December weather forecast
Jefferson, LA

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Weather in December

December, the first month of the winter in Jefferson, is still a comfortable month, with temperature in the range of an average low of 52°F (11.1°C) and an average high of 63.3°F (17.4°C).

Temperature

With the onset of December, Jefferson's average high-temperature slightly adjusts, moderately receding from November's pleasant 68.9°F (20.5°C) to a comfortable 63.3°F (17.4°C). Throughout the month of December, Jefferson witnesses an average low-temperature of 52°F (11.1°C).

Humidity

December is the most humid month, with an average relative humidity of 78%.

Rainfall

In Jefferson, during December, the rain falls for 7.2 days and regularly aggregates up to 0.71" (18mm) of precipitation. Throughout the year, there are 104.1 rainfall days, and 8.39" (213mm) of precipitation is accumulated.

Daylight

With an average of 10h and 18min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 6:39 am and sunset at 5:00 pm. On the last day of December, sunrise is at 6:56 am and sunset at 5:11 pm CST.

Sunshine

December has the least sunshine of the year, with an average of 5.1h of sunshine.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the average person.
Note: In December, the maximum UV index of 3 transforms into these recommendations:
Be vigilant - Preventing sunburn is recommended. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
Updated: Aug 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Jefferson in December?

The high-temperature, in December, in Jefferson, is 63.3°F (17.4°C), while the low-temperature averages to 52°F (11.1°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in September is computed to be 98.6°F (37°C).

What is the most humid month?

With an average relative humidity of 78%, December is the most humid month.

What is the average humidity in December?

In December, the average relative humidity is 78%.

How many days does it rain in December in Jefferson?

In December, the rain falls for 7.2 days. Throughout December, 0.71" (18mm) of precipitation is accumulated.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 10h and 18min of daylight.

How many hours of daylight does Jefferson have in December?

The average day length in December is 10h and 16min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 6:39 am and sunset at 5:00 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 5:11 pm CST.

What is the month with the least sunshine?

December has the least sunshine of the year, with an average of 5.1h of sunshine.

How many hours of sunshine does Jefferson have in December?

The average sunshine duration in December is 5.1h.

When is the lowest UV index?

The month with the lowest UV index in Jefferson is December, with an average maximum UV index of 3.

How high is the UV index in December?

In December, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a medium health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Jefferson, LA

Average temperature in December - Jefferson, LA
  • Average high temperature in December: 63.3°F

The warmest month (with the highest average high temperature) is July (89.2°F).
The month with the lowest average high temperature is January (60.4°F).

  • Average low temperature in December: 52°F

The month with the highest average low temperature is August (79°F).
The coldest month (with the lowest average low temperature) is January (47.8°F).

Average pressure in December
Jefferson, LA

Average pressure in December - Jefferson, LA
  • Average pressure in December: 30.12"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.97"Hg).

Average wind speed in December
Jefferson, LA

Average wind speed in December - Jefferson, LA
  • Average wind speed in December: 9.3mph

The windiest months (with the highest average wind speed) are February and April (9.5mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).

Average humidity in December
Jefferson, LA

Average humidity in December - Jefferson, LA
  • Average humidity in December: 78%

The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Jefferson, LA

Average rainfall in December - Jefferson, LA
  • Average rainfall in December: 0.71"

The wettest month (with the highest rainfall) is July (1.3").
The driest month (with the least rainfall) is March (0.39").

Average rainfall days in December
Jefferson, LA

Average rainfall days in December - Jefferson, LA
  • Average rainfall days in December: 7.2 days

The month with the highest number of rainy days is August (14.8 days).
The month with the least rainy days is November (4.5 days).

Average daylight in December /
Average sunshine in December
Jefferson, LA

Average daylight in December / Average sunshine in December - Jefferson, LA
  • Average daylight in December: 10h and 2min

The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).

  • Average sunshine in December: 5h and 1min

The month with the most sunshine is June (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).

Average sunshine days in December
Jefferson, LA

Average sunshine days in December - Jefferson, LA
  • Average sunshine days in December: 21.8 days

The month with the most sunshine days is November (24.6 days).
The month with the least sunshine days is August (10.3 days).

Average UV index in December
Jefferson, LA

Average UV index in December - Jefferson, LA
  • Average UV index in December: 3

The months with the highest UV index are May, June, July, August and September (UV index 7).
The month with the lowest UV index is December (UV index 3).

Average cloud cover in December
Jefferson, LA

Average cloud cover in December - Jefferson, LA
  • Average cloud cover in December: 45

The month with the most cloud cover is December (Cloud cover 45).
The month with the least cloud cover is October (Cloud cover 24).

Average visibility in December
Jefferson, LA

Average visibility in December - Jefferson, LA
  • 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, Louisiana, USA

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