December weather forecast
Hilton Head Island, SC

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

The first month of the winter, December, is also an enjoyable month in Hilton Head Island, South Carolina, with temperature in the range of an average low of 50.9°F (10.5°C) and an average high of 61.5°F (16.4°C).

Temperature

In Hilton Head Island, South Carolina, the average high-temperature in December is practically the same as in November - a still enjoyable 61.5°F (16.4°C). In Hilton Head Island, in December, the average low-temperature is 50.9°F (10.5°C).

Humidity

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

Rainfall

In Hilton Head Island, South Carolina, it is raining for 11.5 days, with typically 2.32" (59mm) of accumulated precipitation. In Hilton Head Island, during the entire year, the rain falls for 175.3 days and collects up to 32.28" (820mm) of precipitation.

Snowfall

February through December are months without snowfall in Hilton Head Island.

Ocean temperature

In Hilton Head Island, South Carolina, the average seawater temperature in December is 61.5°F (16.4°C).
Note: 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).

Daylight

December has the shortest days of the year, with an average of 10h and 5min 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

December has the least sunshine of the year, with an average of 5.7h of sunshine.

UV index

In Hilton Head Island, the average daily maximum UV index in December is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 4 in December interpret into the following advice:
Take precautions - Protection against skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in December in Hilton Head Island?

In Hilton Head Island, in December, the average high-temperature is 61.5°F (16.4°C), and the average low-temperature is 50.9°F (10.5°C). in September, the average heat index (a.k.a. 'feels like', 'real feel'), which calculates the temperature value influenced by the moisture in the air, is evaluated at 89.6°F (32°C).

What is the most humid month in Hilton Head Island?

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

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

The average relative humidity in December in Hilton Head Island, South Carolina, is 77%.

How many days does it rain in December in Hilton Head Island?

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, 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, in December, the average water temperature 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?

The month with the shortest days in Hilton Head Island, South Carolina, is December, with an average of 10h and 5min of daylight.

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

In Hilton Head Island, 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 many hours of sunshine does Hilton Head Island have in December?

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

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

The average daily maximum UV index in December is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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 5min

The month with the longest days is June (Average daylight: 14h and 14min).
The month with the shortest days is December (Average daylight: 10h and 5min).

  • 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).

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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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