Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December brings a slight decrease in temperature, down from a moderate 60.4°F (15.8°C) in November to a fresh 54.3°F (12.4°C). Jefferson experiences an average low-temperature of 40.1°F (4.5°C) in month of December.Humidity
The months with the highest humidity in Jefferson are May and December, with an average relative humidity of 75%.Rainfall
In Jefferson, during December, the rain falls for 11.8 days and regularly aggregates up to 3.43" (87mm) of precipitation. In Jefferson, during the entire year, the rain falls for 166.4 days and collects up to 33.7" (856mm) of precipitation.Snowfall
Months with snowfall are January through March, November and December. In Jefferson, South Carolina, during December, snow falls for 0.4 days and regularly aggregates up to 0.35" (9mm) of snow. In Jefferson, South Carolina, during the entire year, snow falls for 3.8 days and aggregates up to 2.8" (71mm) of snow.Daylight
With an average of 9h and 54min of daylight, December has the shortest days of the year in Jefferson.On the first day of the month, sunrise is at 7:10 am and sunset at 5:10 pm. On the last day of December, in Jefferson, South Carolina, sunrise is at 7:28 am and sunset at 5:21 pm EST.
Sunshine
With an average of 5.5h of sunshine, December has the least sunshine of the year.UV index
The average daily maximum UV index in December is 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: The daily high UV index of 3 in December translates into this advice:
Be vigilant - A duty to shield skin and eyes from injury exists. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in December in Jefferson?
What is the most humid month in Jefferson?
What is the average humidity in December in Jefferson?
How many days does it rain in December in Jefferson?
How much does it snow in Jefferson in December?
What is the month with the shortest days in Jefferson?
How many hours of daylight does Jefferson have in December?
When are sunrise and sunset in December in Jefferson?
What is the month with the least sunshine in Jefferson?
How long on average sun shines in December in Jefferson?
What is the UV index intensity in December in Jefferson?
Average temperature in December
Jefferson, SC
- Average high temperature in December: 54.3°F
The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is January (50.2°F).
- Average low temperature in December: 40.1°F
The month with the highest average low temperature is July (72°F).
The coldest month (with the lowest average low temperature) is January (35.2°F).
Average pressure in December
Jefferson, 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
Jefferson, SC
- Average wind speed in December: 6.9mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in December
Jefferson, 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 January, March, July and November (71%).
Average rainfall in December
Jefferson, SC
- Average rainfall in December: 3.43"
The wettest month (with the highest rainfall) is August (3.54").
The driest month (with the least rainfall) is October (2.17").
Average rainfall days in December
Jefferson, SC
- Average rainfall days in December: 11.8 days
The month with the highest number of rainy days is July (19 days).
The month with the least rainy days is October (9.5 days).
Average snowfall in December
Jefferson, SC
- Average snowfall in December: 0.35"
The month with the highest snowfall is February (1.34").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Jefferson, SC
- Average snowfall days in December: 0.4 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 and October (0 days).
Average daylight in December /
Average sunshine in December
Jefferson, 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 3min
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
Jefferson, SC
- Average sunshine days in December: 17.4 days
The month with the most sunshine days is October (20.4 days).
The month with the least sunshine days is July (9.7 days).
Average UV index in December
Jefferson, 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
Jefferson, SC
- Average cloud cover in December: 41
The months with the most cloud cover are February, March and December (Cloud cover 41).
The month with the least cloud cover is June (Cloud cover 28).
Average visibility in December
Jefferson, 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).
Jefferson, South Carolina, USA
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