The highest day temperature in December 2025 was 44°F. The lowest night temperature was 3°F. The average values for day and night temperatures during December were 32.0°F и 28.3°F respectivly.

The average sea surface temperature in December 2025 for Ketchikan was 43.8°F. The maximum and minimum values were 42.4°F and 44.6°F respectively.

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

Precipitation total in December for Ketchikan is 3.3 in.

The average wind speed in December is 11.0 mph. It makes December one of the most windy months of the year for Ketchikan.

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 Ketchikan in December is 1.7 hours.