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 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 aligns with a soft reduction in the average high-temperature, gently falling from a pleasant 68.9°F (20.5°C) in November to a comfortable 63.5°F (17.5°C). Gretna experiences an average low-temperature reading of 52.5°F (11.4°C) throughout December.Humidity
The months with the highest humidity are February and December, with an average relative humidity of 77%.Rainfall
In Gretna, in December, it is raining for 7.8 days, with typically 0.79" (20mm) of accumulated precipitation. Throughout the year, there are 112.1 rainfall days, and 9.37" (238mm) of precipitation is accumulated.Snowfall
February through December are months without snowfall.Daylight
With an average of 10h and 18min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 6:38 am and sunset at 5:00 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 5:11 pm CST.
Sunshine
With an average of 5.1h of sunshine, December has the least sunshine of the year.UV index
With an average maximum UV index of 3, December is the month with the lowest UV index. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index, 3 in December, converts into the following recommendations:
Ensure safety - Imperative it is to shield skin and eyes from damage. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in December?
What is the most humid month?
What is the average humidity in December?
How much does it rain in December?
When it does not snow in Gretna?
Does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Gretna have in December?
When is the sunrise / sunset in December?
What is the month with the least sunshine in Gretna?
How long on average sun shines in December?
When is the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Gretna, LA
- Average high temperature in December: 63.5°F
The warmest months (with the highest average high temperature) are July and August (89.4°F).
The month with the lowest average high temperature is January (60.4°F).
- Average low temperature in December: 52.5°F
The month with the highest average low temperature is August (79.5°F).
The coldest month (with the lowest average low temperature) is January (48.6°F).
Average pressure in December
Gretna, 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
Gretna, LA
- Average wind speed in December: 9.4mph
The windiest months (with the highest average wind speed) are February and April (9.8mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).
Average humidity in December
Gretna, LA
- Average humidity in December: 77%
The months with the highest relative humidity are February and December (77%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Gretna, LA
- Average rainfall in December: 0.79"
The wettest month (with the highest rainfall) is July (1.57").
The driest months (with the least rainfall) are March and April (0.43").
Average rainfall days in December
Gretna, LA
- Average rainfall days in December: 7.8 days
The month with the highest number of rainy days is August (17.2 days).
The month with the least rainy days is November (4.7 days).
Average snowfall days in December
Gretna, LA
- Average snowfall days in December: 0 days
The month with the highest number of snowfall days is January (0.1 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
Gretna, 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
Gretna, LA
- Average sunshine days in December: 21.6 days
The month with the most sunshine days is November (23.5 days).
The month with the least sunshine days is August (8.9 days).
Average UV index in December
Gretna, 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
Gretna, LA
- Average cloud cover in December: 44
The month with the most cloud cover is December (Cloud cover 44).
The month with the least cloud cover is October (Cloud cover 24).
Average visibility in December
Gretna, 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).
Gretna, Louisiana, USA
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