December weather forecastLancaster, SC
December
Weather in December
By the time December arrives, Lancaster witnesses winter in full swing with the lowest average temperatures of the year. Barring January and February, this month sees the reappearance of snowfall. A constant wind speed combined with increased humidity levels exacerbates the winter chill. Despite the shorter daylight hours, cloud coverage is at its highest, further lessening the sunlight exposure. The temperature spectrum for December extends from 39.7°F (4.3°C) to 54.1°F (12.3°C), rounding off the year with a cold close.Temperature
December is marked by a subtle drop in average high-temperatures, transitioning from a mild 60.4°F (15.8°C) in November to a cool 54.1°F (12.3°C). In the month of December, an average of 39.7°F (4.3°C) marks the low-temperature.Humidity
May and December, with an average relative humidity of 75%, are the most humid months.Rainfall
In December, the rain falls for 8.5 days. Throughout December, 1.02" (26mm) of precipitation is accumulated. In Lancaster, during the entire year, the rain falls for 120.6 days and collects up to 11.97" (304mm) of precipitation.Snowfall
In Lancaster, snow does not fall in March through December.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 7:12 am and sunset at 5:12 pm. On the last day of December, in Lancaster, South Carolina, sunrise is at 7:30 am and sunset at 5:22 pm EST.
Sunshine
With an average of 5.5h of sunshine, December has the least sunshine of the year.UV index
In December, the average daily maximum UV index in Lancaster is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In December, the maximum UV index of 3 translates into these guidelines:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Lancaster, SC
- Average high temperature in December: 54.1°F
The warmest month (with the highest average high temperature) is July (90.3°F).
The month with the lowest average high temperature is January (49.8°F).
- Average low temperature in December: 39.7°F
The month with the highest average low temperature is July (71.2°F).
The coldest month (with the lowest average low temperature) is January (35.2°F).
Average pressure in December
Lancaster, 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 (29.97"Hg).
Average wind speed in December
Lancaster, SC
- Average wind speed in December: 6.9mph
The windiest months (with the highest average wind speed) are February and April (8mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Lancaster, 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
Lancaster, SC
- Average rainfall in December: 1.02"
The wettest month (with the highest rainfall) is August (1.61").
The driest month (with the least rainfall) is September (0.51").
Average rainfall days in December
Lancaster, SC
- Average rainfall days in December: 8.5 days
The month with the highest number of rainy days is July (14.9 days).
The month with the least rainy days is November (5.9 days).
Average snowfall in December
Lancaster, SC
- Average snowfall in December: 0"
The month with the highest snowfall is February (0.12").
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in December
Lancaster, SC
- Average snowfall days in December: 0.1 days
The month with the highest number of snowfall days is February (0.5 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
Lancaster, SC
- Average daylight in December: 9h and 54min
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 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
Lancaster, SC
- Average sunshine days in December: 20.6 days
The month with the most sunshine days is October (23.5 days).
The month with the least sunshine days is July (12.9 days).
Average UV index in December
Lancaster, 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
Lancaster, SC
- Average cloud cover in December: 41
The month with the most cloud cover is February (Cloud cover 42).
The month with the least cloud cover is June (Cloud cover 28).
Average visibility in December
Lancaster, 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).
