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
The onset of December entails a subtle temperature shift, as the average high-temperature eases from a comfortable 63.9°F (17.7°C) in November to a still refreshing 55.8°F (13.2°C). Nighttime temperature lowers to an average of 41.2°F (5.1°C) in December.Humidity
The average relative humidity in December is 79%.Rainfall
In Jefferson, in December, it is raining for 12.1 days, with typically 3.5" (89mm) of accumulated precipitation. Throughout the year, there are 155.6 rainfall days, and 35.79" (909mm) of precipitation is accumulated.Snowfall
April through December are months without snowfall.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 7:02 am and sunset at 5:11 pm. On the last day of December, in Jefferson, sunrise is at 7:19 am and sunset at 5:21 pm CST.
Sunshine
December has the least sunshine of the year, with an average of 5.1h of sunshine.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: In December, a daily UV index of 3 turns into the following recommendations:
Guard yourself - An obligation to protect skin and eyes from harm exists. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. 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 aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in December?
What is the average humidity in December?
How much does it rain in December?
When it does not snow?
Does it snow 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?
What is the month with the least sunshine?
How many hours of sunshine does Jefferson have in December?
When is the lowest UV index?
How high is the UV index in December?
Average temperature in December
Jefferson, TX
- Average high temperature in December: 55.8°F
The warmest month (with the highest average high temperature) is July (94.8°F).
The month with the lowest average high temperature is January (54°F).
- Average low temperature in December: 41.2°F
The months with the highest average low temperature are July and August (73°F).
The coldest month (with the lowest average low temperature) is January (37.9°F).
Average pressure in December
Jefferson, TX
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Jefferson, TX
- Average wind speed in December: 6.1mph
The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in December
Jefferson, TX
- Average humidity in December: 79%
The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is August (67%).
Average rainfall in December
Jefferson, TX
- Average rainfall in December: 3.5"
The wettest month (with the highest rainfall) is April (4.41").
The driest month (with the least rainfall) is September (2.05").
Average rainfall days in December
Jefferson, TX
- Average rainfall days in December: 12.1 days
The month with the highest number of rainy days is August (14.8 days).
The month with the least rainy days is January (10.3 days).
Average snowfall in December
Jefferson, TX
- Average snowfall in December: 0"
The month with the highest snowfall is February (0.63").
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0").
Average snowfall days in December
Jefferson, TX
- Average snowfall days in December: 0.3 days
The month with the highest number of snowfall days is February (1.1 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, TX
- 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 1min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).
Average sunshine days in December
Jefferson, TX
- Average sunshine days in December: 16.8 days
The month with the most sunshine days is October (18.9 days).
The month with the least sunshine days is February (12.8 days).
Average UV index in December
Jefferson, TX
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in December
Jefferson, TX
- Average cloud cover in December: 46
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in December
Jefferson, TX
- Average visibility in December: 6mi
The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is February (5mi).
Jefferson, Texas, USA
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