December weather forecastSwansea, SC
December
Weather in December
The first month of the winter, December, is still a mild month in Swansea, South Carolina, with an average temperature ranging between min 42.4°F (5.8°C) and max 57°F (13.9°C).Temperature
December signifies a minor drop in average high-temperature, transitioning from an enjoyable 62.6°F (17°C) in November to a mild 57°F (13.9°C). An average low-temperature of 42.4°F (5.8°C) is anticipated throughout the nights in Swansea during December.Humidity
The most humid month in Swansea is December, with an average relative humidity of 75%.Rainfall
December is the month with the most rainfall. Rain falls for 11.9 days and accumulates 3.86" (98mm) of precipitation.Snowfall
Months with snowfall are January through March and December. December is the first month it typically snows. Throughout December, in the average 0.1 snowfall days, it receives 0.16" (4mm) of snow. Throughout the year, there are 1.6 snowfall days, and 0.83" (21mm) of snow is accumulated.Daylight
With an average of 10h and 0min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:11 am and sunset at 5:15 pm. On the last day of December, in Swansea, sunrise is at 7:29 am and sunset at 5:26 pm EST.
Sunshine
The month with the least sunshine is December, with an average of 5.5h 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 exposure to the Sun's UV rays for the ordinary person.Note: The maximum UV index, 3 during December, leads to the following recommendations:
Heed the precautions - Suggestions to avoid sunburn are made. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Boost your sun resistance with garments that are densely woven yet spacious. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Swansea, SC
- Average high temperature in December: 57°F
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (53.2°F).
- Average low temperature in December: 42.4°F
The month with the highest average low temperature is July (73°F).
The coldest month (with the lowest average low temperature) is January (38.1°F).
Average pressure in December
Swansea, 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
Swansea, SC
- Average wind speed in December: 7.5mph
The windiest months (with the highest average wind speed) are February, March and April (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).
Average humidity in December
Swansea, SC
- Average humidity in December: 75%
The month with the highest relative humidity is December (75%).
The months with the lowest relative humidity are January and November (70%).
Average rainfall in December
Swansea, SC
- Average rainfall in December: 3.86"
The wettest month (with the highest rainfall) is December (3.86").
The driest months (with the least rainfall) are September and November (2.01").
Average rainfall days in December
Swansea, SC
- Average rainfall days in December: 11.9 days
The month with the highest number of rainy days is July (19.9 days).
The months with the least rainy days are October and November (9 days).
Average snowfall in December
Swansea, SC
- Average snowfall in December: 0.16"
The months with the highest snowfall are January and February (0.31").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in December
Swansea, SC
- Average snowfall days in December: 0.1 days
The month with the highest number of snowfall days is January (0.7 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in December /
Average sunshine in December
Swansea, SC
- Average daylight in December: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in December: 5h and 30min
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 30min).
Average sunshine days in December
Swansea, SC
- Average sunshine days in December: 17.3 days
The month with the most sunshine days is October (20.5 days).
The month with the least sunshine days is July (8.4 days).
Average UV index in December
Swansea, 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).
Average cloud cover in December
Swansea, SC
- Average cloud cover in December: 41
The months with the most cloud cover are February and December (Cloud cover 41).
The months with the least cloud cover are June and October (Cloud cover 28).
Average visibility in December
Swansea, 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).
