December weather forecast
Mandeville, LA

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Weather in December

Wrapping up the year in Mandeville, Louisiana, December sees temperatures dropping further from 48.9°F (9.4°C) to 61.9°F (16.6°C), hinting at the arrival of the nearing Winter. Coinciding with the Winter Solstice, daylight hours reach their shortest at an average of 10.2 hours per day. With lowest UV indices and considerable cloud cover, it suggests a decided inclination towards inclement weather. Average rainfall increases to 3.94" (100mm) and could include an occasional snowfall every couple of years. The dominant chill of December and the anticipation of snowfall add a festive aura to the city's climate.

Temperature

The arrival of December correlates with a minor temperature reduction, down from November's agreeable 68.4°F (20.2°C) to an enjoyable 61.9°F (16.6°C). During the December nights, an average temperature of 48.9°F (9.4°C) is observed.

Humidity

The most humid month is December, with an average relative humidity of 79%.

Rainfall

In Mandeville, during December, the rain falls for 14.3 days and regularly aggregates up to 3.94" (100mm) of precipitation. In Mandeville, during the entire year, the rain falls for 183.7 days and collects up to 43.94" (1116mm) of precipitation.

Snowfall

In Mandeville, Louisiana, snow does not fall in February through December.

Ocean temperature

In Mandeville, the average seawater temperature in December is 60.4°F (15.8°C).
Note: For most individuals, swimming in 60.4°F (15.8°C) is not a pleasant experience. The difficulty in managing breathing increases as the temperature decreases from 69.8°F (21°C) to 59°F (15°C).

Daylight

With an average of 10h and 12min 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 4:59 pm. On the last day of December, sunrise is at 6:56 am and sunset at 5:10 pm CST.

Sunshine

The month with the least sunshine is December, with an average of 5.1h of sunshine.

UV index

December is the month with the lowest UV index, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: In December, a daily maximum UV index of 3 leads to the following instructions:
Guard yourself - Precautionary measures against sun damage are advocated. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.

Frequently asked questions

What are December temperatures?

The high-temperature, in December, in Mandeville, is 61.9°F (16.6°C), while the low-temperature averages to 48.9°F (9.4°C). In September, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines air temperature and relative humidity, is appraised at 102.2°F (39°C).

What is the most humid month?

With an average relative humidity of 79%, December is the most humid month.

What is the average humidity in December?

In December, the average relative humidity is 79%.

How much does it rain in December?

In Mandeville, in December, it is raining for 14.3 days, with typically 3.94" (100mm) of accumulated precipitation.

When it does not snow?

February through December are months without snowfall.

Does it snow in December?

In Mandeville, Louisiana, in December, it doesn't snow. In January, it regularly snows.

What is the ocean temperature in December in Mandeville?

In Mandeville, the average seawater temperature in December is 60.4°F (15.8°C). Swimming in 60.4°F (15.8°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

What is the month with the shortest days?

The month with the shortest days is December, with an average of 10h and 12min of daylight.

What is the average length of the day in December?

In December, the average day length is 10h and 14min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 6:39 am and sunset at 4:59 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 5:10 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 Mandeville have in December?

In December, the average sunshine duration is 5.1h.

What is the month with the lowest UV index in Mandeville?

With an average maximum UV index of 3, December is the month with the lowest UV index.

What is the UV index reading in December?

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

Average temperature in December
Mandeville, LA

Average temperature in December - Mandeville, LA
  • Average high temperature in December: 61.9°F

The warmest month (with the highest average high temperature) is August (91°F).
The month with the lowest average high temperature is January (59.2°F).

  • Average low temperature in December: 48.9°F

The months with the highest average low temperature are July and August (76.8°F).
The coldest month (with the lowest average low temperature) is January (44.8°F).

Average pressure in December
Mandeville, LA

Average pressure in December - Mandeville, LA
  • Average pressure in December: 30.13"Hg

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

Average wind speed in December
Mandeville, LA

Average wind speed in December - Mandeville, LA
  • Average wind speed in December: 7.3mph

The windiest month (with the highest average wind speed) is April (8mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

Average humidity in December
Mandeville, LA

Average humidity in December - Mandeville, LA
  • Average humidity in December: 79%

The month with the highest relative humidity is December (79%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Mandeville, LA

Average rainfall in December - Mandeville, LA
  • Average rainfall in December: 3.94"

The wettest month (with the highest rainfall) is August (6.73").
The driest month (with the least rainfall) is November (1.93").

Average rainfall days in December
Mandeville, LA

Average rainfall days in December - Mandeville, LA
  • Average rainfall days in December: 14.3 days

The month with the highest number of rainy days is August (23.8 days).
The month with the least rainy days is November (8.2 days).

Average snowfall in December
Mandeville, LA

Average snowfall in December - Mandeville, LA
  • Average snowfall in December: 0"

The month with the highest snowfall is January (0.08").
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").

Average snowfall days in December
Mandeville, LA

Average snowfall days in December - Mandeville, LA
  • Average snowfall days in December: 0.1 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 and November (0 days).

Average sea temperature in December
Mandeville, LA

Average sea temperature in December - Mandeville, LA
  • Average sea temperature in December: 60.3°F

The best month for swimming (with the highest average sea temperature) is August (86.4°F).
The coldest month (with the lowest average sea temperature) is January (56.6°F).

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

Average daylight in December / Average sunshine in December - Mandeville, LA
  • Average daylight in December: 10h and 1min

The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).

  • 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
Mandeville, LA

Average sunshine days in December - Mandeville, LA
  • Average sunshine days in December: 15.4 days

The month with the most sunshine days is November (19.8 days).
The month with the least sunshine days is August (5.6 days).

Average UV index in December
Mandeville, LA

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

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

Average cloud cover in December
Mandeville, LA

Average cloud cover in December - Mandeville, LA
  • Average cloud cover in December: 46

The month with the most cloud cover is December (Cloud cover 46).
The month with the least cloud cover is October (Cloud cover 24).

Average visibility in December
Mandeville, LA

Average visibility in December - Mandeville, 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).

Mandeville, Louisiana, USA

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