December weather forecast and climate
Charleston, SC

Trees along both sides of a street in Charleston, South Carolina, seen in the twilight light
Trees along both sides of a street in Charleston, South Carolina, seen in the twilight light

What is the temperature in December in Charleston?

The average high-temperature, in December, in Charleston, South Carolina, is 61.5°F (16.4°C), while the average low-temperature is 40.1°F (4.5°C).

How many days does it rain in December in Charleston?

In Charleston, South Carolina, in December, it is raining for 8.7 days, with typically 3.1" (79mm) of accumulated precipitation.

When does it start snowing in Charleston?

December is the first month it typically snows in Charleston, South Carolina. Throughout December, in the average 0.2 snowfall days, it receives 0.5" (12.7mm) of snow.

What is the snowiest month in Charleston?

The month with the most snowfall in Charleston, South Carolina, is December when snow falls for 0.2 days and typically aggregates up to 0.5" (12.7mm) of snow.
Average temperature in December - Charleston, SC
  • Average high temperature in December: 16.4°C

The warmest month (with the highest average high temperature) is July (32.8°C).
The month with the lowest average high temperature is January (15°C).

  • Average low temperature in December: 4.5°C

The month with the highest average low temperature is July (22.8°C).
The coldest month (with the lowest average low temperature) is January (3.1°C).

Average humidity in December - Charleston, SC
  • Average humidity in December: 71.6%

The month with the highest relative humidity is August (78.9%).
The month with the lowest relative humidity is February (67.4%).

Average rainfall in December - Charleston, SC
  • Average rainfall in December: 79mm

The wettest month (with the highest rainfall) is August (181.6mm).
The driest month (with the lowest rainfall) is November (61.7mm).

Average rainfall days in December - Charleston, SC
  • Average rainfall days in December: 8.7 days

The month with the highest number of rainy days is August (13.2 days).
The month with the lowest number of rainy days is November (7 days).

Average snowfall in December - Charleston, SC
  • Average snowfall in December: 12.7mm

The month with the highest snowfall is December (12.7mm).
Months with the lowest snowfall are January, March, April, May, June, July, August, September, October and November (0mm).

Average snowfall days in December - Charleston, SC
  • Average snowfall days in December: 0.2 days

Months with the highest number of snowfall days are February and December (0.2 days).
Months with the lowest number of snowfall days are March, April, May, June, July, August, September, October and November (0 days).

Average sea temperature in December - Charleston, SC
  • Average sea temperature in December: 19°C

The best month for swimming (with the highest average sea temperature) is August (28.6°C).
The coldest month (with the lowest average sea temperature) is February (16.7°C).

Average daylight in December / Average sunshine in December - Charleston, SC
  • Average daylight in December: 10h

The month with the longest days is June (Average daylight: 14.3h).
The month with shortest days is December (Average daylight: 10h).

  • Average sunshine in December: 5.5h

The month with most sunshine is May (Average sunshine: 9.5h).
The month with least sunshine is December (Average sunshine: 5.5h).

Average UV index in December - Charleston, SC
  • Average UV index in December: 3

Months with the highest UV index are June, July and August (UV index 10).
Months with the lowest UV index are January and December (UV index 3).

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