December weather forecastHilton Head Island, SC

Tall iconic lighthouse seen in a great night view over downtown Hilton Head Island, South Carolina

December

Weather in December

December marks the arrival of the winter season on Hilton Head Island, with a significant decrease in temperature compared to November. Despite being a winter month, December offers fairly mild weather suitable for exploring the splendid landscapes of the island. Vigorous winds, coupled with chilly nights, attest to the winter season's presence. The weather remains clear and nippy, a contrast to the fairly warm November days. Unveiling the lowest temperatures of the year, December records the mercury plummeting between 61.5°F (16.4°C) and 50.9°F (10.5°C), rounding up a climatically diverse year on Hilton Head Island.

Temperature

Hilton Head Island, South Carolina, greets December with an average high-temperature of a still comfortable 61.5°F (16.4°C), marking a slight deviation from the preceding month. In the month of December, the temperature in Hilton Head Island generally rests at an average low of 50.9°F (10.5°C).

Humidity

With an average relative humidity of 77%, December is the most humid month in Hilton Head Island.

Rainfall

In Hilton Head Island, South Carolina, during December, the rain falls for 11.5 days and regularly aggregates up to 2.32" (59mm) of precipitation. In Hilton Head Island, South Carolina, during the entire year, the rain falls for 175.3 days and collects up to 32.28" (820mm) of precipitation.

Snowfall

In Hilton Head Island, snow does not fall in February through December.

Ocean temperature

In Hilton Head Island, South Carolina, in December, the average water temperature is 61.5°F (16.4°C).
Note: Swimming in 61.5°F (16.4°C) does not offer a pleasant experience for most individuals. The act of controlling one's breathing becomes progressively difficult as the water temperature goes under 69.8°F (21°C).

Daylight

The month with the shortest days is December, with an average of 10h and 6min of daylight.
On the first day of December, sunrise is at 7:06 am and sunset at 5:17 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 5:28 pm EST.

Sunshine

With an average of 5.7h of sunshine, December has the least sunshine of the year in Hilton Head Island.

UV index

In Hilton Head Island, the average daily maximum UV index in December is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the average person.
Note: In December, a daily maximum UV index of 4 leads to the following instructions:
Undertake precautions - Obligation exists to protect against skin and eye damage. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.

Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The high-temperature during December is 61.5°F (16.4°C) and the low-temperature is 50.9°F (10.5°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in September is appraised at 89.6°F (32°C).

The most humid month in Hilton Head Island is December, with an average relative humidity of 77%.

In December, the average relative humidity in Hilton Head Island is 77%.

In Hilton Head Island, during December, the rain falls for 11.5 days and regularly aggregates up to 2.32" (59mm) of precipitation.

In Hilton Head Island, South Carolina, snow does not fall in February through December.

In Hilton Head Island, South Carolina, in December, it doesn't snow. In January, it regularly snows.

In Hilton Head Island, South Carolina, the average seawater temperature in December is 61.5°F (16.4°C). For swimming, a surface water temperature of 61.5°F (16.4°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

December has the shortest days of the year, with an average of 10h and 6min of daylight.

In Hilton Head Island, South Carolina, the average day length in December is 10h and 5min.

On the first day of December in Hilton Head Island, South Carolina, sunrise is at 7:06 am and sunset at 5:17 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 5:28 pm EST.

The month with the least sunshine in Hilton Head Island is December, with an average of 5.7h of sunshine.

The average sunshine duration in December in Hilton Head Island, South Carolina, is 5.7h.

In December, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A S O N December

Nov

December

Jan

Average high temperature

66.4°F

61.5°F

57.4°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

10.1mph

10.2mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

0.1

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

17.9

17.2

20.3

Average UV index

Average cloud cover

Average visibility

Average temperature in December
Hilton Head Island, SC

Average high temperature in December: 61.5°F

The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is January (57.4°F).

Average low temperature in December: 50.9°F

The month with the highest average low temperature is July (77.9°F).
The coldest month (with the lowest average low temperature) is January (46°F).

Average pressure in December
Hilton Head Island, SC

Average pressure in December: 30.13"Hg

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

Average wind speed in December
Hilton Head Island, SC

Average wind speed in December: 9.4mph

The windiest months (with the highest average wind speed) are January, March and April (9.6mph).
The calmest month (with the lowest average wind speed) is August (7.8mph).

Average humidity in December
Hilton Head Island, SC

Average humidity in December: 77%

The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is January (72%).

Average rainfall in December
Hilton Head Island, SC

Average rainfall in December: 2.32"

The wettest month (with the highest rainfall) is August (6.06").
The driest month (with the least rainfall) is January (1.02").

Average rainfall days in December
Hilton Head Island, SC

Average rainfall days in December: 11.5 days

The month with the highest number of rainy days is August (25 days).
The month with the least rainy days is January (8.3 days).

Average snowfall in December
Hilton Head Island, SC

Average snowfall in December: 0"

The month with the highest snowfall is January (0.04").
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").

Average snowfall days in December
Hilton Head Island, SC

Average snowfall days in December: 0 days

The months with the highest number of snowfall days are January and February (0.1 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).

Average sea temperature in December
Hilton Head Island, SC

Average sea temperature in December: 61.5°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 (57.5°F).

Average daylight in December /
Average sunshine in December
Hilton Head Island, SC

Average daylight in December: 10h and 6min

The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).

Average sunshine in December: 5h and 42min

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

Average sunshine days in December
Hilton Head Island, SC

Average sunshine days in December: 17.2 days

The month with the most sunshine days is January (20.3 days).
The month with the least sunshine days is August (2.8 days).

Average UV index in December
Hilton Head Island, 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).

Average cloud cover in December
Hilton Head Island, SC

Average cloud cover in December: 38

The months with the most cloud cover are February and December (Cloud cover 38).
The months with the least cloud cover are June and July (Cloud cover 25).

Average visibility in December
Hilton Head Island, 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).