Here's what worked for me:
The first winter, I told people, 'I don't know when I will be back. Maybe a couple weeks, or a couple months, or longer.' Turned out, I was gone 6 months. I kept everyone posted, online and by phone.
The second year, I knew what to expect, so I could make a more definite plan. I cleaned out my house, got rid of a lot and stored the rest, and rented out my house for 9 month stretch. Having the rental income is awesome!
I love my house, so I don't plan to sell it. I also love my stuff ;). And my hometown peeps. I think I will stick with the 6-9 months thing, for now.