The highest day temperature in December 2023 was 73°F. The lowest night temperature was 45°F. The average values for day and night temperatures during December were 62.4°F и 60.2°F respectivly.

The average sea surface temperature in December 2023 for Grand Isle was 66.7°F. The maximum and minimum values were 63.0°F and 70.4°F respectively.

Most of the days in December are cloudy but you can also expect sunny or gloomy days.

Precipitation total in December for Grand Isle is 0.9 in. It makes december the least rainy month of the year.

The average wind speed in December is 11.7 mph.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Grand Isle in December is 5.8 hours.