 am and sunset at 5:13 pm. On the last day of December, sunrise is at 7:22 am and sunset at 5:24 pm EST.

Sunshine

The month with the least sunshine in Charleston International Airport, South Carolina, is December, with an average of 3h of sunshine.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index in Charleston International Airport, South Carolina. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: During December, 2 as the daily maximum UV index converts into the following advice:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
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Frequently asked questions

What is the average December temperature in Charleston International Airport?

In December, the average high-temperature and low-temperature are 46.4°F (8°C) and 26.6°F (-3°C) respectively.

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

In December, in Charleston International Airport, the rain falls for 14 days. Throughout December, 3.23" (82mm) of precipitation is accumulated.

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

December has the shortest days of the year in Charleston International Airport, with an average of 10h and 0min of daylight.

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

In December, the average day length 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 7:05 am and sunset at 5:13 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 5:24 pm EST.

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

The month with the least sunshine in Charleston International Airport is December, with an average of 3h of sunshine.

How many hours of sunshine does Charleston International Airport have in December?

The average sunshine duration in December is 3h.

What are the months 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 in Charleston International Airport, South Carolina.

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

In Charleston International Airport, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to UV radiation.
Average high temperature
Average rainfall days
Average daylight
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 0min

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • 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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Charleston International Airport, South Carolina, USA

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