December weather forecast
Charleston International Airport, SC

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

The decrease of average high-temperatures is mild in December in Charleston International Airport, with a decline from a moderate 57.2°F (14°C) in November to a chilly 46.4°F (8°C). During the month of December, Charleston International Airport's nighttime temperature lowers to an average 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. Throughout the year, there are 151 rainfall days, and 41.93" (1065mm) of precipitation is accumulated.

Daylight

With an average of 10h and 0min of daylight, December has the shortest days of the year.
On the first day of December, 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.

Sunshine

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

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 threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: During December, 2 as the daily maximum UV index converts into the following advice:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.