December weather forecast
Port Sulphur, LA

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Weather in December

The first month of the winter, December, is still a refreshing month in Port Sulphur, Louisiana, with temperature in the range of an average low of 56.1°F (13.4°C) and an average high of 64.2°F (17.9°C).

Temperature

Port Sulphur's December showcases an average high-temperature of a refreshing 64.2°F (17.9°C), hardly distinct from November's 69.3°F (20.7°C). Nighttime temperature sees a small decrement from daytime highs, dipping to an average of 56.1°F (13.4°C) during December.

Humidity

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

Rainfall

In Port Sulphur, in December, it is raining for 9.8 days, with typically 1.5" (38mm) of accumulated precipitation. Throughout the year, there are 137.2 rainfall days, and 19.92" (506mm) of precipitation is accumulated.

Snowfall

February through December are months without snowfall.

Daylight

The month with the shortest days in Port Sulphur, Louisiana, is December, with an average of 10h and 18min of daylight.
On the first day of the month, sunrise is at 6:36 am and sunset at 4:59 pm. On the last day of December, sunrise is at 6:53 am and sunset at 5:10 pm CST.

Sunshine

December has the least sunshine of the year, with an average of 5.3h of sunshine.

UV index

January and December, with an average maximum UV index of 4, are months with the lowest UV index. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for average individuals.
Note: A maximum daily UV index of 4 during December morphs into the following directions:
Ensure safety - Imperative it is to shield skin and eyes from damage. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Updated: Jun 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in December?

The high-temperature, in December, in Port Sulphur, records 64.2°F (17.9°C), while the low-temperature is 56.1°F (13.4°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, in September is calculated to be 95°F (35°C).

What is the most humid month?

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

What is the average humidity in December?

In December, the average relative humidity is 78%.

How many days does it rain in December?

In Port Sulphur, in December, during 9.8 rainfall days, 1.5" (38mm) of precipitation is typically accumulated.

When it does not snow?

In Port Sulphur, snow does not fall in February through December.

Does it snow in December?

In Port Sulphur, in December, it doesn't snow. In January, it regularly snows.

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.

What is the average length of the day in December?

The average day length in December is 10h and 17min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 6:36 am and sunset at 4:59 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 5:10 pm CST.

What is the month with the least sunshine?

December has the least sunshine of the year in Port Sulphur, with an average of 5.3h of sunshine.

How many hours of sunshine does Port Sulphur have in December?

In Port Sulphur, the average sunshine duration in December is 5.3h.

What are the months with the lowest UV index?

The months with the lowest UV index are January and December, with an average maximum UV index of 4.

What is the UV index intensity in December?

In December, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Port Sulphur, LA

Average temperature in December - Port Sulphur, LA
  • Average high temperature in December: 64.2°F

The warmest month (with the highest average high temperature) is August (87.6°F).
The month with the lowest average high temperature is January (61.2°F).

  • Average low temperature in December: 56.1°F

The month with the highest average low temperature is August (80.4°F).
The coldest month (with the lowest average low temperature) is January (51.6°F).

Average pressure in December
Port Sulphur, LA

Average pressure in December - Port Sulphur, LA
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.97"Hg).

Average wind speed in December
Port Sulphur, LA

Average wind speed in December - Port Sulphur, LA
  • Average wind speed in December: 11.2mph

The windiest month (with the highest average wind speed) is January (11.3mph).
The calmest month (with the lowest average wind speed) is July (7.3mph).

Average humidity in December
Port Sulphur, LA

Average humidity in December - Port Sulphur, 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 (70%).

Average rainfall in December
Port Sulphur, LA

Average rainfall in December - Port Sulphur, LA
  • Average rainfall in December: 1.5"

The wettest month (with the highest rainfall) is August (4.72").
The driest month (with the least rainfall) is April (0.79").

Average rainfall days in December
Port Sulphur, LA

Average rainfall days in December - Port Sulphur, LA
  • Average rainfall days in December: 9.8 days

The month with the highest number of rainy days is August (20.3 days).
The month with the least rainy days is November (7 days).

Average snowfall days in December
Port Sulphur, LA

Average snowfall days in December - Port Sulphur, LA
  • Average snowfall days in December: 0 days

The month with the highest number of snowfall days is January (0.2 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).

Average daylight in December /
Average sunshine in December
Port Sulphur, LA

Average daylight in December / Average sunshine in December - Port Sulphur, 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 2min

The month with the most sunshine is June (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).

Average sunshine days in December
Port Sulphur, LA

Average sunshine days in December - Port Sulphur, LA
  • Average sunshine days in December: 18.2 days

The months with the most sunshine days are April and November (20.9 days).
The month with the least sunshine days is August (7.3 days).

Average UV index in December
Port Sulphur, LA

Average UV index in December - Port Sulphur, LA
  • Average UV index in December: 4

The months with the highest UV index are May, June, July, August and September (UV index 7).
The months with the lowest UV index are January and December (UV index 4).

Average cloud cover in December
Port Sulphur, LA

Average cloud cover in December - Port Sulphur, LA
  • Average cloud cover in December: 43

The month with the most cloud cover is December (Cloud cover 43).
The month with the least cloud cover is May (Cloud cover 23).

Average visibility in December
Port Sulphur, LA

Average visibility in December - Port Sulphur, 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).

Port Sulphur, Louisiana, USA

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