December weather forecastWilliston, SC
December
Weather in December
The first month of the winter, December, is also a moderate month in Williston, South Carolina, with an average temperature varying between 57.2°F (14°C) and 43.2°F (6.2°C).Temperature
The move into December indicates a slight reduction in the average high-temperature, down from November's comfortable 63.3°F (17.4°C) to a moderate 57.2°F (14°C). Williston observes an average nighttime low-temperature of 43.2°F (6.2°C) during the month of December.Humidity
With an average relative humidity of 75%, December is the most humid month.Rainfall
December is the month with the most rainfall. Rain falls for 11.1 days and accumulates 3.35" (85mm) of precipitation.Snowfall
Months with snowfall are January, February and December. December is the first month it typically snows in Williston. Throughout December, in the average 0.2 snowfall days, it receives 0.12" (3mm) of snow. Throughout the year, there are 1.2 snowfall days, and 0.67" (17mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 10h and 0min of daylight.On the first day of the month, sunrise is at 7:12 am and sunset at 5:17 pm. On the last day of December, in Williston, sunrise is at 7:29 am and sunset at 5:28 pm EST.
Sunshine
December has the least sunshine of the year, with an average of 5.4h of sunshine.UV index
January and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: A maximum daily UV index of 3 during December morphs into the following directions:
Undertake protective steps - Preventing sun damage is advised. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Williston, SC
- Average high temperature in December: 57.2°F
The warmest month (with the highest average high temperature) is July (90.5°F).
The month with the lowest average high temperature is January (54°F).
- Average low temperature in December: 43.2°F
The month with the highest average low temperature is July (73.4°F).
The coldest month (with the lowest average low temperature) is January (38.8°F).
Average pressure in December
Williston, 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
Williston, SC
- Average wind speed in December: 7.6mph
The windiest months (with the highest average wind speed) are February, March and April (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity in December
Williston, 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
Williston, SC
- Average rainfall in December: 3.35"
The wettest month (with the highest rainfall) is December (3.35").
The driest month (with the least rainfall) is November (1.77").
Average rainfall days in December
Williston, SC
- Average rainfall days in December: 11.1 days
The month with the highest number of rainy days is July (19 days).
The month with the least rainy days is November (8.2 days).
Average snowfall in December
Williston, SC
- Average snowfall in December: 0.12"
The month with the highest snowfall is January (0.31").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").
Average snowfall days in December
Williston, SC
- Average snowfall days in December: 0.2 days
The month with the highest number of snowfall days is January (0.6 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
Williston, SC
- Average daylight in December: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in December: 5h and 24min
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
Williston, SC
- Average sunshine days in December: 18.1 days
The month with the most sunshine days is October (20.5 days).
The month with the least sunshine days is July (9.4 days).
Average UV index in December
Williston, 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 and December (UV index 3).
Average cloud cover in December
Williston, SC
- Average cloud cover in December: 42
The month with the most cloud cover is December (Cloud cover 42).
The month with the least cloud cover is October (Cloud cover 28).
Average visibility in December
Williston, 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).
