December weather forecast
Seabrook Island, SC

December

Weather in December

The first month of the winter, December, is still a refreshing month in Seabrook Island, South Carolina, with an average temperature varying between 15.9°C and 8.9°C.

Temperature

A subtle shift in Seabrook Island's weather is observed as November turns into December, with the average high temperature reducing from a comfortable 19°C to a still refreshing 15.9°C. Throughout December, Seabrook Island registers a consistent average low-temperature of 8.9°C.

Humidity

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

Rainfall

In Seabrook Island, in December, during 7.5 rainfall days, 29mm of precipitation is typically accumulated. Throughout the year, there are 118.7 rainfall days, and 270mm of precipitation is accumulated.

Snowfall

January and December are months with snowfall. The months with the most snowfall days are January and December, with an average of 0.1 snowfall days.

Daylight

December has the shortest days of the year, with an average of 10h and 6min of daylight.
On the first day of December, sunrise is at 7:05 am and sunset at 5:14 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 5:25 pm EST.

Sunshine

The month with the least sunshine is December, with an average of 5.7h of sunshine.

UV index

The average daily maximum UV index in December is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: The daily high UV index of 4 during December translates into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Enhance your sun protection with tightly woven, yet airy clothing. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.

Frequently asked questions

What is the usual temperature for Seabrook Island in December?
In Seabrook Island, 15.9°C is the average high-temperature and 8.9°C is the average low-temperature during December. In September, the average heat index (a.k.a. 'real feel', 'feels like'), which combines air temperature and relative humidity, is calculated to be 35°C.
What is the most humid month?
December is the most humid month, with an average relative humidity of 77%.
What is the average humidity in December?
The average relative humidity in December is 77%.
How much does it rain in December?
In Seabrook Island, during December, the rain falls for 7.5 days and regularly aggregates up to 29mm of precipitation.
What is the snowiest month?
The months with the most snowfall days are January and December, with an average of 0.1 snowfall days.
When does it start to snow?
December is the first month it typically snows. Throughout December, there are 0.1 snowfall days.
What is the month with the shortest days?
December has the shortest days of the year in Seabrook Island, with an average of 10h and 6min of daylight.
How many hours of daylight does Seabrook Island have in December?
In Seabrook Island, the average day length in December is 10h and 3min.
What time are sunrise and sunset in December in Seabrook Island?
On the first day of December, sunrise is at 7:05 am and sunset at 5:14 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 5:25 pm EST.
What is the month with the least sunshine?
December has the least sunshine of the year, with an average of 5.7h of sunshine.
How long on average sun shines in December?
In December, the average sunshine duration is 5.7h.
What is the UV index intensity in December?
The average daily maximum UV index in December in Seabrook Island is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to the Sun's UV radiation.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility
Average temperature in December - Seabrook Island, SC
Average temperature in December
Seabrook Island, SC
  • Average high temperature in December: 15.9°C

The warmest month (with the highest average high temperature) is July (32.1°C).
The month with the lowest average high temperature is January (14°C).

  • Average low temperature in December: 8.9°C

The month with the highest average low temperature is July (24.7°C).
The coldest month (with the lowest average low temperature) is January (6.2°C).

Average pressure in December - Seabrook Island, SC
Average pressure in December
Seabrook Island, SC
  • Average pressure in December: 1020.2mbar

The month with the highest atmospheric pressure is January (1020.5mbar).
The month with the lowest atmospheric pressure is June (1015.1mbar).

Average wind speed in December - Seabrook Island, SC
Average wind speed in December
Seabrook Island, SC
  • Average wind speed in December: 12km/h

The windiest month (with the highest average wind speed) is April (13.1km/h).
The calmest month (with the lowest average wind speed) is August (10.1km/h).

Average humidity in December - Seabrook Island, SC
Average humidity in December
Seabrook Island, SC
  • Average humidity in December: 77%

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

Average rainfall in December - Seabrook Island, SC
Average rainfall in December
Seabrook Island, SC
  • Average rainfall in December: 29mm

The wettest month (with the highest rainfall) is August (44mm).
The driest month (with the least rainfall) is January (8mm).

Average rainfall days in December - Seabrook Island, SC
Average rainfall days in December
Seabrook Island, SC
  • Average rainfall days in December: 7.5 days

The month with the highest number of rainy days is August (16.9 days).
The month with the least rainy days is November (5.7 days).

Average snowfall days in December - Seabrook Island, SC
Average snowfall days in December
Seabrook Island, SC
  • Average snowfall days in December: 0.1 days

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

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

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 6min).

  • Average sunshine in December: 5h and 4min

The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).

Average sunshine days in December - Seabrook Island, SC
Average sunshine days in December
Seabrook Island, SC
  • Average sunshine days in December: 21.7 days

The month with the most sunshine days is January (23.3 days).
The month with the least sunshine days is August (9.6 days).

Average UV index in December - Seabrook Island, SC
Average UV index in December
Seabrook 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 - Seabrook Island, SC
Average cloud cover in December
Seabrook Island, SC
  • Average cloud cover in December: 39

The months with the most cloud cover are February and December (Cloud cover 39).
The months with the least cloud cover are June and July (Cloud cover 25).

Average visibility in December - Seabrook Island, SC
Average visibility in December
Seabrook Island, SC
  • Average visibility in December: 9km

The months with the highest visibility are February, March, June, July, August, September, October and November (10km).
The months with the lowest visibility are January, April, May and December (9km).

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