Originally Posted by Kaul
From the map you posted, Juneau falls right into the green Do zone.
Ya technically Juneau is a borderline maritime climate just like the rest of SE Alaska and British Columbia, and Washington coast.
That being said it does not matter because it is only a narrow sliver of land that goes one or two miles inland before it hits high mountains. The map posted above does not do it justice because within a few miles inland the mountains rise pretty sharply and the climate transitions into a much colder alpine climate.
For those on the east coast who have never visited SE Alaska it is harder to appreciate how rapidly the climate changes on the Northwest coast of North America. In the middle of April You can literally go from 7 degrees Celsius (45 degrees) and raining to -4 C (25 degrees) with 10 feet of snow on the ground within a few miles from the coast line.