December weather forecast
Hilton Head Island, SC

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

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.
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Frequently asked questions

What is the average December temperature in Hilton Head Island?

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).

What is the most humid month in Hilton Head Island?

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

What is the average humidity in December in Hilton Head Island?

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

How much does it rain in Hilton Head Island in December?

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

When it does not snow in Hilton Head Island?

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

Does it snow in Hilton Head Island in December?

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

What is the ocean temperature in December in Hilton Head Island?

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).

What is the month with the shortest days in Hilton Head Island?

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

What is the average length of the day in December in Hilton Head Island?

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

When is the sunrise / sunset in December in Hilton Head Island?

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.

What is the month with the least sunshine in Hilton Head Island?

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

How long on average sun shines in December in Hilton Head Island?

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

What is the UV index intensity in December in Hilton Head Island?

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
YearJFMAMJJASONDecember
Nov
December
Jan
Average high temperature
66.4°F 19.1°C
61.5°F 16.4°C
57.4°F 14.1°C
Average low temperature
55.2°F 12.9°C
50.9°F 10.5°C
46°F 7.8°C
Average pressure
30.12" 765mmHg
30.13" 765mmHg
30.14" 766mmHg
Average wind speed
9.4mph 15.1km/h
9.4mph 15.1km/h
9.6mph 15.4km/h
Average max. wind speed
10.1mph 16.3km/h
10.1mph 16.3km/h
10.2mph 16.4km/h
Average wind speed gusts
14.5mph 23.3km/h
14.7mph 23.7km/h
14.9mph 24km/h
Average humidity
73%
77%
72%
Average rainfall
1.42" 36mm
2.32" 59mm
1.02" 26mm
Average rainfall days
8.8
11.5
8.3
Average snowfall
0" 0mm
0" 0mm
0.04" 1mm
Average snowfall days
0
0
0.1
Average sea temperature
69.2°F 20.7°C
61.5°F 16.4°C
57.9°F 14.4°C
Average daylight
10h 3min
10h 1min
10h 2min
Average sunshine
6h 1min
5h 4min
5h 5min
Average sunshine days
17.9
17.2
20.3
Average UV index
5
4
3
Average cloud cover
31%
38%
33%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in December
Hilton Head Island, SC

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).

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Average pressure in December
Hilton Head Island, SC

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).

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Average wind speed in December
Hilton Head Island, SC

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).

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Average humidity in December
Hilton Head Island, SC

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%).

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Average rainfall in December
Hilton Head Island, SC

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").

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Average rainfall days in December
Hilton Head Island, SC

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).

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Average snowfall in December
Hilton Head Island, SC

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").

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Average snowfall days in December
Hilton Head Island, SC

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).

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Average sea temperature in December
Hilton Head Island, SC

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).

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

Average daylight in December / Average sunshine in December - Hilton Head Island, SC
  • Average daylight in December: 10h and 1min

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 4min

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).

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Average sunshine days in December
Hilton Head Island, SC

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).

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Average UV index in December
Hilton Head Island, SC

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).

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Average cloud cover in December
Hilton Head Island, SC

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).

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Average visibility in December
Hilton Head Island, SC

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).

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Hilton Head Island, South Carolina, USA

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