December weather forecast
South Sumter, SC

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Weather in December

December, the first month of the winter in South Sumter, is also a moderate month, with an average temperature fluctuating between 42.3°F (5.7°C) and 56.3°F (13.5°C).

Temperature

December's arrival coincides with a soft drop in the average high-temperature, subtly decreasing from November's enjoyable 62.4°F (16.9°C) to a moderate 56.3°F (13.5°C). Throughout December, the nighttime temperature in South Sumter, South Carolina, averages to a wintry 42.3°F (5.7°C).

Humidity

The average relative humidity in December in South Sumter is 74%.

Rainfall

The month with the most rainfall in South Sumter is December, when the rain falls for 11 days and typically aggregates up to 3.58" (91mm) of precipitation.

Snowfall

January through March, November and December are months with snowfall in South Sumter, South Carolina. In December, in South Sumter, it is snowing for 0.1 days. Throughout December, 0.16" (4mm) of snow is accumulated. In South Sumter, during the entire year, snow falls for 1.3 days and aggregates up to 1.06" (27mm) of snow.

Daylight

December has the shortest days of the year in South Sumter, with an average of 9h and 54min of daylight.
On the first day of December, sunrise is at 7:08 am and sunset at 5:12 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 5:22 pm EST.

Sunshine

The month with the least sunshine is December, with an average of 5.3h of sunshine.

UV index

January, February and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, a daily UV index of 3 turns into the following recommendations:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
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Frequently asked questions

What is the usual temperature for South Sumter in December?

The high-temperature, in December, in South Sumter, records 56.3°F (13.5°C), while the low-temperature is 42.3°F (5.7°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in September is estimated at 91.4°F (33°C).

What is the average humidity in December in South Sumter?

In South Sumter, South Carolina, the average relative humidity in December is 74%.

What is the rainiest month in South Sumter?

December is the month with the most rainfall in South Sumter. Rain falls for 11 days and accumulates 3.58" (91mm) of precipitation.

How many days does it rain in December in South Sumter?

In South Sumter, in December, it is raining for 11 days, with typically 3.58" (91mm) of accumulated precipitation.

How many days does it snow in December in South Sumter?

In South Sumter, South Carolina, during December, snow falls for 0.1 days and regularly aggregates up to 0.16" (4mm) of snow.

What is the month with the shortest days in South Sumter?

December has the shortest days of the year in South Sumter, with an average of 9h and 54min of daylight.

How many hours of daylight does South Sumter have in December?

In December, the average day length in South Sumter is 9h and 56min.

When are sunrise and sunset in December in South Sumter?

On the first day of December, sunrise is at 7:08 am and sunset at 5:12 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 5:22 pm EST.

What is the month with the least sunshine in South Sumter?

With an average of 5.3h of sunshine, December has the least sunshine of the year.

How long on average sun shines in December in South Sumter?

The average sunshine duration in December in South Sumter, South Carolina, is 5.3h.

When is the lowest UV index in South Sumter?

The months with the lowest UV index in South Sumter are January, February and December, with an average maximum UV index of 3.

What is the UV index reading in December in South Sumter?

The average daily maximum UV index in December in South Sumter, South Carolina, is 3. A UV Index reading of 3 to 5 represents a medium health risk from unprotected exposure to UV radiation.
Average humidity
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
South Sumter, SC

Average temperature in December - South Sumter, SC
  • Average high temperature in December: 56.3°F

The warmest month (with the highest average high temperature) is July (90.7°F).
The month with the lowest average high temperature is January (52.9°F).

  • Average low temperature in December: 42.3°F

The month with the highest average low temperature is July (72.9°F).
The coldest month (with the lowest average low temperature) is January (38.1°F).

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Average pressure in December
South Sumter, SC

Average pressure in December - South Sumter, SC
  • Average pressure in December: 30.14"Hg

The months with the highest atmospheric pressure are January, November and December (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).

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Average wind speed in December
South Sumter, SC

Average wind speed in December - South Sumter, SC
  • Average wind speed in December: 7.5mph

The windiest months (with the highest average wind speed) are February and April (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

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Average humidity in December
South Sumter, SC

Average humidity in December - South Sumter, SC
  • Average humidity in December: 74%

The month with the highest relative humidity is May (76%).
The months with the lowest relative humidity are January and November (70%).

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Average rainfall in December
South Sumter, SC

Average rainfall in December - South Sumter, SC
  • Average rainfall in December: 3.58"

The wettest month (with the highest rainfall) is December (3.58").
The driest month (with the least rainfall) is January (1.89").

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Average rainfall days in December
South Sumter, SC

Average rainfall days in December - South Sumter, SC
  • Average rainfall days in December: 11 days

The month with the highest number of rainy days is July (20.1 days).
The month with the least rainy days is October (8.5 days).

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Average snowfall in December
South Sumter, SC

Average snowfall in December - South Sumter, SC
  • Average snowfall in December: 0.16"

The month with the highest snowfall is February (0.55").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in December
South Sumter, SC

Average snowfall days in December - South Sumter, SC
  • Average snowfall days in December: 0.1 days

The month with the highest number of snowfall days is February (0.6 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
South Sumter, SC

Average daylight in December / Average sunshine in December - South Sumter, SC
  • Average daylight in December: 9h and 5min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in December: 5h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).

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Average sunshine days in December
South Sumter, SC

Average sunshine days in December - South Sumter, SC
  • Average sunshine days in December: 18.8 days

The month with the most sunshine days is October (20.8 days).
The month with the least sunshine days is July (8.8 days).

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Average UV index in December
South Sumter, SC

Average UV index in December - South Sumter, SC
  • Average UV index in December: 3

The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 3).

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Average cloud cover in December
South Sumter, SC

Average cloud cover in December - South Sumter, SC
  • Average cloud cover in December: 42

The months with the most cloud cover are February and December (Cloud cover 42).
The month with the least cloud cover is October (Cloud cover 29).

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Average visibility in December
South Sumter, SC

Average visibility in December - South Sumter, 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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South Sumter, South Carolina, USA

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