I don't know where you are moving from, but it you have ever suffered from depression the long periods of darkness can create problems. One way to combat this is with light therapy. They didn't know it when I was growing up in Seattle and had bouts of depression every winter, and no one knew why, but put me on medication. My husband was in the Navy when we got married and stationed in San Diego, and I have not had the problem since. Our longest period of over-cast weather is 2 weeks. It can creep up on you, so don't let it get to you.
The rest of the family had no problem with the depressing weather just me.
Your adventure sounds great to me. Not sure what you will encounter but it does sound like it will be an adventure and so have a good time.