December weather forecast
Rion, SC

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Weather in December

The first month of the winter, December, is also a fresh month in Rion, South Carolina, with temperature in the range of an average high of 54.9°F (12.7°C) and an average low of 40.6°F (4.8°C).

Temperature

The arrival of December is marked by a minor reduction in average high-temperature, sliding from a refreshing 61.7°F (16.5°C) in November to a cool 54.9°F (12.7°C). Throughout December nights, Rion experiences a consistent temperature average of 40.6°F (4.8°C).

Humidity

The months with the highest humidity are May and December, with an average relative humidity of 75%.

Rainfall

December is the month with the most rainfall. Rain falls for 12 days and accumulates 3.5" (89mm) of precipitation.

Snowfall

January through March, November and December are months with snowfall in Rion, South Carolina. In Rion, during December, snow falls for 0.2 days and regularly aggregates up to 0.08" (2mm) of snow. In Rion, during the entire year, snow falls for 2.5 days and aggregates up to 1.34" (34mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 54min of daylight.
On the first day of the month, sunrise is at 7:13 am and sunset at 5:14 pm. On the last day of December, sunrise is at 7:30 am and sunset at 5:25 pm EST.

Sunshine

With an average of 5.4h of sunshine, December has the least sunshine of the year.

UV index

In December, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: A daily high UV index of 3 in December leads to these guidelines:
Heed the precautions - Suggestions to avoid sunburn are made. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.

Frequently asked questions

What is the usual temperature for Rion in December?

Rion in December has an average high-temperature of 54.9°F (12.7°C) and an average low-temperature of 40.6°F (4.8°C). In September, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, is computed to be 91.4°F (33°C).

What is the most humid month?

The months with the highest humidity are May and December, with an average relative humidity of 75%.

What is the average humidity in December?

The average relative humidity in December is 75%.

What is the wettest month?

The month with the most rainfall is December, when the rain falls for 12 days and typically aggregates up to 3.5" (89mm) of precipitation.

How much does it rain in December?

In Rion, in December, it is raining for 12 days, with typically 3.5" (89mm) of accumulated precipitation.

How much does it snow in December?

In Rion, during December, snow falls for 0.2 days and regularly aggregates up to 0.08" (2mm) of snow.

What is the month with the shortest days?

With an average of 9h and 54min of daylight, December has the shortest days of the year.

What is the average length of the day in December?

In Rion, South Carolina, the average day length in December is 9h and 55min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:13 am and sunset at 5:14 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 5:25 pm EST.

What is the month with the least sunshine?

The month with the least sunshine is December, with an average of 5.4h of sunshine.

How long on average sun shines in December?

The average sunshine duration in December is 5.4h.

What is the UV index intensity in December?

The average daily maximum UV index in December is 3. A UV Index reading of 3 to 5 represents a medium health risk from exposure to the Sun's 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
Rion, SC

Average temperature in December - Rion, SC
  • Average high temperature in December: 54.9°F

The warmest month (with the highest average high temperature) is July (91.6°F).
The month with the lowest average high temperature is January (51.4°F).

  • Average low temperature in December: 40.6°F

The month with the highest average low temperature is July (71.8°F).
The coldest month (with the lowest average low temperature) is January (36.1°F).

Average pressure in December
Rion, SC

Average pressure in December - Rion, 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).

Average wind speed in December
Rion, SC

Average wind speed in December - Rion, SC
  • Average wind speed in December: 7mph

The windiest months (with the highest average wind speed) are February and April (7.9mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity in December
Rion, SC

Average humidity in December - Rion, SC
  • Average humidity in December: 75%

The months with the highest relative humidity are May and December (75%).
The months with the lowest relative humidity are June, July and November (71%).

Average rainfall in December
Rion, SC

Average rainfall in December - Rion, SC
  • Average rainfall in December: 3.5"

The wettest month (with the highest rainfall) is December (3.5").
The driest month (with the least rainfall) is September (1.85").

Average rainfall days in December
Rion, SC

Average rainfall days in December - Rion, SC
  • Average rainfall days in December: 12 days

The month with the highest number of rainy days is July (18 days).
The months with the least rainy days are October and November (9 days).

Average snowfall in December
Rion, SC

Average snowfall in December - Rion, SC
  • Average snowfall in December: 0.08"

The month with the highest snowfall is February (0.83").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in December
Rion, SC

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

The month with the highest number of snowfall days is February (1.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Rion, SC

Average daylight in December / Average sunshine in December - Rion, 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 54min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).

Average sunshine days in December
Rion, SC

Average sunshine days in December - Rion, SC
  • Average sunshine days in December: 17.4 days

The month with the most sunshine days is October (20.9 days).
The month with the least sunshine days is July (10.5 days).

Average UV index in December
Rion, SC

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

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

Average cloud cover in December
Rion, SC

Average cloud cover in December - Rion, 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 June (Cloud cover 28).

Average visibility in December
Rion, SC

Average visibility in December - Rion, 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).

Rion, South Carolina, USA

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