December weather forecast
Fort Mill, SC

Weather in December

The first month of the winter, December, is still a cool month in Fort Mill, South Carolina, with an average temperature fluctuating between 39°F (3.9°C) and 53.1°F (11.7°C).

Temperature

In December, the average high-temperature marginally drops from a mild 59.9°F (15.5°C) in November to a cool 53.1°F (11.7°C). The average low-temperature, in Fort Mill, South Carolina, is 39°F (3.9°C).

Humidity

The most humid month in Fort Mill, South Carolina, is December, with an average relative humidity of 75%.

Rainfall

In Fort Mill, South Carolina, it is raining for 10 days, with typically 2.91" (74mm) of accumulated precipitation. In Fort Mill, during the entire year, the rain falls for 146.1 days and collects up to 28.94" (735mm) of precipitation.

Snowfall

January through March and December are months with snowfall in Fort Mill. December is the first month it typically snows. Throughout December, in the average 0.5 snowfall days, it receives 0.83" (21mm) of snow. Throughout the year, there are 3.1 snowfall days, and 3.58" (91mm) of snow is accumulated.

Daylight

With an average of 9h and 51min of daylight, December has the shortest days of the year.
On the first day of December in Fort Mill, sunrise is at 7:13 am and sunset at 5:12 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 5:22 pm EST.

Sunshine

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

UV index

The months with the lowest UV index are January and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in December in Fort Mill?

In Fort Mill, South Carolina, in December, the average high-temperature is 53.1°F (11.7°C), and the average low-temperature is 39°F (3.9°C). in September, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines relative humidity and air temperature, is appraised at 89.6°F (32°C).

What is the most humid month in Fort Mill?

The most humid month in Fort Mill, South Carolina, is December, with an average relative humidity of 75%.

What is the average humidity in December in Fort Mill?

In Fort Mill, the average relative humidity in December is 75%.

How many days does it rain in December in Fort Mill?

In Fort Mill, in December, during 10 rainfall days, 2.91" (74mm) of precipitation is typically accumulated.

When does it start snowing in Fort Mill?

December is the first month it typically snows in Fort Mill, South Carolina. Throughout December, in the average 0.5 snowfall days, it receives 0.83" (21mm) of snow.

What is the month with the shortest days in Fort Mill?

The month with the shortest days in Fort Mill is December, with an average of 9h and 51min of daylight.

What is the average length of the day in December in Fort Mill?

The average day length in December in Fort Mill, South Carolina, is 9h and 51min.

When is the sunrise / sunset in December in Fort Mill?

On the first day of December in Fort Mill, South Carolina, sunrise is at 7:13 am and sunset at 5:12 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 5:22 pm EST.

What is the month with the least sunshine in Fort Mill?

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

How long on average sun shines in December in Fort Mill?

The average sunshine duration in December in Fort Mill is 5.3h.

What is the month with the lowest UV index in Fort Mill?

The months with the lowest UV index are January and December, with an average maximum UV index of 2.

How high is the UV index in December in Fort Mill?

The average daily maximum UV index in December in Fort Mill, South Carolina, is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Fort Mill, SC

Average temperature in December - Fort Mill, SC
  • Average high temperature in December: 53.1°F

The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (49.6°F).

  • Average low temperature in December: 39°F

The month with the highest average low temperature is July (70.7°F).
The coldest month (with the lowest average low temperature) is January (34.3°F).

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Average pressure in December
Fort Mill, SC

Average pressure in December - Fort Mill, SC
  • Average pressure in December: 30.14"Hg

The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).

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Average wind speed in December
Fort Mill, SC

Average wind speed in December - Fort Mill, SC
  • Average wind speed in December: 6.8mph

The windiest months (with the highest average wind speed) are February and April (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

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Average humidity in December
Fort Mill, SC

Average humidity in December - Fort Mill, SC
  • Average humidity in December: 75%

The month with the highest relative humidity is December (75%).
The month with the lowest relative humidity is July (69%).

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Average rainfall in December
Fort Mill, SC

Average rainfall in December - Fort Mill, SC
  • Average rainfall in December: 2.91"

The wettest month (with the highest rainfall) is August (3.23").
The driest months (with the least rainfall) are September and October (1.81").

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Average rainfall days in December
Fort Mill, SC

Average rainfall days in December - Fort Mill, SC
  • Average rainfall days in December: 10 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is November (8.3 days).

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Average snowfall in December
Fort Mill, SC

Average snowfall in December - Fort Mill, SC
  • Average snowfall in December: 0.83"

The month with the highest snowfall is February (1.26").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

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Average snowfall days in December
Fort Mill, SC

Average snowfall days in December - Fort Mill, SC
  • Average snowfall days in December: 0.5 days

The month with the highest number of snowfall days is February (1.4 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

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Average daylight in December /
Average sunshine in December
Fort Mill, SC

Average daylight in December / Average sunshine in December - Fort Mill, SC
  • Average daylight in December: 9h and 51min

The month with the longest days is June (Average daylight: 14h and 28min).
The month with the shortest days is December (Average daylight: 9h and 51min).

  • Average sunshine in December: 5h and 18min

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
Fort Mill, SC

Average sunshine days in December - Fort Mill, SC
  • Average sunshine days in December: 19.8 days

The month with the most sunshine days is October (22 days).
The month with the least sunshine days is July (11.8 days).

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Average UV index in December
Fort Mill, SC

Average UV index in December - Fort Mill, SC
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and December (UV index 2).

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Average cloud cover in December
Fort Mill, SC

Average cloud cover in December - Fort Mill, SC
  • Average cloud cover in December: 44

The months with the most cloud cover are February and December (Cloud cover 44).
The month with the least cloud cover is June (Cloud cover 30).

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Average visibility in December
Fort Mill, SC

Average visibility in December - Fort Mill, 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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