The highest day temperature in December 2025 was 33°F. The lowest night temperature was -23°F. The average values for day and night temperatures during December were 3.5°F и 0.8°F respectivly.

The average sea surface temperature in December 2025 for Juneau was 39.2°F. The maximum and minimum values were 36.6°F and 41.0°F respectively.

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

Precipitation total in December for Juneau is 4.6 in. It makes december one of the most rainy months of the year.

The average wind speed in December is 7.0 mph. It makes December one of the most windy months of the year for Juneau.

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 Juneau in December is 1.7 hours.